Green, Daniel; Lawrence, Albion; McGreevy, John; Morrison, David R.; Silverstein, Eva; /SLAC /Stanford U., Phys. Dept.
2007-05-18
We show that string theory on a compact negatively curved manifold, preserving a U(1)b1 winding symmetry, grows at least b1 new effective dimensions as the space shrinks. The winding currents yield a ''D-dual'' description of a Riemann surface of genus h in terms of its 2h dimensional Jacobian torus, perturbed by a closed string tachyon arising as a potential energy term in the worldsheet sigma model. D-branes on such negatively curved manifolds also reveal this structure, with a classical moduli space consisting of a b{sub 1}-torus. In particular, we present an AdS/CFT system which offers a non-perturbative formulation of such supercritical backgrounds. Finally, we discuss generalizations of this new string duality.
Fouling-release Property of Water-filled Porous Elastomers
NASA Astrophysics Data System (ADS)
Xie, Lai-yong; Hong, Fei; He, Chuan-xin; Liu, Jian-hong; Wu, Chi
2012-06-01
Since the fouling-releasing ability of silicone elastomers increased as their modulus decreases, we designed and prepared composites with embedded tiny NaCl crytals that were soluble after their immersion in water, resulting in water-filled porous elastomers. The scanning electron microscope images confirmed such a designed water-filling porous structure. The existence of many micro-drops of water in these specially designed elastomers decreased the shear storage modulus and increased the loss factors. The decrease of shear modulus plays a leading role here and is directly related to a lower critical peeling-off stress of a pseudo-barnacle on them. Therefore, such a novel preparation with cheap salts instead of an expensive silicone provides a better way to make fouling-release paints with a lower modulus, a lower critical peeling-off stress and a better fouling-release property without a significant decrease of the cross-linking density.
Acoustic imaging in a water filled metallic pipe
Kolbe, W.F.; Turko, B.T.; Leskovar, B.
1984-04-01
A method is described for the imaging of the interior of a water filled metallic pipe using acoustical techniques. The apparatus consists of an array of 20 acoustic transducers mounted circumferentially around the pipe. Each transducer is pulsed in sequence, and the echos resulting from bubbles in the interior are digitized and processed by a computer to generate an image. The electronic control and digitizing system and the software processing of the echo signals are described. The performance of the apparatus is illustrated by the imaging of simulated bubbles consisting of thin walled glass spheres suspended in the pipe.
Acoustic Propagation in a Water-Filled Cylindrical Pipe
Sullivan, E J; Candy, J V
2003-06-01
This study was concerned with the physics of the propagation of a tone burst of high frequency sound in a steel water-filled pipe. The choice of the pulse was rather arbitrary, so that this work in no way can be considered as recommending a particular pulse form. However, the MATLAB computer codes developed in this study are general enough to carry out studies of pulses of various forms. Also, it should be pointed out that the codes as written are quite time consuming. A computation of the complete field, including all 5995 modes, requires several hours on a desktop computer. The time required by such computations as these is a direct consequence of the bandwidths, frequencies and sample rates employed. No attempt was made to optimize these codes, and it is assumed that much can be done in this regard.
Ultransonic circumferential waves in empty and water- filled tubes
NASA Astrophysics Data System (ADS)
Li, Xing
Ultrasonic waves propagating in the circumference of elastic isotropic cylindrical shells are theoretically and experimentally studied. Dispersion relations of different circumferential modes, including the SH-type and Lamb-type families, are obtained by solving the wave equations numerically. Asymptotic solutions are also given for the SH-like modes. Various technologies are applied for generating and detecting the circumferential waves. In particular, a new approach is developed for experimental determination of the dispersion of the circumferential waves in cylindrical shells. With a chirp interdigital transducer (IDT) as a broadband transmitter and receiver made on a stainless steel tube coated with piezoelectric film, both the group and phase velocities of the circumferential waves are obtained over a wide frequency range, which covers the most sensitive region of the lowest flexural mode. Other transduction approaches are also used as complementary tools in the experiments. Experiments are carried out on both empty and fluid- loaded cylindrical shells at different frequencies. With the specially developed experimental configuration, propagation of a new flexural wave type in a water-filled tube is observed. Mode conversions are also observed between the A 0 mode in the shell and the compressional waves in the water. The results show good application potentials in liquid level sensing.
Separation of empty and water-filled single-wall carbon nanotubes.
Fagan, Jeffrey A; Huh, Ji Yeon; Simpson, Jeffrey R; Blackburn, Jeffrey L; Holt, Josh M; Larsen, Brian A; Walker, Angela R Hight
2011-05-24
The separation of empty and water-filled laser ablation and electric arc synthesized nanotubes is reported. Centrifugation of these large-diameter nanotubes dispersed with sodium deoxycholate using specific conditions produces isolated bands of empty and water-filled nanotubes without significant diameter selection. This separation is shown to be consistent across multiple nanotube populations dispersed from different source soots. Detailed spectroscopic characterization of the resulting empty and filled fractions reveals that water filling leads to systematic changes to the optical and vibrational properties. Furthermore, sequential separation of the resolved fractions using cosurfactants and density gradient ultracentrifugation reveals that water filling strongly influences the optimal conditions for metallic and semiconducting separation.
Abelian duality at higher genus
NASA Astrophysics Data System (ADS)
Beasley, Chris
2014-07-01
In three dimensions, a free, periodic scalar field is related by duality to an abelian gauge field. Here I explore aspects of this duality when both theories are quantized on a Riemann surface of genus g. At higher genus, duality involves an identification of winding with momentum on the Jacobian variety of the Riemann surface. I also consider duality for monopole and loop operators on the surface and exhibit the operator algebra, a refinement of the Wilson-'t Hooft algebra.
Supersymmetry and gravitational duality
Argurio, Riccardo; Dehouck, Francois; Houart, Laurent
2009-06-15
We study how the supersymmetry algebra copes with gravitational duality. As a playground, we consider a charged Taub-Newman-Unti-Tamburino(NUT) solution of D=4, N=2 supergravity. We find explicitly its Killing spinors, and the projection they obey provides evidence that the dual magnetic momenta necessarily have to appear in the supersymmetry algebra. The existence of such a modification is further supported using an approach based on the Nester form. In the process, we find new expressions for the dual magnetic momenta, including the NUT charge. The same expressions are then rederived using gravitational duality.
Water filling and electric field-induced enhancement in the mechanical property of carbon nanotubes.
Ye, H F; Zheng, Y G; Zhang, Z Q; Chen, Z; Zhang, H W
2015-01-01
The effects of water filling and electric field on the mechanical property of carbon nanotubes (CNTs) are investigated with molecular dynamics simulations. The simulation results indicate that the water filling and electric field could enhance the elastic modulus but reduce the Poisson's ratio of the CNTs. As for the buckling behaviors, a significant enhancement could be observed in the yield stress and average post-buckling stress of the CNTs. In particular, the enhancement in the yield stress induced by the water filling and electric field could be even higher than that resulted from the solid filling. Moreover, a transition mechanism from the rod instability to shell buckling is shown to explain the nonmonotonic variation of yield stress, and the critical diameter can be tuned through filling the water molecules and applying the electric field. The present findings provide a valuable route for the optimized design and application of the nanoscale functional devices based on the water-filled CNTs. PMID:26621767
NASA Astrophysics Data System (ADS)
Putrov, Pavel; Song, Jaewon; Yan, Wenbin
2016-03-01
We study a class of two-dimensional N=(0,4) quiver gauge theories that flow to superconformal field theories. We find dualities for the superconformal field theories similar to the 4d N=2 theories of class S , labelled by a Riemann surface C . The dual descriptions arise from various pair-of-pants decompositions, that involve an analog of the T N theory. Especially, we find the superconformal indices of such theories can be written in terms of a topological field theory on C. We interpret this class of SCFTs as the ones coming from compactifying 6d N=(2,0) theory on C{P}^1× C. Moreover, some new dualities of (0 , 2) and (2 , 2) theories are also discussed.
Putrov, Pavel; Song, Jaewon; Yan, Wenbin
2016-03-29
We study a class of two-dimensional N = (0; 4) quiver gauge theories that flow to superconformal field theories. We find dualities for the superconformal field theories similar to the 4d N = 2 theories of class S, labelled by a Riemann surface C. The dual descriptions arise from various pair-of-pants decompositions, that involve an analog of the TN theory. Especially, we find the superconformal indices of such theories can be written in terms of a topological field theory on C. In conclusion, we interpret this class of SCFTs as the ones coming from compactifying 6d N = (2; 0)more » theory on CP1 x C. Moreover, some new dualities of (0; 2) and (2; 2) theories are also discussed.« less
Quantitative wave-particle duality
NASA Astrophysics Data System (ADS)
Qureshi, Tabish
2016-07-01
The complementary wave and particle character of quantum objects (or quantons) was pointed out by Niels Bohr. This wave-particle duality, in the context of the two-slit experiment, is here described not just as two extreme cases of wave and particle characteristics, but in terms of quantitative measures of these characteristics, known to follow a duality relation. A very simple and intuitive derivation of a closely related duality relation is presented, which should be understandable to the introductory student.
Supersymmetric duality in superloop space
NASA Astrophysics Data System (ADS)
Faizal, Mir; Tsun, Tsou Sheung
2015-07-01
In this paper we constructed superloop space duality for a four dimensional supersymmetric Yang-Mills theory with supersymmetry. This duality reduces to the ordinary loop space duality for the ordinary Yang-Mills theory. It also reduces to the Hodge duality for an abelian gauge theory. Furthermore, the electric charges, which are the sources in the original theory, appear as monopoles in the dual theory. Whereas, the magnetic charges, which appear as monopoles in the original theory, become sources in the dual theory.
Simple Model of a Rolling Water-Filled Bottle on an Inclined Ramp
ERIC Educational Resources Information Center
Lin, Shihao; Hu, Naiwen; Yao, Tianchen; Chu, Charles; Babb, Simona; Cohen, Jenna; Sangiovanni, Giana; Watt, Summer; Weisman, Danielle; Klep, James; Walecki, Wojciech J.; Walecki, Eve S.; Walecki, Peter S.
2015-01-01
We investigate a water-filled bottle rolling down an incline and ask the following question: is a rolling bottle better described by a model ignoring all internal motion where the bottle is approximated by a material point sliding down an incline, or is it better described by a rigid solid cylinder rolling down the incline without skidding? The…
The Structure of the Yeast Plasma Membrane SNARE Complex Reveals Destabilizing Water Filled Cavities
Strop, P.; Kaiser, S.E.; Vrljic, M.; Brunger, A.T.
2009-05-26
Soluble N-ethylmaleimide-sensitive factor attachment protein receptor (SNARE) proteins form a complex that leads to membrane fusion between vesicles, organelles, and plasma membrane in all eukaryotic cells. We report the 1.7{angstrom} resolution structure of the SNARE complex that mediates exocytosis at the plasma membrane in the yeast Saccharomyces cerevisiae. Similar to its neuronal and endosomal homologues, the S. cerevisiae SNARE complex forms a parallel four-helix bundle in the center of which is an ionic layer. The S. cerevisiae SNARE complex exhibits increased helix bending near the ionic layer, contains water-filled cavities in the complex core, and exhibits reduced thermal stability relative to mammalian SNARE complexes. Mutagenesis experiments suggest that the water-filled cavities contribute to the lower stability of the S. cerevisiae complex.
Electrical breakdown of a bubble in a water-filled capillary
Bruggeman, P.J.; Leys, C.A.; Vierendeels, J. A.
2006-06-01
In this Communication, the electrical breakdown of a static bubble in a water-filled capillary generated in a dc electrical field is studied. We present experimental results which indicate that the liquid layer between capillary and bubble wall can have an important influence on the breakdown mechanism of the bubble. The breakdown electrical field (atmospheric pressure) without a liquid layer in a (vapor) bubble is 18 kV/cm. When a liquid layer is present, the electrical breakdown of an air bubble is observed at electrical fields typically two times smaller. Local plasma formation is observed in this case possibly due to bubble deformation.
Self-duality in Euclidean supergravity
NASA Astrophysics Data System (ADS)
Obrien, G. M.; Tchrakian, D. H.
1985-01-01
The compatibility conditions for curvatures satisfying self-duality (Hawking, 1978) and double-duality (Hehl et al., 1978) ansaetze in the theory of vacuum (Euclidean) supergravity and for the double-duality ansatz in Minkowski theory are investigated theoretically. It is found that the equations of motion of Euclidean supergravity admit solutions with self-dual curvature which correspond to nontrivial field configurations, and that the double-duality ansatz leads to nontrival configurations in both Euclidean and Minkowski cases.
Experimental and numerical study of water-filled vessel impacted by flat projectiles
NASA Astrophysics Data System (ADS)
Zhang, Wei; Ren, Peng; Huang, Wei; Gao, Yu Bo
2014-05-01
To understand the failure modes and impact resistance of double-layer plates separated by water, a flat-nosed projectile was accelerated by a two-stage light gas gun against a water-filled vessel which was placed in an air-filled tank. Targets consisted of a tank made of two flat 5A06 aluminum alloy plates held by a high strength steel frame. The penetration process was recorded by a digital high-speed camera. The same projectile-target system was also used to fire the targets placed directly in air for comparison. Parallel numerical tests were also carried out. The result indicated that experimental and numerical results were in good agreement. Numerical simulations were able to capture the main physical behavior. It was also found that the impact resistance of double layer plates separated by water was lager than that of the target plates in air. Tearing was the main failure models of the water-filled vessel targets which was different from that of the target plates in air where the shear plugging was in dominate.
Experimental and Numerical Study of Water-Filled Vessel Impacted by Flat Projectiles
NASA Astrophysics Data System (ADS)
Ren, Peng; Zhang, Wei; Guo, Zitao; Wei, Gang
2011-06-01
To understand the failure patterns and impact resistance of watertight vessel, a flat-nosed projectile was accelerated by a two-stage light gas gun against a vessel filled with water which was placed in an air-filled tank. The targets were the 5A06 aluminum which were installed on two opposite sides of the vessel. The penetration process was recorded by a digital high-speed camera. In order to compare, numerical simulations for the vessel with and without water impacted by projectiles were conducted by AUTODYN-3D. The material parameters of targets and projectiles used in the simulation were obtained from several previous studies. The result indicated that experimental and numerical results were in good agreement. Numerical simulations were capable to capture the main physical behavior. It was also found that the impact resistance of targets in the water-filled vessel was lager than that of the empty vessel. Tearing was the main failure models of the water-filled vessel targets which was different from that of the empty vessel where the shear plugging was in dominate.
Experimental and Numerical Study of Water-Filled Vessel Impacted by Flat Projectiles
NASA Astrophysics Data System (ADS)
Zhang, Wei; Ren, Peng; Huang, Wei; Gao, Yubo
2013-06-01
To understand the failure patterns and impact resistance of watertight vessel, a flat-nosed projectile was accelerated by a two-stage light gas gun against a vessel filled with water which was placed in an air-filled tank. The targets were the 5A06 aluminum which were installed on two opposite sides of the vessel. The penetration process was recorded by a digital high-speed camera. In order to compare, numerical simulations for the vessel with and without water impacted by projectiles were conducted by AUTODYN-3D. The material parameters of targets and projectiles used in the simulation were obtained from several previous studies. The result indicated that experimental and numerical results were in good agreement. Numerical simulations were capable to capture the main physical behavior. It was also found that the impact resistance of targets in the water-filled vessel was lager than that of the empty vessel. Tearing was the main failure models of the water-filled vessel targets which was different from that of the empty vessel where the shear plugging was in dominate. National Natural Science Foundation of China (NO.:11072072).
NASA Astrophysics Data System (ADS)
Slavnov, D. A.
2015-07-01
The problem of wave-particle duality is considered within the framework of the algebraic approach. Contrary to the widespread belief, we demonstrate that wave-particle duality can be reconciled with the assumption that there exists some local physical reality determining the results of local measurements. A number of quantum experiments—double-slit electron scattering, Wheeler's delayed choice experiment, the past of photons passed through the interferometer—are discussed using the concept of locality. A clear physical interpretation of these experiments that does not contradict classical concepts is provided.
Ion exchange phase transitions in water-filled channels with charged walls.
Zhang, J; Kamenev, A; Shklovskii, B I
2006-05-01
Ion transport through narrow water-filled channels is impeded by a high electrostatic barrier. The latter originates from the large ratio of the dielectric constants of the water and the surrounding media. We show that "doping," i.e., immobile charges attached to the walls of the channel, substantially reduces the barrier. This explains why most of the biological ion channels are "doped." We show that at rather generic conditions the channels may undergo ion exchange phase transitions (typically of the first order). Upon such a transition a finite latent concentration of ions may either enter or leave the channel, or be exchanged between the ions of different valences. We discuss possible implications of these transitions for the Ca-vs-Na selectivity of biological Ca channels. We also show that transport of divalent Ca ions is assisted by their fractionalization into two separate excitations.
Two-octave supercontinuum generation in a water-filled photonic crystal fiber.
Bethge, J; Husakou, A; Mitschke, F; Noack, F; Griebner, U; Steinmeyer, G; Herrmann, J
2010-03-15
Supercontinuum generation in a water-filled photonic crystal fiber is reported. By only filling the central hollow core of this fiber with water, the fiber properties are changed such that the air cladding provides broadband guiding. Using a pump wavelength of 1200 nm and few-microjoule pump pulses, the generation of supercontinua with two-octave spectral coverage from 410 to 1640 nm is experimentally demonstrated. Numerical simulations confirm these results, revealing a transition from a soliton-induced mechanism to self-phase modulation dominated spectral broadening with increasing pump power. Compared to supercontinua generated in glass core photonic fibers, the liquid core supercontinua show a higher degree of coherence, and the larger mode field area and the higher damage threshold of the water core enable significantly higher pulse energies of the white light pulses, ranging up to 0.39microJ. PMID:20389646
NASA Astrophysics Data System (ADS)
Yoshida, Eiichi; Wada, Akira; Karasawa, Naoki
2016-07-01
We generated a supercontinuum from a selectively water-filled photonic crystal fiber (PCF) for enhancement in the visible spectral region using an optical pulse from a Ti:sapphire oscillator at 804 nm. We prepared a 7-cm-long fused silica PCF, where the holes adjacent to the central core were filled with water, using a UV-curable adhesive to close holes selectively before filling holes with water by capillary force. Compared with that of the PCF without water, the group velocity dispersion curve of the selectively water-filled PCF became flatter near 800 nm and the intensity in the visible spectral region of the supercontinuum became higher and more uniform. The spectra simulated using the calculated dispersion properties of the selectively water-filled PCF showed good agreement with the experimental spectra.
NASA Astrophysics Data System (ADS)
Hohm, Olaf; Samtleben, Henning
2013-09-01
We extend the techniques of double field theory to more general gravity theories and U-duality symmetries, having in mind applications to the complete D = 11 supergravity. In this paper we work out a (3 + 3)-dimensional `U-duality covariantization' of D = 4 Einstein gravity, in which the Ehlers group SL(2, ) is realized geometrically, acting in the 3 representation on half of the coordinates. We include the full (2 + 1)-dimensional metric, while the `internal vielbein' is a coset representative of SL(2, )/SO(2) and transforms under gauge transformations via generalized Lie derivatives. In addition, we introduce a gauge connection of the `C-bracket', and a gauge connection of SL(2, ), albeit subject to constraints. The action takes the form of (2 + 1)-dimensional gravity coupled to a Chern-Simons-matter theory but encodes the complete D = 4 Einstein gravity. We comment on generalizations, such as an ` E 8(8) covariantization' of M-theory.
Thermal duality and gravitational collapse
NASA Astrophysics Data System (ADS)
Hewitt, Michael
2015-07-01
Thermal duality is a relationship between the behaviour of heterotic string models of the E(8)×E(8) or SO(32) types at inversely related temperatures, a variant of T duality in the Euclidean regime. This duality would have consequences for the nature of the Hagedorn transition in these string models. We propose that the vacuum admits a family of deformations in situations where there are closed surfaces of constant area but high radial acceleration (a string regularized version of a Penrose trapped surface), such as would be formed in situations of extreme gravitational collapse. This would allow a radical resolution of the firewall paradox by allowing quantum effects to significantly modify the spacetime geometry around a collapsed object. A string bremsstrahlung process would convert the kinetic energy of infalling matter in extreme gravitational collapse to form a region of the deformed vacuum, which would be equivalent to forming a high temperature string phase. A heuristic criterion for the conversion process is presented, relating Newtonian gravity to the string tension, suggesting an upper limit to the strength of the gravitational interaction. This conversion process might have observable consequences for charged particles falling into a rotating collapsed object by producing high energy particles via a variant of the Penrose process.
Quark-hadron duality in structure functions
Wally Melnitchouk
2011-09-01
We review recent progress in the study of quark-hadron duality in electron–nucleon structure functions. New developments include insights into the local aspects of duality obtained using truncated moments of structure functions, which allow duality-violating higher-twist contributions to be identified in individual resonance regions. Preliminary studies of pion electropro-duction have also showed the first glimpses of duality in semi-inclusive cross sections, which if confirmed would greatly expand the scope of constraining the flavor and spin dependence of parton distributions.
Simple Model of a Rolling Water-Filled Bottle on an Inclined Ramp
NASA Astrophysics Data System (ADS)
Lin, Shihao; Hu, Naiwen; Yao, Tianchen; Chu, Charles; Babb, Simona; Cohen, Jenna; Sangiovanni, Giana; Watt, Summer; Weisman, Danielle; Klep, James; Walecki, Wojciech J.; Walecki, Eve S.; Walecki, Peter S.
2015-12-01
We investigate a water-filled bottle rolling down an incline and ask the following question: is a rolling bottle better described by a model ignoring all internal motion where the bottle is approximated by a material point sliding down an incline, or is it better described by a rigid solid cylinder rolling down the incline without skidding? The measurements presented here represent a special case of similar experiments described by K.A. Jackson et al. (see Ref. 1 and references within). There exists also a report by Kagan describing the motion of soda cans rolling on an incline. In our case we investigate motion of the fully filled bottle. We demonstrate that within accuracy of our experiment the motion of the bottle can be described by a simple "frictionless water" model. The analysis of the dynamics of the bodies sliding and rolling on a ramp is a standard component of introductory physics classes, and a required component of the Advanced Placement (AP) Physics curriculum.
Response of a water-filled spherical vessel to an internal explosion
Lewis, M.W.; Wilson, T.L.
1997-06-01
Many problems of interest to the defense community involve fluid-structure interaction (FSI). Such problems include underwater blast loading of structures, bubble dynamics and jetting around structures, and hydrodynamic ram events. These problems may involve gas, fluid, and solid dynamics, nonlinear material behavior, cavitation, reaction kinetics, material failure, and nonlinearity that is due to varying geometry and contact conditions within a structure or between structures. Here, the authors model the response of a water-filled, thick-walled, spherical steel vessel to an internal explosion of 30 grams of C-4 with FSI2D--a two-dimensional coupled finite element and finite volume hydrodynamics code. The gas phase detonation products were modeled with a Becker-Kistiakowsky-Wilson high-explosive equation of state. Predictions from a fully coupled model were compared to experimental results in the form of strain gauge traces. Agreement was reasonably good. Additionally, the calculation was run in an uncoupled mode to understand the importance of fluid-structure interaction in this problem. The uncoupled model results in an accumulation of nonphysical energy in the vessel.
Response of a water-filled spherical vessel to an internal explosion
Wilson, T.L.; Lewis, M.W.
1997-10-01
Many problems of interest to the defense community involve fluid-structure interaction (FSI). To model such problems in two-dimensions the authors developed the FSI2D code by coupling MFICE2D, a Los Alamos finite volume computation fluid dynamics (CFD) code, with PRONTO2D, a SANDIA finite element solid dynamics code. Details on this coupling approach and current implementations are discussed in Section 3. In this report the authors use FSI2D to model the response of Jumbino, a water-filled spherical steel vessel (63.4 cm i.d., 6.1 cm wall thickness), to an internal explosion caused by detonating 30 grams of C-4 at the center of the vessel. Predictions from a fully coupled model were compared to experimental results in the form of strain gauge traces. Agreement was reasonably good. Additionally, the calculation was run in an uncoupled mode to understand the importance of fluid-structure interaction in this problem. The uncoupled model results in an accumulation of nonphysical energy in the vessel.
A comparative molecular analysis of water-filled limestone sinkholes in north-eastern Mexico.
Sahl, Jason W; Gary, Marcus O; Harris, J Kirk; Spear, John R
2011-01-01
Sistema Zacatón in north-eastern Mexico is host to several deep, water-filled, anoxic, karstic sinkholes (cenotes). These cenotes were explored, mapped, and geochemically and microbiologically sampled by the autonomous underwater vehicle deep phreatic thermal explorer (DEPTHX). The community structure of the filterable fraction of the water column and extensive microbial mats that coat the cenote walls was investigated by comparative analysis of small-subunit (SSU) 16S rRNA gene sequences. Full-length Sanger gene sequence analysis revealed novel microbial diversity that included three putative bacterial candidate phyla and three additional groups that showed high intra-clade distance with poorly characterized bacterial candidate phyla. Limited functional gene sequence analysis in these anoxic environments identified genes associated with methanogenesis, sulfate reduction and anaerobic ammonium oxidation. A directed, barcoded amplicon, multiplex pyrosequencing approach was employed to compare ∼100,000 bacterial SSU gene sequences from water column and wall microbial mat samples from five cenotes in Sistema Zacatón. A new, high-resolution sequence distribution profile (SDP) method identified changes in specific phylogenetic types (phylotypes) in microbial mats at varied depths; Mantel tests showed a correlation of the genetic distances between mat communities in two cenotes and the geographic location of each cenote. Community structure profiles from the water column of three neighbouring cenotes showed distinct variation; statistically significant differences in the concentration of geochemical constituents suggest that the variation observed in microbial communities between neighbouring cenotes are due to geochemical variation.
The Characteristic of Porous Charges on a Base of a Water-Filled RDX Powder
NASA Astrophysics Data System (ADS)
Valiano, Georgy; Yankovskiy, Boris; Milyavskiy, Vladimir; Borodina, Tatiana
2011-06-01
A detonation velocity of a condensed RDX linearly depends on density at a range of 1,0-1,8 g/cm3. These charges are porous if the density of RDX monocrystal is 1,806 g/cm3. The state of porous charge can be characterized by the packing density. It can be rising, if RDX powder will be mixed with water for deciding technological problems. It is necessary to be able to predict characteristics of such charges. Charges on a base of a water-filled RDX powder with air inclusions can be described by three parameters: a density of a charge, packing density of RDX powder and RDX mass fraction. Last two parameters are independent parameters of a mix. We have designed a nomogram for definition of mutual communication of three quantities: velocity of a detonation, density of packing of RDX powder and its mass fraction in a mix. To check up correctness of a prelegends of a nomogram, we have carried out measurement of a detonation velocity of porous water-contained RDX charges. We prepared charges on a base of RDX powder which has consisted of particles with a size 80-220 mcm. We was changing RDX mass fraction of charges in a range 0,6-1,0 and a packing density of RDX powder in a range of 1,0-1,4 g/cm3. The disorder of experimental data concerning the nomogram data did not exceed basically of 3 percent.
Morphodynamics of a granular bed in a water-filled cylinder subjected to perturbed oscillations
NASA Astrophysics Data System (ADS)
Duran-Matute, Matias; van Gorp, Thijs; van Heijst, Gertjan
2015-11-01
We study experimentally the morphodynamics of a granular bed at the bottom of an oscillating water-filled cylinder. The granules are translucent PMMA particles with a typical size of 2mm. The bed thickness is measured in real time using a light attenuation technique. As shown already by previous work, the bed remains flat close to the center of the cylinder, and radial ripples form at outer radii. The size of the inner flat region and the number or ripples depend on the frequency and amplitude of the cylinder's oscillation. In the present work, we are interested in the dynamics and control of the bed forms when the primary sinusoidal signal of the oscillation is perturbed by adding a second sinusoidal signal with a relatively small amplitude, a different frequency, and a phase lag. Varying the parameters of the secondary signal results in a signal that can be asymmetric or modulated, for example. These properties translate into the bed producing simple behavior like the propagation of the ripples at a constant speed or more complex behavior like the time dependent coarsening and thinning of the ripples. This research is funded by NWO (the Netherlands) through the VENI grant 863.13.022.
A simple water-filled plethysmograph for measurement of limb blood flow in humans.
Raine, Neil M; Sneddon, Jennifer C
2002-12-01
Fundamental principles underpinning the study of cardiovascular physiology can be emphasized by measuring blood flow. Plethysmography is an appropriate, noninvasive technique to use but may not be available to some institutions. Therefore, for measurement of blood flow in human limbs, we developed a simple water-filled plethysmograph that may be built with minimal technical support. The device is formed from a plastic cylinder and houses a latex sleeve sealed at either end by means of circular flanges and rubber O-ring seals. Limb volume changes are transcribed using an air-filled piston recorder. This instrument proves to be sensitive and accurately determines limb volume changes over time. Utilizing an appropriate venous occlusion protocol, predicted vascular responses to postural challenge and physical exercise may be followed. In response to a questionnaire, a majority of students (n = 33) agreed that performing blood flow measurements succeeded in relating theory to practice, improved technical and observational skills, and made the learning experience real. This modified plethysmograph proves to be a valuable teaching tool in human physiology classes. PMID:12031944
The impact of tungsten long rod penetrators into water filled targets
Wilson, L.T.; Dickinson, D.L.; Hertel, E.S. Jr.
1998-02-01
Twelve experiments were conducted to determine the effect of water filled targets on the penetration of tungsten long rods in terms of their residual mass and integrity. CTH hydrocode calculations were performed for each of the experiments to ensure that the erosion and breakup of the tungsten projectiles could be accurately reproduced. The CTH hydrocode predictions correlation well with the experimental results in most cases. Only 8% of the variance is unexplained. The slip interface between the rod and water was approximated in one of two ways: (1) using the CTH BLINT option in 2-D or (2) using a standard Eulerian mixed cells treatment. Results indicate that a 3-D BLINT algorithm is critical to predicting rod residual lengths. The authors were unable to reproduce rod fracture that occurred in every experiment where the water column exceeded 25 cm in length. The authors feel that this is due to a change in rod material properties during penetration, and continue to investigate the issue.
Motion of a free cylinder inside a rotating water-filled drum
NASA Astrophysics Data System (ADS)
Hernández, R. H.; Vial, A.; Barraud, C.
2015-08-01
We report experimental results on the motion and levitation of a freely to-move heavy cylinder, of constant diameter and varying mass, inside a water-filled drum rotating around its horizontal axis. The resulting flow field and the cylinder dynamics were determined with the aid of flow visualizations and particle image velocimetry methods. The spatial tracking of the inner cylinder was done with the aid of Fourier cross correlation methods. The steady bulk flow field created by the drum rotation generated forces that make the inner cylinder to counter-rotate without contact with the drum walls. Testing different cylinder masses and rotating drum frequencies has shown that there exists a range of stable spatial positions of the inner cylinder describing an angular segment inside the drum flow. The cylinder frequency can be set to zero if we increase the drum frequency beyond a threshold value. Increasing the drum frequency produces a stronger secondary flow circulation which is the key-mechanism responsible of the counter-rotating cylinder frequency. At this point, the inner cylinder levitates with a constant separation from the drum walls close to half of its diameter. Tests on heavy hollow cylinders revealed that the fluid filling the cylinder remains at rest while the cylinder was under levitation with zero rotation frequency.
Estimation of water-filled and air-filled porosity in the unsaturated zone, Yucca Mountain, Nevada
Nelson, Philip H.
1993-01-01
The responses of density and dielectric logs are formulated in terms if the matrix properties, air-filled porosity and water-filled porosity. Porosity values obtained from logs from borehole USW G-2 are in reasonable agreement with estimates from core determinations.
Managing Dualities in Planned Change Initiatives
ERIC Educational Resources Information Center
Barge, J. Kevin; Lee, Michael; Maddux, Kristy; Nabring, Richard; Townsend, Bryan
2008-01-01
Dualities play an important role in creating the conditions for change and managing planned change initiatives. Building on Seo, Putnam, and Bartunek's (2003) work, this study focuses on the dualities associated with managing change processes. A case study of a planned change process called the Circle of Prosperity Initiative, a multi-stakeholder…
Gluon-glueball duality and glueball searches
Nussinov, Shmuel; Shrock, Robert
2009-09-01
We discuss a notion of gluon-glueball duality analogous to quark-hadron duality. We apply this idea to the radiative decay of heavy orthoquarkonium, QQ{yields}{gamma}gg, which has been used to search for glueballs. The duality is first introduced in two simplified contexts: (i) a hypothetical version of QCD without any light quarks and (ii) QCD in the large-N{sub c} limit. We then discuss how an approximate form of this duality could hold in real QCD, based on a hierarchy of time scales in the temporal evolution of the gg subsystem in radiative orthoquarkonium decay. We apply this notion of gluon-glueball duality to suggest a method that could be useful in experimental searches for glueballs.
Supersymmetry: Compactification, flavor, and dualities
NASA Astrophysics Data System (ADS)
Heidenreich, Benjamin Jones
N = 1 gauge theory dualities relating different world-volume gauge theories of D3 branes probing an orientifold singularity. We argue that these dualities originate from the S-duality of type IIB string theory, much like electromagnetic dualities of N = 4 gauge theories.
Ring wormholes via duality rotations
NASA Astrophysics Data System (ADS)
Gibbons, Gary W.; Volkov, Mikhail S.
2016-09-01
We apply duality rotations and complex transformations to the Schwarzschild metric to obtain wormhole geometries with two asymptotically flat regions connected by a throat. In the simplest case these are the well-known wormholes supported by phantom scalar field. Further duality rotations remove the scalar field to yield less well known vacuum metrics of the oblate Zipoy-Voorhees-Weyl class, which describe ring wormholes. The ring encircles the wormhole throat and can have any radius, whereas its tension is always negative and should be less than -c4 / 4 G. If the tension reaches the maximal value, the geometry becomes exactly flat, but the topology remains non-trivial and corresponds to two copies of Minkowski space glued together along the disk encircled by the ring. The geodesics are straight lines, and those which traverse the ring get to the other universe. The ring therefore literally produces a hole in space. Such wormholes could perhaps be created by negative energies concentrated in toroidal volumes, for example by vacuum fluctuations.
String duality and black holes
NASA Astrophysics Data System (ADS)
Kalara, S.; Nanopoulos, D. V.
1991-09-01
In the context of (semi) classical general relativity, the physics of black holes poses many unanswered and unsettling questions. Notable among them are the loss of quantum coherence, which casts doubts on the basic foundations of quantum mechanics, and the understanding of the enormous entropy carried by black holes which is at odds with strong ``no hair'' theorems. We point out that in string theory, black-hole type solutions (S-black holes) carry local discrete charges inherited from the duality symmetries of the string, which allow S-black holes to carry ``quantum hair''. It is further noted that the conservation of the discrete charges and the presence of quantum hair precludes the information about a quantum state from being completely lost in the black hole thus rescuing quantum coherence. We also note that a large number of quantum hair carried by S-black holes may explain their enormous entropy, i.e. it is the duality symmetry of the string theory which redeems outstanding problems of black-hole dynamics. We also discuss a possible description of black holes as solitons of string theory. Supported in part by DOE Grant DE-AS05-81 ER40039.
Geochemistry and Hydrogeology of Water-Filled Sinkholes at Bitter Lake NWR, Roswell, NM
NASA Astrophysics Data System (ADS)
Premo, Z. E.; Crossey, L. J.
2008-12-01
Bitter Lake NWR in southeast (Roswell) New Mexico is located at the convergence of the Pecos River and the surface discharge region in the Roswell Artesian Basin (shallow alluvial aquifer and carbonate aquifer). The Refuge hosts approximately 50 water-filled sinkholes, which each support a unique and diverse aquatic ecosystem. An initial survey of water chemistries indicates that each sink has a unique chemical identity and neutral to alkaline pH. Sinkholes are filled by one or more artesian springs, groundwater seepage and possible hydrothermal water sources. We present results of water and gas analyses of 10 representative sinkholes, sampled during spring and summer, 2008. Analytical results, including major ions, metals (arsenic, selenium, iron), and gas chemistries are compared with monitoring well data from wells found to the north of the Refuge, along the Pecos River, and to the west, along the Pecos Slope - the regional aquifer recharge area. Well samples representative of regional groundwater provide potential end member perspectives for sources of sinkhole waters. Samples were collected incrementally from the surface to sinkhole floor to profile the limnological structure and to assess chemical variation and mixing through the water column. A sonde was deployed to measure and record physical parameters. Results of the analysis are used to describe the geochemical mixing that is occurring within the sinks. As each sink behaves as an independent unit, those separated by less than 10 meters can have dramatic variability in chemical signature and biological influence. For example, among the 29 sinks sampled during the initital survey, chloride concentrations range from 1.912x10-3 to 1.405 mol/kg; sulfate from 7.204x10-4 to 0.1364 mol/kg; and fluoride from 3.579x10-4 to 3.453x10-3 mol/kg. Along the Pecos Slope, groundwater chloride concentrations increase from less than 1.410x10-3 mol/kg near the major recharge area in the Sacramento Mountains to 0.141 mol
Manifest duality for partially massless higher spins
NASA Astrophysics Data System (ADS)
Hinterbichler, Kurt; Joyce, Austin
2016-09-01
In four dimensions, partially massless fields of all spins and depths possess a duality invariance akin to electric-magnetic duality. We construct metric-like gauge invariant curvature tensors for partially massless fields of all integer spins and depths, and show how the partially massless equations of motion can be recovered from first order field equations and Bianchi identities for these curvatures. This formulation displays duality in its manifestly local and covariant form, in which it acts to interchange the field equations and Bianchi identities.
Gravitational duality, branes and charges
NASA Astrophysics Data System (ADS)
Hull, C. M.
1998-03-01
D = 10 type II strings and M-theory in D = 11 have D - 5 branes and 9-branes that are not standard p-branes coupled to anti-symmetric tensors. The global charges in a D-dimensional theory of gravity consist of a momentum PM and a dual D - 5 form charge KM1… MD-5 , which is related to the NUT charge. On dimensional reduction, P gives the electric charge and K the magnetic charge of the graviphoton. Supersymmetry and U-duality imply that the type IIB theory has ( p, q) 9-branes. Orientifolding with 32 (0,1) 9-branes gives the type I string, while modding out by a related discrete symmetry with 32 (1,0) 9-branes gives the SO(32) heterotic string. Some of this material appeared in Nuclear Physics B509 (1997) 252, hep-th/9705162.
Can (electric-magnetic) duality be gauged?
Bunster, Claudio; Henneaux, Marc
2011-02-15
There exists a formulation of the Maxwell theory in terms of two vector potentials, one electric and one magnetic. The action is then manifestly invariant under electric-magnetic duality transformations, which are rotations in the two-dimensional internal space of the two potentials, and local. We ask the question: Can duality be gauged? The only known and battle-tested method of accomplishing the gauging is the Noether procedure. In its decanted form, it amounts to turning on the coupling by deforming the Abelian gauge group of the free theory, out of whose curvatures the action is built, into a non-Abelian group which becomes the gauge group of the resulting theory. In this article, we show that the method cannot be successfully implemented for electric-magnetic duality. We thus conclude that, unless a radically new idea is introduced, electric-magnetic duality cannot be gauged. The implication of this result for supergravity is briefly discussed.
Quark-Hadron Duality in Electron Scattering
Wally Melnitchouk; Rolf Ent; Cynthia Keppel
2004-08-01
The duality between partonic and hadronic descriptions of physical phenomena is one of the most remarkable features of strong interaction physics. A classic example of this is in electron-nucleon scattering, in which low-energy cross sections, when averaged over appropriate energy intervals, are found to exhibit the scaling behavior expected from perturbative QCD. We present a comprehensive review of data on structure functions in the resonance region, from which the global and local aspects of duality are quantified, including its flavor, spin and nuclear medium dependence. To interpret the experimental findings, we discuss various theoretical approaches which have been developed to understand the microscopic origins of quark-hadron duality in QCD. Examples from other reactions are used to place duality in a broader context, and future experimental and theoretical challenges are identified.
The Hydrochemical Evolution of Water-Filled Sinkholes at Bitter Lake NWR, Roswell, NM
NASA Astrophysics Data System (ADS)
Premo, E.; Crossey, L. J.
2013-12-01
Bitter Lake National Wildlife Refuge in Roswell, NM houses one of the most ecologically significant wetlands in the US-SW including approximately 52 water-filled sinkholes each supporting a unique biological assemblage, including several endangered and endemic species (e.g., Pecos pupfish and Noel's amphipod, respectively). Forming in the karst landscape adjacent to the Pecos River where the regional dual-aquifer system discharges through a network of springs and seeps, these sinkholes are recharged by saline groundwater that is subject to anthropogenic withdrawals for irrigation and hydrocarbon production and chemically altered by a complex series of evaporation-precipitation reactions after discharge. This study investigates the hydrochemical differences among these sinkholes while considering the evolutionary processes affecting water column structure, geochemical mixing and ecological sustainability. Two major sampling suites, pre- and post-irrigation, yielded waters from 1.0m increments along the water columns of 10 representative sinkholes. Samples were analyzed for major ions, stable isotopes [δ18O, δD ], and dissolved gases; PHREEQc was used to model mineral saturation and speciation. An in-situ mineral precipitation experiment provided growth rate and mineral morphological (SEM) data. Source water is chemically similar to shallow springs found at the Refuge (Sago Spring). Sinkholes exhibit bimodal water column structure (well-mixed or stratified) organized in response to water density (with ~1.035 g/cm3 forming the modal transition threshold). By measuring the density, TDS or conductivity at sinkhole surface it is possible to predict modality of water column structure. Sinkhole waters - regardless of depth or season - fall along a common isotopic evaporation trajectory (δ D = 3.387*δ18O - 19.38), and adopt a Na-Cl chemical endmember facies. Driven primarily by physical sinkhole geometry (e.g., depth and surface area), sinkhole water follows a
Quantum corrections of Abelian duality transformations
NASA Astrophysics Data System (ADS)
Balog, J.; Forgács, P.; Horváth, Z.; Palla, L.
1996-02-01
A modification of the Abelian duality transformations is proposed guaranteeing that a (not necessarily conformally invariant) σ-model be quantum equivalent (at least up to two loops in perturbation theory) to its dual. This requires a somewhat nonstandard perturbative treatment of the dual σ-model. Explicit formulae of the modified duality transformation are presented for a special class of block diagonal purely metric σ-models.
Duality and helicity: A symplectic viewpoint
NASA Astrophysics Data System (ADS)
Elbistan, M.; Duval, C.; Horváthy, P. A.; Zhang, P.-M.
2016-10-01
The theorem which says that helicity is the conserved quantity associated with the duality symmetry of the vacuum Maxwell equations is proved by viewing electromagnetism as an infinite dimensional symplectic system. In fact, it is shown that helicity is the moment map of duality acting as an SO (2) group of canonical transformations on the symplectic space of all solutions of the vacuum Maxwell equations.
Duality in Semi-Inclusive Pion Electroproduction
F E Close, W Melnitchouk
2009-05-01
We explore quark-hadron duality in semi-inclusive pion electroproduction on proton and neutron targets. Using the spin-flavor symmetric quark model, we compute ratios of $\\pi^+$ and $\\pi^-$ cross sections for both unpolarized and polarized scattering, and discuss realizations of duality in several symmetry breaking scenarios. The model calculations allow one to understand some of the key features of recent data on semi-inclusive pion production at low energies.
Duality, Entropy and ADM Mass in Supergravity
Cerchiai, Bianca L.; Ferrara, Sergio; Marrani, Alessio; Zumino, Bruno
2009-02-23
We consider the Bekenstein-Hawking entropy-area formula in four dimensional extended ungauged supergravity and its electric-magnetic duality property. Symmetries of both"large" and"small" extremal black holes are considered, as well as the ADM mass formula for N=4 and N=8 supergravity, preserving different fraction of supersymmetry. The interplay between BPS conditions and duality properties is an important aspect of this investigation.
Duality, entropy, and ADM mass in supergravity
Cerchiai, Bianca L.; Zumino, Bruno; Ferrara, Sergio; Marrani, Alessio
2009-06-15
We consider the Bekenstein-Hawking entropy-area formula in four dimensional extended ungauged supergravity and its electric-magnetic duality property. Symmetries of both 'large' and 'small' extremal black holes are considered, as well as the ADM mass formula for N=4 and N=8 supergravity, preserving different fraction of supersymmetry. The interplay between BPS conditions and duality properties is an important aspect of this investigation.
Conformal aspects of Spinor-Vector duality
NASA Astrophysics Data System (ADS)
Faraggi, Alon E.; Florakis, Ioannis; Mohaupt, Thomas; Tsulaia, Mirian
2011-07-01
We present a detailed study of various aspects of Spinor-Vector duality in Heterotic string compactifications and expose its origin in terms of the internal conformal field theory. In particular, we illustrate the main features of the duality map by using simple toroidal orbifolds preserving N=1 and N=2 spacetime supersymmetries in four dimensions. We explain how the duality map arises in this context by turning on special values of the Wilson lines around the compact cycles of the manifold. We argue that in models with N=2 spacetime supersymmetry, the interpolation between the Spinor-Vector dual vacua can be continuously realized. We trace the origin of the Spinor-Vector duality map to the presence of underlying N=(2,2) and N=(4,4) SCFTs, and explicitly show that the induced spectral flow in the twisted sectors is responsible for the observed duality. The isomorphism between current algebra representations gives rise to a number of chiral character identities, reminiscent of the recently-discovered MSDS symmetry.
General Quantum Interference Principle and Duality Computer
NASA Astrophysics Data System (ADS)
Long, Gui-Lu
2006-05-01
In this article, we propose a general principle of quantum interference for quantum system, and based on this we propose a new type of computing machine, the duality computer, that may outperform in principle both classical computer and the quantum computer. According to the general principle of quantum interference, the very essence of quantum interference is the interference of the sub-waves of the quantum system itself. A quantum system considered here can be any quantum system: a single microscopic particle, a composite quantum system such as an atom or a molecule, or a loose collection of a few quantum objects such as two independent photons. In the duality computer, the wave of the duality computer is split into several sub-waves and they pass through different routes, where different computing gate operations are performed. These sub-waves are then re-combined to interfere to give the computational results. The quantum computer, however, has only used the particle nature of quantum object. In a duality computer, it may be possible to find a marked item from an unsorted database using only a single query, and all NP-complete problems may have polynomial algorithms. Two proof-of-the-principle designs of the duality computer are presented: the giant molecule scheme and the nonlinear quantum optics scheme. We also propose thought experiment to check the related fundamental issues, the measurement efficiency of a partial wave function.
Quark-Hadron Duality: Resonances and the Onset of Scaling
W. Melnitchouk
2001-03-01
We discuss the origin of Bloom-Gilman duality and the relationship between resonances and scaling in deep-inelastic scattering. We present a simple quantum mechanical model which reproduces the essential features of Bloom-Gilman duality at low Q{sup 2}, and describe applications of local duality relating structure functions at x{approximately}1 and elastic electromagnetic form factors.
Putative duality of presynaptic events.
Borisova, Tatiana; Borysov, Arsenii
2016-06-01
The main structure in the brain responsible not only for nerve signal transmission but also for its simultaneous regulation is chemical synapse, where presynaptic nerve terminals are of considerable importance providing release of neurotransmitters. Analyzing transport of glutamate, the major excitatory neurotransmitter in the mammalian CNS, the authors suggest that there are two main relatively independent mechanisms at the presynaptic level that can influence the extracellular glutamate concentration, and so signaling, and its regulation. The first one is well-known precisely regulated compound exocytosis of synaptic vesicles containing neurotransmitters stimulated by membrane depolarization, which increases significantly glutamate concentration in the synaptic cleft and initiates glutamate signaling through postsynaptic glutamate receptors. The second one is permanent glutamate turnover across the plasma membrane that occurs without stimulation and is determined by simultaneous non-pathological transporter-mediated release of glutamate thermodynamically synchronized with uptake. Permanent glutamate turnover is responsible for maintenance of dynamic glutamatein/glutamateout gradient resulting in the establishment of a flexible extracellular level of glutamate, which can be unique for each synapse because of dependence on individual presynaptic parameters. These two mechanisms, i.e. exocytosis and transporter-mediated glutamate turnover, are both precisely regulated but do not directly interfere with each other, because they have different intracellular sources of glutamate in nerve terminals for release purposes, i.e. glutamate pool of synaptic vesicles and the cytoplasm, respectively. This duality can set up a presynaptic base for memory consolidation and storage, maintenance of neural circuits, long-term potentiation, and plasticity. Arguments against this suggestion are also considered. PMID:26812863
A duality web of linear quivers
NASA Astrophysics Data System (ADS)
Brünner, Frederic; Spiridonov, Vyacheslav P.
2016-10-01
We show that applying the Bailey lemma to elliptic hypergeometric integrals on the An root system leads to a large web of dualities for N = 1 supersymmetric linear quiver theories. The superconformal index of Seiberg's SQCD with SU (Nc) gauge group and SU (Nf) × SU (Nf) × U (1) flavour symmetry is equal to that of Nf -Nc - 1 distinct linear quivers. Seiberg duality further enlarges this web by adding new quivers. In particular, both interacting electric and magnetic theories with arbitrary Nc and Nf can be constructed by quivering an s-confining theory with Nf =Nc + 1.
Noether symmetries and duality transformations in cosmology
NASA Astrophysics Data System (ADS)
Paliathanasis, Andronikos; Capozziello, Salvatore
2016-09-01
We discuss the relation between Noether (point) symmetries and discrete symmetries for a class of minisuperspace cosmological models. We show that when a Noether symmetry exists for the gravitational Lagrangian, then there exists a coordinate system in which a reversal symmetry exists. Moreover, as far as concerns, the scale-factor duality symmetry of the dilaton field, we show that it is related to the existence of a Noether symmetry for the field equations, and the reversal symmetry in the normal coordinates of the symmetry vector becomes scale-factor duality symmetry in the original coordinates. In particular, the same point symmetry as also the same reversal symmetry exists for the Brans-Dicke scalar field with linear potential while now the discrete symmetry in the original coordinates of the system depends on the Brans-Dicke parameter and it is a scale-factor duality when ωBD = 1. Furthermore, in the context of the O’Hanlon theory for f(R)-gravity, it is possible to show how a duality transformation in the minisuperspace can be used to relate different gravitational models.
Altruistic duality in evolutionary game theory
NASA Astrophysics Data System (ADS)
Cheon, Taksu
2003-11-01
A game-theoretic dynamical model of social preference and enlightened self-interest is formulated. Existence of symmetry and duality in the game matrices with altruistic social preference is revealed. The model quantitatively describes the dynamical evolution of altruism in prisoner's dilemma and the regime change in prey-predator dynamics.
Global-local duality in eternal inflation
Bousso, Raphael; Yang, I-S.
2009-12-15
We prove that the light-cone time cutoff on the multiverse defines the same probabilities as a causal patch with initial conditions in the longest-lived metastable vacuum. This establishes the equivalence of two measures of eternal inflation which naively appear very different (though both are motivated by holography). The duality can be traced to an underlying geometric relation which we identify.
On the universe's cybernetics duality behavior
NASA Astrophysics Data System (ADS)
Feria, Erlan H.
2015-05-01
Universal cybernetics is the study of control and communications in living and non-living systems. In this paper the universal cybernetics duality principle (UCDP), first identified in control theory in 1978 and expressing a cybernetic duality behavior for our universe, is reviewed. The review is given on the heels of major prizes given to physicists for their use of mathematical dualities in solving intractable problems in physics such as those of cosmology's `dark energy', an area that according to a recent New York Times article has become "a cottage industry in physics today". These dualities are not unlike those of our UCDP that are further enhanced with physical dualities. For instance, in 2008 the UCDP guided us to the derivation of the laws of retention in physics as the space-penalty dual of the laws of motion in physics, including the dark energy thought responsible for the observed increase of the volume of our Universe as it ages. The UCDP has also guided us to the discovery of significant results in other fields such as: 1) in matched processors for quantized control with applications in the modeling of central nervous system (CNS) control mechanisms; 2) in radar designs where the discovery of latency theory, the time-penalty dual of information-theory, has led us to high-performance radar solutions that evade the use of `big data' in the form of SAR imagery of the earth; and 3) in unveiling biological lifespan bounds where the life-expectancy of an organism is sensibly predicted through lingerdynamics, the identified time-penalty dual of thermodynamics, which relates its adult lifespan to either: a. the ratio of its body size to its nutritional consumption rate; or b. its specific heat-capacity; or c. the ratio of its nutritional consumption rate energy to its entropic volume energy, a type of dark energy that is consistent with the observed decrease in the mass density of the organism as it ages.
Conceptual Aspects of Gauge/Gravity Duality
NASA Astrophysics Data System (ADS)
De Haro, Sebastian; Mayerson, Daniel R.; Butterfield, Jeremy N.
2016-11-01
We give an introductory review of gauge/gravity duality, and associated ideas of holography, emphasising the conceptual aspects. The opening sections gather the ingredients, viz. anti-de Sitter spacetime, conformal field theory and string theory, that we need for presenting, in Sect. 5, the central and original example: Maldacena's AdS/CFT correspondence. Sections 6 and 7 develop the ideas of this example, also in applications to condensed matter systems, QCD, and hydrodynamics. Sections 8 and 9 discuss the possible extensions of holographic ideas to de Sitter spacetime and to black holes. Section 10 discusses the bearing of gauge/gravity duality on two philosophical topics: the equivalence of physical theories, and the idea that spacetime, or some features of it, are emergent.
Conceptual Aspects of Gauge/Gravity Duality
NASA Astrophysics Data System (ADS)
De Haro, Sebastian; Mayerson, Daniel R.; Butterfield, Jeremy N.
2016-07-01
We give an introductory review of gauge/gravity duality, and associated ideas of holography, emphasising the conceptual aspects. The opening sections gather the ingredients, viz. anti-de Sitter spacetime, conformal field theory and string theory, that we need for presenting, in Sect. 5, the central and original example: Maldacena's AdS/CFT correspondence. Sections 6 and 7 develop the ideas of this example, also in applications to condensed matter systems, QCD, and hydrodynamics. Sections 8 and 9 discuss the possible extensions of holographic ideas to de Sitter spacetime and to black holes. Section 10 discusses the bearing of gauge/gravity duality on two philosophical topics: the equivalence of physical theories, and the idea that spacetime, or some features of it, are emergent.
Dimensional-duality and Its Lie Groups
NASA Astrophysics Data System (ADS)
Sinha, Nilotpal
2009-01-01
For a claim to a dimensional duality, we consider here that, the relativity is depending on a "double-fold" complex number for locally dense fourth axis within an enveloping 3D-space. This dimensional duality has been made here for locally dense m-dimensional geometry within n-space, for m > n, if every axis of m-space is dimensional-dual to its enveloping n-space. This locally dense m-dimensional geometry describes a reflexive complex function, viz., "transfusion" transformation, which establishes that, Lie group U(2) is the simply connected 1 to 2 enveloping group of SO(3, 1) within D-dual spaces only. Again, using the weight vectors, it is found that, there exists a SU(4) group, which may be a symmetry group for gravitons.
Grassmannian duality and the particle spectrum
NASA Astrophysics Data System (ADS)
Delbourgo, Robert
2016-09-01
Schemes based on anticommuting scalar coordinates, corresponding to properties, lead to generations of particles naturally. The application of Grassmannian duality cuts down the number of states substantially and is vital for constructing sensible Lagrangians anyhow. We apply duality to all of the subgroups within the classification group SU(3) ×SU(2)L ×SU(2)R, which encompasses the standard model gauge group, and thereby determine the full state inventory; this includes the definite prediction of quarks with charge - 4/3 and other exotic states. Assuming universal gravitational coupling to the gauge fields and parity even property curvature, we also obtain 4sin2𝜃 w = 1 - 2α/3αs which is not far from the experimental value around the MZ mass.
Unraveling duality violations in hadronic tau decays
Cata, Oscar; Cata, Oscar; Golterman, Maarten; Peris, Santiago
2008-03-03
There are some indications from recent determinations of the strong coupling constant alpha_s and the gluon condensate that the Operator Product Expansion may not be accurate enough to describe non-perturbative effects in hadronic tau decays. This breakdown of the Operator Product Expansion is usually referred to as being due to"Duality Violations." With the help of a physically motivated model, we investigate these duality violations. Based on this model, we argue how they may introduce a non-negligible systematic error in the current analysis, which employs finite-energy sum rules with pinched weights. In particular, this systematic effect might affect the precision determination of alpha_s from tau decays. With a view to a possible future application to real data, we present an alternative method for determining the OPE coefficients that might help estimating, and possibly even reducing, this systematic error.
Thermofield duality for higher spin Rindler Gravity
Jevicki, Antal; Suzuki, Kenta
2016-02-15
In this paper, we study the Thermo-field realization of the duality between the Rindler-AdS higher spin theory and O(N) vector theory. The CFT represents a decoupled pair of free O(N) vector field theories. It is shown how this decoupled domain CFT is capable of generating the connected Rindler-AdS background with the full set of Higher Spin fields.
NASA Astrophysics Data System (ADS)
Amabili, Marco; Balasubramanian, Prabakaran; Ferrari, Giovanni
2016-10-01
The nonlinear vibrations of a water-filled circular cylindrical shell subjected to radial harmonic excitation in the spectral neighbourhood of the lowest resonances are investigated experimentally and numerically by using a seamless aluminium sample. The experimental boundary conditions are close to simply supported edges. The presence of exact one-to-one internal resonance, giving rise to a travelling wave response around the shell circumference and non-stationary vibrations, is experimentally observed and the nonlinear response is numerically reproduced. The travelling wave is measured by means of state-of-the-art laser Doppler vibrometers applied to multiple points on the structure simultaneously. Chaos is detected in the frequency region where the travelling wave response is present. The reduced-order model is based on the Novozhilov nonlinear shell theory retaining in-plane inertia and the nonlinear equations of motion are numerically studied (i) by using a code based on arclength continuation method that allows bifurcation analysis in case of stationary vibrations, (ii) by a continuation code based on direct integration and Poincaré maps that evaluates also the maximum Lyapunov exponent in case of non-stationary vibrations. The comparison of experimental and numerical results is particularly satisfactory.
NASA Astrophysics Data System (ADS)
van der Ploeg, M. J.; Gooren, H. P. A.; Bakker, G.; Hoogendam, C. W.; Huiskes, C.; Koopal, L. K.; Kruidhof, H.; de Rooij, G. H.
2009-06-01
Measuring soil water potentials is crucial to characterize vadose zone processes. Water-filled tensiometers only measure until approximately -0.085 MPa, and indirect methods may suffer from the non-uniqueness in the relationship between matric potential and measured properties. Recently developed polymer tensiometers (POTs) are able to directly measure soil matric potentials until the theoretical wilting point (-1.6 MPa). By minimizing the volume of polymer solution inside the POT while maximizing the ceramic area in contact with that polymer solution, response times drop to acceptable ranges for laboratory and field conditions. Contact with the soil is drastically improved with the use of a cone-shaped solid ceramics instead of flat ceramics. The comparison between measured potentials by polymer tensiometers and indirectly obtained potentials with time domain reflectometry highlights the risk of using the latter method at low water contents. By combining POT and time domain reflectometry readings in situ moisture retention curves can be measured over the range permitted by time domain reflectometry.
Duality analysis on random planar lattices.
Ohzeki, Masayuki; Fujii, Keisuke
2012-11-01
The conventional duality analysis is employed to identify a location of a critical point on a uniform lattice without any disorder in its structure. In the present study, we deal with the random planar lattice, which consists of the randomized structure based on the square lattice. We introduce the uniformly random modification by the bond dilution and contraction on a part of the unit square. The random planar lattice includes the triangular and hexagonal lattices in extreme cases of a parameter to control the structure. A modern duality analysis fashion with real-space renormalization is found to be available for estimating the location of the critical points with a wide range of the randomness parameter. As a simple test bed, we demonstrate that our method indeed gives several critical points for the cases of the Ising and Potts models and the bond-percolation thresholds on the random planar lattice. Our method leads to not only such an extension of the duality analyses on the classical statistical mechanics but also a fascinating result associated with optimal error thresholds for a class of quantum error correction code, the surface code on the random planar lattice, which is known as a skillful technique to protect the quantum state.
Duality analysis on random planar lattices
NASA Astrophysics Data System (ADS)
Ohzeki, Masayuki; Fujii, Keisuke
2012-11-01
The conventional duality analysis is employed to identify a location of a critical point on a uniform lattice without any disorder in its structure. In the present study, we deal with the random planar lattice, which consists of the randomized structure based on the square lattice. We introduce the uniformly random modification by the bond dilution and contraction on a part of the unit square. The random planar lattice includes the triangular and hexagonal lattices in extreme cases of a parameter to control the structure. A modern duality analysis fashion with real-space renormalization is found to be available for estimating the location of the critical points with a wide range of the randomness parameter. As a simple test bed, we demonstrate that our method indeed gives several critical points for the cases of the Ising and Potts models and the bond-percolation thresholds on the random planar lattice. Our method leads to not only such an extension of the duality analyses on the classical statistical mechanics but also a fascinating result associated with optimal error thresholds for a class of quantum error correction code, the surface code on the random planar lattice, which is known as a skillful technique to protect the quantum state.
Hutchinson's duality: the once and future niche.
Colwell, Robert K; Rangel, Thiago F
2009-11-17
The duality between "niche" and "biotope" proposed by G. Evelyn Hutchinson provides a powerful way to conceptualize and analyze biogeographical distributions in relation to spatial environmental patterns. Both Joseph Grinnell and Charles Elton had attributed niches to environments. Attributing niches, instead, to species, allowed Hutchinson's key innovation: the formal severing of physical place from environment that is expressed by the duality. In biogeography, the physical world (a spatial extension of what Hutchinson called the biotope) is conceived as a map, each point (or cell) of which is characterized by its geographical coordinates and the local values of n environmental attributes at a given time. Exactly the same n environmental attributes define the corresponding niche space, as niche axes, allowing reciprocal projections between the geographic distribution of a species, actual or potential, past or future, and its niche. In biogeographical terms, the realized niche has come to express not only the effects of species interactions (as Hutchinson intended), but also constraints of dispersal limitation and the lack of contemporary environments corresponding to parts of the fundamental niche. Hutchinson's duality has been used to classify and map environments; model potential species distributions under past, present, and future climates; study the distributions of invasive species; discover new species; and simulate increasingly more realistic worlds, leading to spatially explicit, stochastic models that encompass speciation, extinction, range expansion, and evolutionary adaptation to changing environments. PMID:19805163
Hutchinson's duality: The once and future niche
Colwell, Robert K.; Rangel, Thiago F.
2009-01-01
The duality between “niche” and “biotope” proposed by G. Evelyn Hutchinson provides a powerful way to conceptualize and analyze biogeographical distributions in relation to spatial environmental patterns. Both Joseph Grinnell and Charles Elton had attributed niches to environments. Attributing niches, instead, to species, allowed Hutchinson's key innovation: the formal severing of physical place from environment that is expressed by the duality. In biogeography, the physical world (a spatial extension of what Hutchinson called the biotope) is conceived as a map, each point (or cell) of which is characterized by its geographical coordinates and the local values of n environmental attributes at a given time. Exactly the same n environmental attributes define the corresponding niche space, as niche axes, allowing reciprocal projections between the geographic distribution of a species, actual or potential, past or future, and its niche. In biogeographical terms, the realized niche has come to express not only the effects of species interactions (as Hutchinson intended), but also constraints of dispersal limitation and the lack of contemporary environments corresponding to parts of the fundamental niche. Hutchinson's duality has been used to classify and map environments; model potential species distributions under past, present, and future climates; study the distributions of invasive species; discover new species; and simulate increasingly more realistic worlds, leading to spatially explicit, stochastic models that encompass speciation, extinction, range expansion, and evolutionary adaptation to changing environments. PMID:19805163
Lai, Yei-Chen; Chen, Yi-Fan; Chiang, Yun-Wei
2013-01-01
There is considerable evidence for the essential role of surface water in protein function and structure. However, it is unclear to what extent the hydration water and protein are coupled and interact with each other. Here, we show by ESR experiments (cw, DEER, ESEEM, and ESE techniques) with spin-labeling and nanoconfinement techniques that the vitrified hydration layers can be evidently recognized in the ESR spectra, providing nanoscale understanding for the biological interfacial water. Two peptides of different secondary structures and lengths are studied in vitrified bulk solvents and in water-filled nanochannels of different pore diameter (6.1∼7.6 nm). The existence of surface hydration and bulk shells are demonstrated. Water in the immediate vicinity of the nitroxide label (within the van der Waals contacts, ∼0.35 nm) at the water-peptide interface is verified to be non-crystalline at 50 K, and the water accessibility changes little with the nanochannel dimension. Nevertheless, this water accessibility for the nanochannel cases is only half the value for the bulk solvent, even though the peptide structures remain largely the same as those immersed in the bulk solvents. On the other hand, the hydration density in the range of ∼2 nm from the nitroxide spin increases substantially with decreasing pore size, as the density for the largest pore size (7.6 nm) is comparable to that for the bulk solvent. The results demonstrate that while the peptides are confined but structurally unaltered in the nanochannels, their surrounding water exhibits density heterogeneity along the peptide surface normal. The causes and implications, especially those involving the interactions between the first hydration water and peptides, of these observations are discussed. Spin-label ESR techniques are proven useful for studying the structure and influences of interfacial hydration. PMID:23840841
Energy-weighted sum rules, y-scaling and duality
J. Wallace Van Orden; Sabine Jeschonnek
2002-09-01
The phenomena of scaling and Bloom-Gilman duality are examined in the context of simple nonrelativistic and relativistic quantum mechanical models. These models are shown to scale and to show the qualitative feature of Bloom-Gilman duality. This suggests that these phenomena do not necessarily require the properties of QCD.
Antagonistic functional duality of cancer genes.
Stepanenko, A A; Vassetzky, Y S; Kavsan, V M
2013-10-25
Cancer evolution is a stochastic process both at the genome and gene levels. Most of tumors contain multiple genetic subclones, evolving in either succession or in parallel, either in a linear or branching manner, with heterogeneous genome and gene alterations, extensively rewired signaling networks, and addicted to multiple oncogenes easily switching with each other during cancer progression and medical intervention. Hundreds of discovered cancer genes are classified according to whether they function in a dominant (oncogenes) or recessive (tumor suppressor genes) manner in a cancer cell. However, there are many cancer "gene-chameleons", which behave distinctly in opposite way in the different experimental settings showing antagonistic duality. In contrast to the widely accepted view that mutant NADP(+)-dependent isocitrate dehydrogenases 1/2 (IDH1/2) and associated metabolite 2-hydroxyglutarate (R)-enantiomer are intrinsically "the drivers" of tumourigenesis, mutant IDH1/2 inhibited, promoted or had no effect on cell proliferation, growth and tumorigenicity in diverse experiments. Similar behavior was evidenced for dozens of cancer genes. Gene function is dependent on genetic network, which is defined by the genome context. The overall changes in karyotype can result in alterations of the role and function of the same genes and pathways. The diverse cell lines and tumor samples have been used in experiments for proving gene tumor promoting/suppressive activity. They all display heterogeneous individual karyotypes and disturbed signaling networks. Consequently, the effect and function of gene under investigation can be opposite and versatile in cells with different genomes that may explain antagonistic duality of cancer genes and the cell type- or the cellular genetic/context-dependent response to the same protein. Antagonistic duality of cancer genes might contribute to failure of chemotherapy. Instructive examples of unexpected activity of cancer genes and
Hierarchy of inequalities for quantitative duality
Martinez-Linares, Jesus
2007-05-15
We derive different relations quantifying duality in a generic two-way interferometer. These relations set different upper bounds to the visibility V of the fringes measured at the output port of the interferometer. A hierarchy of inequalities is presented which exhibits the influence of the availability to the experimenter of different sources of which-way information contributing to the total distinguishability D of the ways. For mixed states and unbalanced interferometers an inequality is derived, V{sup 2}+{xi}{sup 2}{<=}1, which can be more stringent than the one associated with the distinguishability (V{sup 2}+D{sup 2}{<=}1)
Quantum duality, unbounded operators, and inductive limits
NASA Astrophysics Data System (ADS)
Dosi, Anar
2010-06-01
In this paper, we investigate the inductive limits of quantum normed (or operator) spaces. This construction allows us to treat the space of all noncommutative continuous functions over a quantum domain as a quantum (or local operator) space of all matrix continuous linear operators equipped with S-quantum topology. In particular, we classify all quantizations of the polynormed topologies compatible with the given duality proposing a noncommutative Arens-Mackey theorem. Further, the inductive limits of operator spaces are used to introduce locally compact and locally trace class unbounded operators on a quantum domain and prove the dual realization theorem for an abstract quantum space.
Spin Duality on the Neutron ($^3$He)
Patricia Solvignon
2006-02-01
Thomas Jefferson National Accelerator Facility experiment E01-012 measured the ^3He spin structure functions and virtual photon asymmetries in the resonance region in the range 1.0duality in g_1 and A_1 for ^3He and the neutron. Preliminary results for A_1^3He are presented as well as an overview of the experimental and theoretical developments.
Duality in supersymmetric Yang-Mills theory
Peskin, M.E.
1997-02-01
These lectures provide an introduction to the behavior of strongly-coupled supersymmetric gauge theories. After a discussion of the effective Lagrangian in nonsupersymmetric and supersymmetric field theories, the author analyzes the qualitative behavior of the simplest illustrative models. These include supersymmetric QCD for N{sub f} < N{sub c}, in which the superpotential is generated nonperturbatively, N = 2 SU(2) Yang-Mills theory (the Seiberg-Witten model), in which the nonperturbative behavior of the effect coupling is described geometrically, and supersymmetric QCD for N{sub f} large, in which the theory illustrates a non-Abelian generalization of electric-magnetic duality. 75 refs., 12 figs.
Diffractive Scattering and Gauge/String Duality
Tan, Chung-I [Brown University, Providence, Rhode Island, United States
2016-07-12
High-energy diffractive scattering will be discussed based on Gauge/String duality. As shown by Brower, Polchinski, Strassler and Tan, the ubiquitous Pomeron emerges naturally in gauge theories with string-theoretical descriptions. Its existence is intimately tied to gluons, and also to the energy-momentum tensor. With a confining dual background metric, the Pomeron can be interpreted as a 'massive graviton'. In a single unified step, both its infrared and ultraviolet properties are dealt with, reflecting confinement and conformal symmetry respectively. An effective field theory for high-energy scattering can be constructed. Applications based on this approach will also be described.
Spin Duality on the Neutron (^3He)
Solvignon, Patricia
2007-02-01
Thomas Jefferson National Accelerator Facility experiment E01-012 measured the 3He spin structure functions and virtual photon asymmetries in the resonance region in the momentum transfer range 1.0 < Q2 < 4.0 (GeV/c)2. Our date, when compared with existing deep inelastic scattering data, can be used to test quark-hadron duality in g1 and A1 for 3He and the neutron. Preliminary results for A{sub 1}{sup {sup 3}He} are presented, as well as some details about the experiment.
Apparent horizon in fluid-gravity duality
Booth, Ivan; Heller, Michal P.; Plewa, Grzegorz; Spalinski, Michal
2011-05-15
This article develops a computational framework for determining the location of boundary-covariant apparent horizons in the geometry of conformal fluid-gravity duality in arbitrary dimensions. In particular, it is shown up to second order and conjectured to hold to all orders in the gradient expansion that there is a unique apparent horizon which is covariantly expressible in terms of fluid velocity, temperature, and boundary metric. This leads to the first explicit example of an entropy current defined by an apparent horizon and opens the possibility that in the near-equilibrium regime there is preferred foliation of apparent horizons for black holes in asymptotically anti-de Sitter spacetimes.
DEFORMED DISTANCE DUALITY RELATIONS AND SUPERNOVA DIMMING
Lima, J. A. S.; Cunha, J. V.; Zanchin, V. T. E-mail: cunhajv@astro.iag.usp.br
2011-12-15
The basic cosmological distances are linked by the Etherington cosmic distance duality relation, {eta}(z) = D{sub L} (z)(1 + z){sup -2}/D{sub A} (z) {identical_to} 1, where D{sub L} and D{sub A} are, respectively, the luminosity and angular diameter distances. In order to test its validity, some authors have proposed phenomenological expressions for {eta}(z), thereby deforming the original Etherington's relation and comparing the resulting expressions with the available and future cosmological data. The relevance of such studies is unquestionable since any violation of the cosmic distance duality relation could be a signal of new physics or non-negligible astrophysical effects in the usually assumed perfectly transparent universe. In this Letter, we show that under certain conditions such expressions can be derived from a more fundamental approach with the parameters appearing in the {eta}(z) expression defining the cosmic absorption parameter as recently discussed by Chen and Kantowski. Explicit examples involving four different parameterizations of the deformation function are given. Based on such an approach, it is also found that the latest supernova data can also be explained in the framework of a pure cold dark matter model (Einstein-de Sitter). Two different scenarios with cosmic absorption are discussed. Only if the cosmic opacity is fully negligible, the description of an accelerating universe powered by dark energy or some alternative gravity theory must be invoked.
Duality relations in the auxiliary field method
Silvestre-Brac, Bernard
2011-05-15
The eigenenergies {epsilon}{sup (N)}(m;{l_brace}n{sub i}, l{sub i{r_brace}}) of a system of N identical particles with a mass m are functions of the various radial quantum numbers n{sub i} and orbital quantum numbers l{sub i}. Approximations E{sup (N)}(m;Q) of these eigenenergies, depending on a principal quantum number Q({l_brace}n{sub i}, l{sub i{r_brace}}), can be obtained in the framework of the auxiliary field method. We demonstrate the existence of numerous exact duality relations linking quantities E{sup (N)}(m;Q) and E{sup (p)}(m';Q') for various forms of the potentials (independent of m and N) and for both nonrelativistic and semirelativistic kinematics. As the approximations computed with the auxiliary field method can be very close to the exact results, we show with several examples that these duality relations still hold, with sometimes a good accuracy, for the exact eigenenergies {epsilon}{sup (N)}(m;{l_brace}n{sub i}, l{sub i{r_brace}}).
Fricke S-duality in CHL models
Persson, Daniel; Volpato, Roberto
2015-12-23
In this study, we consider four dimensional CHL models with sixteen spacetime supersymmetries obtained from orbifolds of type IIA superstring on K3×T^{2} by a Z_{N} symmetry acting (possibly) non-geometrically on K3. We show that most of these models (in particular, for geometric symmetries) are self-dual under a weak-strong duality acting on the heterotic axio-dilaton modulus S by a “Fricke involution” S → -1/NS. This is a novel symmetry of CHL models that lies outside of the standard SL(2,Z)-symmetry of the parent theory, heterotic strings on T^{6}. For self-dual models this implies that the lattice of purely electric charges is N-modular, i.e. isometric to its dual up to a rescaling of its quadratic form by N. We verify this prediction by determining the lattices of electric and magnetic charges in all relevant examples. We also calculate certain BPS-saturated couplings and verify that they are invariant under the Fricke S-duality. For CHL models that are not self-dual, the strong coupling limit is dual to type IIA compactified on T^{6}/Z_{N}, for some Z_{N}-symmetry preserving half of the spacetime supersymmetries.
Fricke S-duality in CHL models
Persson, Daniel; Volpato, Roberto
2015-12-23
In this study, we consider four dimensional CHL models with sixteen spacetime supersymmetries obtained from orbifolds of type IIA superstring on K3×T2 by a ZN symmetry acting (possibly) non-geometrically on K3. We show that most of these models (in particular, for geometric symmetries) are self-dual under a weak-strong duality acting on the heterotic axio-dilaton modulus S by a “Fricke involution” S → -1/NS. This is a novel symmetry of CHL models that lies outside of the standard SL(2,Z)-symmetry of the parent theory, heterotic strings on T6. For self-dual models this implies that the lattice of purely electric charges is N-modular,more » i.e. isometric to its dual up to a rescaling of its quadratic form by N. We verify this prediction by determining the lattices of electric and magnetic charges in all relevant examples. We also calculate certain BPS-saturated couplings and verify that they are invariant under the Fricke S-duality. For CHL models that are not self-dual, the strong coupling limit is dual to type IIA compactified on T6/ZN, for some ZN-symmetry preserving half of the spacetime supersymmetries.« less
Duality quantum computer and the efficient quantum simulations
NASA Astrophysics Data System (ADS)
Wei, Shi-Jie; Long, Gui-Lu
2016-03-01
Duality quantum computing is a new mode of a quantum computer to simulate a moving quantum computer passing through a multi-slit. It exploits the particle wave duality property for computing. A quantum computer with n qubits and a qudit simulates a moving quantum computer with n qubits passing through a d-slit. Duality quantum computing can realize an arbitrary sum of unitaries and therefore a general quantum operator, which is called a generalized quantum gate. All linear bounded operators can be realized by the generalized quantum gates, and unitary operators are just the extreme points of the set of generalized quantum gates. Duality quantum computing provides flexibility and a clear physical picture in designing quantum algorithms, and serves as a powerful bridge between quantum and classical algorithms. In this paper, after a brief review of the theory of duality quantum computing, we will concentrate on the applications of duality quantum computing in simulations of Hamiltonian systems. We will show that duality quantum computing can efficiently simulate quantum systems by providing descriptions of the recent efficient quantum simulation algorithm of Childs and Wiebe (Quantum Inf Comput 12(11-12):901-924, 2012) for the fast simulation of quantum systems with a sparse Hamiltonian, and the quantum simulation algorithm by Berry et al. (Phys Rev Lett 114:090502, 2015), which provides exponential improvement in precision for simulating systems with a sparse Hamiltonian.
Towards Reconciliation of Several Dualities in Physician Leadership
Walker, Keith; Kraines, Gerry
2015-01-01
Leadership has a renewed focus in healthcare, and physicians are being increasingly involved in a range of leadership roles. The aim of this paper is to discuss several dualities that exert tensions at the systems and individual levels. Although oppositional, the common dualities of physician leadership are not mutually exclusive but represent a complex, dynamic and interdependent relationship, often coexisting with each other and exerting tensions in multiple dimensions. The authors contend that a dialectic understanding – instead of either/or or finding a middle ground – of the opposite poles of these dualities allows for generating meaningful leadership perspectives and choices. PMID:25947031
Worldsheet interpretation of the level-rank duality
NASA Astrophysics Data System (ADS)
Soroush, Masoud
2016-09-01
Level-rank duality relates the observables of two different Chern-Simons theories in which the roles of the Chern-Simons level and the rank of the gauge group are exchanged. In this paper, we explore the consequences of this duality in the realm of topological string theory. We show that this duality induces a number of identities between the open Gromov-Witten invariants of the geometries associated with a knot K and its mirror image K ˜ . We show how these identities arise both in the A model and in the dual B model.
A nonabelian particle-vortex duality in gauge theories
NASA Astrophysics Data System (ADS)
Murugan, Jeff; Nastase, Horatiu
2016-08-01
We define a nonabelian version of particle-vortex duality, by dimensionally extending usual (1+1)-dimensional nonabelian T-duality to (2+1) dimensions. While we will explicitly describe a global SU(2) symmetry, our methods can also be applied to a larger group G, by gauging an appropriate subgroup. We will exemplify our duality with matter in both adjoint and fundamental representations by considering a modification of {N} = 2 supersymmetric Yang-Mills theory (Seiberg-Witten theory reduced to (2+1) dimensions), and an SU(2) × U(1) color-flavor locked theory that exhibits nonabelian vortex solutions.
Quark-hadron duality: Pinched kernel approach
NASA Astrophysics Data System (ADS)
Dominguez, C. A.; Hernandez, L. A.; Schilcher, K.; Spiesberger, H.
2016-08-01
Hadronic spectral functions measured by the ALEPH collaboration in the vector and axial-vector channels are used to study potential quark-hadron duality violations (DV). This is done entirely in the framework of pinched kernel finite energy sum rules (FESR), i.e. in a model independent fashion. The kinematical range of the ALEPH data is effectively extended up to s = 10 GeV2 by using an appropriate kernel, and assuming that in this region the spectral functions are given by perturbative QCD. Support for this assumption is obtained by using e+ e‑ annihilation data in the vector channel. Results in both channels show a good saturation of the pinched FESR, without further need of explicit models of DV.
Duality of force laws and conformal transformations
NASA Astrophysics Data System (ADS)
Kothawala, Dawood
2011-06-01
As was first noted by Isaac Newton, the two most famous ellipses of classical mechanics, arising from the force laws F ∝r and F ∝1/r2, can be mapped onto each other by changing the location of the center of force. Less well known is that this mapping can also be achieved by the complex transformation, z →z2. We derive this result and its generalization by writing the Gaussian curvature in its covariant form, and then changing the metric by a conformal transformation which mimics this mapping of the curves. We indicate how the conserved Laplace-Runge-Lenz vector for the 1/r2 force law transforms under this transformation, and compare it with the corresponding quantities for the linear force law. Our main aim is to present this duality by introducing concepts from differential geometry.
Gauge fields and infinite chains of dualities
NASA Astrophysics Data System (ADS)
Boulanger, Nicolas; Sundell, Per; West, Peter
2015-09-01
We show that the particle states of Maxwell's theory, in D dimensions, can be represented in an infinite number of ways by using different gauge fields. Using this result we formulate the dynamics in terms of an infinite set of duality relations which are first order in space-time derivatives. We derive a similar result for the three form in eleven dimensions where such a possibility was first observed in the context of E 11. We also give an action formulation for some of the gauge fields. In this paper we give a pedagogical account of the Lorentz and gauge covariant formulation of the irreducible representations of the Poincaré group, used previously in higher spin theories, as this plays a key role in our constructions. It is clear that our results can be generalised to any particle.
T-duality constraints on higher derivatives revisited
NASA Astrophysics Data System (ADS)
Hohm, Olaf; Zwiebach, Barton
2016-04-01
We ask to what extent are the higher-derivative corrections of string theory constrained by T-duality. The seminal early work by Meissner tests T-duality by reduction to one dimension using a distinguished choice of field variables in which the bosonic string action takes a Gauss-Bonnet-type form. By analyzing all field redefinitions that may or may not be duality covariant and may or may not be gauge covariant we extend the procedure to test T-duality starting from an action expressed in arbitrary field variables. We illustrate the method by showing that it determines uniquely the first-order α' corrections of the bosonic string, up to terms that vanish in one dimension. We also use the method to glean information about the O({α}^' 2}) corrections in the double field theory with Green-Schwarz deformation.
On quantum T-duality in σ models
NASA Astrophysics Data System (ADS)
Balog, J.; Forgács, P.; Mohammedi, N.; Palla, L.; Schnittger, J.
1998-12-01
The problem of quantum equivalence between non-linear sigma models related by Abelian or non-Abelian T-duality is studied in perturbation theory. Using the anomalous Ward identity for Weyl symmetry we derive a relation between the Weyl anomaly coefficients of the original and dual theories. The analysis is not restricted to conformally invariant backgrounds. The formalism is applied to the study of two examples. The first is a model based on SU(2) non-Abelian T-duality. The second represents a simple realization of Poisson-Lie T-duality involving the Drinfeld double based on US(2). In both cases quantum T-duality is established at the one-level.
Quantum corrections of Abelian Duality Transformations in Sigma models
NASA Astrophysics Data System (ADS)
Balog, J.; Forgács, P.; Horváth, Z.; Palla, L.
1997-07-01
A review is given of a recently proposed modification of the Abelian Duality transformations guaranteeing that a (not necessarily conformally invariant) σ-model be quantum equivalent (at least up to two loops in perturbation theory) to its dual. This requires a somewhat non standard perturbative treatment of the dual σ-model. Explicit formulae of the modified duality transformation are presented for a special class of block diagonal purely metric σ-models.
Global aspects of abelian duality in dimension three
NASA Astrophysics Data System (ADS)
Beasley, Chris
2014-08-01
In three dimensions, an abelian gauge field is related by duality to a free, periodic scalar field. Though usually considered on , this duality can be extended to a general three-manifold M , in which case topological features of M become important. Here I comment upon several of these features as related to the partition function on M. In a companion article, I discuss similarly the algebra of operators on a surface of genus g.
Duality quantum algorithm efficiently simulates open quantum systems
NASA Astrophysics Data System (ADS)
Wei, Shi-Jie; Ruan, Dong; Long, Gui-Lu
2016-07-01
Because of inevitable coupling with the environment, nearly all practical quantum systems are open system, where the evolution is not necessarily unitary. In this paper, we propose a duality quantum algorithm for simulating Hamiltonian evolution of an open quantum system. In contrast to unitary evolution in a usual quantum computer, the evolution operator in a duality quantum computer is a linear combination of unitary operators. In this duality quantum algorithm, the time evolution of the open quantum system is realized by using Kraus operators which is naturally implemented in duality quantum computer. This duality quantum algorithm has two distinct advantages compared to existing quantum simulation algorithms with unitary evolution operations. Firstly, the query complexity of the algorithm is O(d3) in contrast to O(d4) in existing unitary simulation algorithm, where d is the dimension of the open quantum system. Secondly, By using a truncated Taylor series of the evolution operators, this duality quantum algorithm provides an exponential improvement in precision compared with previous unitary simulation algorithm.
Duality quantum algorithm efficiently simulates open quantum systems.
Wei, Shi-Jie; Ruan, Dong; Long, Gui-Lu
2016-01-01
Because of inevitable coupling with the environment, nearly all practical quantum systems are open system, where the evolution is not necessarily unitary. In this paper, we propose a duality quantum algorithm for simulating Hamiltonian evolution of an open quantum system. In contrast to unitary evolution in a usual quantum computer, the evolution operator in a duality quantum computer is a linear combination of unitary operators. In this duality quantum algorithm, the time evolution of the open quantum system is realized by using Kraus operators which is naturally implemented in duality quantum computer. This duality quantum algorithm has two distinct advantages compared to existing quantum simulation algorithms with unitary evolution operations. Firstly, the query complexity of the algorithm is O(d(3)) in contrast to O(d(4)) in existing unitary simulation algorithm, where d is the dimension of the open quantum system. Secondly, By using a truncated Taylor series of the evolution operators, this duality quantum algorithm provides an exponential improvement in precision compared with previous unitary simulation algorithm. PMID:27464855
Duality quantum algorithm efficiently simulates open quantum systems.
Wei, Shi-Jie; Ruan, Dong; Long, Gui-Lu
2016-07-28
Because of inevitable coupling with the environment, nearly all practical quantum systems are open system, where the evolution is not necessarily unitary. In this paper, we propose a duality quantum algorithm for simulating Hamiltonian evolution of an open quantum system. In contrast to unitary evolution in a usual quantum computer, the evolution operator in a duality quantum computer is a linear combination of unitary operators. In this duality quantum algorithm, the time evolution of the open quantum system is realized by using Kraus operators which is naturally implemented in duality quantum computer. This duality quantum algorithm has two distinct advantages compared to existing quantum simulation algorithms with unitary evolution operations. Firstly, the query complexity of the algorithm is O(d(3)) in contrast to O(d(4)) in existing unitary simulation algorithm, where d is the dimension of the open quantum system. Secondly, By using a truncated Taylor series of the evolution operators, this duality quantum algorithm provides an exponential improvement in precision compared with previous unitary simulation algorithm.
Duality quantum algorithm efficiently simulates open quantum systems
Wei, Shi-Jie; Ruan, Dong; Long, Gui-Lu
2016-01-01
Because of inevitable coupling with the environment, nearly all practical quantum systems are open system, where the evolution is not necessarily unitary. In this paper, we propose a duality quantum algorithm for simulating Hamiltonian evolution of an open quantum system. In contrast to unitary evolution in a usual quantum computer, the evolution operator in a duality quantum computer is a linear combination of unitary operators. In this duality quantum algorithm, the time evolution of the open quantum system is realized by using Kraus operators which is naturally implemented in duality quantum computer. This duality quantum algorithm has two distinct advantages compared to existing quantum simulation algorithms with unitary evolution operations. Firstly, the query complexity of the algorithm is O(d3) in contrast to O(d4) in existing unitary simulation algorithm, where d is the dimension of the open quantum system. Secondly, By using a truncated Taylor series of the evolution operators, this duality quantum algorithm provides an exponential improvement in precision compared with previous unitary simulation algorithm. PMID:27464855
Nicholson, N.; Dowdy, E.J.; Holt, D.M.; Stump, C.J. Jr.
1982-05-13
A portable instrument for measuring induced Cerenkov radiation associated with irradiated nuclear fuel assemblies in a water-filled storage pond is disclosed. The instrument includes a photomultiplier tube and an image intensifier which are operable in parallel and simultaneously by means of a field lens assembly and an associated beam splitter. The image intensifier permits an operator to aim and focus the apparatus on a submerged fuel assembly. Once the instrument is aimed and focused, an illumination reading can be obtained with the photomultiplier tube. The instrument includes a lens cap with a carbon-14/phosphor light source for calibrating the apparatus in the field.
ERIC Educational Resources Information Center
Storm, Paula; Kelly, Robert; deVries, Susann
2008-01-01
People and organizations are inherently political. Library workplace environments have zones of tension and dynamics just like any corporation, often leading to the formation of political camps. These different cliques influence productivity and work-related issues and, at worst, give meetings the feel of the Camp David negotiations. Politics are…
Saberton, S
1990-05-01
The term "playing politics" usually brings to mind undesirable qualities such as manipulation, power abuse and overt self-interest. Yet politics is a constant in daily life and indeed is very necessary in gaining support for both personal and corporate projects. This article discusses how, through communication and leadership, political skills can be used to realize common goals in an organization.
Teaching Politically without Political Correctness.
ERIC Educational Resources Information Center
Graff, Gerald
2000-01-01
Discusses how to bring political issues into the classroom, highlighting the influence of local context and noting conservative and liberal criticisms of political correctness. Suggests the need for a different idea of how to teach politically from the advocacy pedagogy advanced by recent critical educators, explaining that bringing students into…
Testing distance duality with CMB anisotropies
NASA Astrophysics Data System (ADS)
Räsänen, Syksy; Väliviita, Jussi; Kosonen, Ville
2016-04-01
We constrain deviations of the form T propto (1+z)1+epsilon from the standard redshift-temperature relation, corresponding to modifying distance duality as DL = (1+z)2(1+epsilon) DA. We consider a consistent model, in which both the background and perturbation equations are changed. For this purpose, we introduce a species of dark radiation particles to which photon energy density is transferred, and assume epsilon >= 0. The Planck 2015 release high multipole temperature plus low multipole data give the limit epsilon < 4.5 × 10-3 at 95% C.L. The main obstacle to improving this CMB-only result is strong degeneracy between epsilon and the physical matter densities ωb and ωc. A constraint on deuterium abundance improves the limit to epsilon < 1.8 × 10-3. Adding the Planck high-multipole CMB polarisation and BAO data leads to a small improvement; with this maximal dataset we obtain epsilon < 1.3 × 10-3. This dataset constrains the present dark radiation energy density to at most 12% of the total photon plus dark radiation density. Finally, we discuss the degeneracy between dark radiation and the effective number of relativistic species Neff, and consider the impact of dark radiation perturbations and allowing epsilon < 0 on the results.
Disentangling the f(R)-duality
Broy, Benedict J.; Pedro, Francisco G.; Westphal, Alexander
2015-03-16
Motivated by UV realisations of Starobinsky-like inflation models, we study generic exponential plateau-like potentials to understand whether an exact f(R)-formulation may still be obtained when the asymptotic shift-symmetry of the potential is broken for larger field values. Potentials which break the shift symmetry with rising exponentials at large field values only allow for corresponding f(R)-descriptions with a leading order term R{sup n} with 1
Large N duality beyond the genus expansion
NASA Astrophysics Data System (ADS)
Mariño, Marcos; Pasquetti, Sara; Putrov, Pavel
2010-07-01
We study non-perturbative aspects of the large N duality between Chern-Simons theory and topological strings, and we find a rich structure of large N phase transitions in the complex plane of the 't Hooft parameter. These transitions are due to large N instanton effects, and they can be regarded as a deformation of the Stokes phenomenon. Moreover, we show that, for generic values of the 't Hooft coupling, instanton effects are not exponentially suppressed at large N and they correct the genus expansion. This phenomenon was first discovered in the context of matrix models, and we interpret it as a generalization of the oscillatory asymptotics along anti-Stokes lines. In the string dual, the instanton effects can be interpreted as corrections to the saddle string geometry due to discretized neighbouring geometries. As a mathematical application, we obtain the 1/ N asymptotics of the partition function of Chern-Simons theory on the lens space L(2, 1), and we test it numerically to high precision in order to exhibit the importance of instanton effects.
Wronskians, dualities and FZZT-Cardy branes
NASA Astrophysics Data System (ADS)
Chan, Chuan-Tsung; Irie, Hirotaka; Niedner, Benjamin; Yeh, Chi-Hsien
2016-09-01
The resolvent operator plays a central role in matrix models. For instance, with utilizing the loop equation, all of the perturbative amplitudes including correlators, the free-energy and those of instanton corrections can be obtained from the spectral curve of the resolvent operator. However, at the level of non-perturbative completion, the resolvent operator is generally not sufficient to recover all the information from the loop equations. Therefore it is necessary to find a sufficient set of operators which provide the missing non-perturbative information. In this paper, we study generalized Wronskians of the Baker-Akhiezer systems as a manifestation of these new degrees of freedom. In particular, we derive their isomonodromy systems and then extend several spectral dualities to these systems. In addition, we discuss how these Wronskian operators are naturally aligned on the Kac table. Since they are consistent with the Seiberg-Shih relation, we propose that these new degrees of freedom can be identified as FZZT-Cardy branes in Liouville theory. This means that FZZT-Cardy branes are the bound states of elemental FZZT branes (i.e. the twisted fermions) rather than the bound states of principal FZZT-brane (i.e. the resolvent operator).
NASA Astrophysics Data System (ADS)
Alexandrov, Sergei; Pioline, Boris
2012-08-01
In type IIB string compactifications on a Calabi-Yau threefold, the hypermultiplet moduli space {{M}_H} must carry an isometric action of the modular group SL(2 , {Z} ), inherited from the S-duality symmetry of type IIB string theory in ten dimensions. We investigate how this modular symmetry is realized at the level of the twistor space of {{M}_H} , and construct a general class of SL(2 , {Z} )-invariant quaternion-Kähler metrics with two commuting isometries, parametrized by a suitably covariant family of holomorphic transition functions. This family should include {{M}_H} corrected by D3-D1-D(-1)-instantons (with five-brane corrections ignored) and, after taking a suitable rigid limit, the Coulomb branch of five-dimensional {N} = {2} gauge theories compactified on a torus, including monopole string instantons. These results allow us to considerably simplify the derivation of the mirror map between type IIA and IIB fields in the sector where only D1-D(-1)-instantons are retained.
Disentangling the f(R)-duality
Broy, Benedict J.; Westphal, Alexander; Pedro, Francisco G. E-mail: francisco.pedro@desy.de
2015-03-01
Motivated by UV realisations of Starobinsky-like inflation models, we study generic exponential plateau-like potentials to understand whether an exact f(R)-formulation may still be obtained when the asymptotic shift-symmetry of the potential is broken for larger field values. Potentials which break the shift symmetry with rising exponentials at large field values only allow for corresponding f(R)-descriptions with a leading order term R{sup n} with 1
Testing distance duality with CMB anisotropies
NASA Astrophysics Data System (ADS)
Räsänen, Syksy; Väliviita, Jussi; Kosonen, Ville
2016-04-01
We constrain deviations of the form T propto (1+z)1+epsilon from the standard redshift-temperature relation, corresponding to modifying distance duality as DL = (1+z)2(1+epsilon) DA. We consider a consistent model, in which both the background and perturbation equations are changed. For this purpose, we introduce a species of dark radiation particles to which photon energy density is transferred, and assume epsilon >= 0. The Planck 2015 release high multipole temperature plus low multipole data give the limit epsilon < 4.5 × 10‑3 at 95% C.L. The main obstacle to improving this CMB-only result is strong degeneracy between epsilon and the physical matter densities ωb and ωc. A constraint on deuterium abundance improves the limit to epsilon < 1.8 × 10‑3. Adding the Planck high-multipole CMB polarisation and BAO data leads to a small improvement; with this maximal dataset we obtain epsilon < 1.3 × 10‑3. This dataset constrains the present dark radiation energy density to at most 12% of the total photon plus dark radiation density. Finally, we discuss the degeneracy between dark radiation and the effective number of relativistic species Neff, and consider the impact of dark radiation perturbations and allowing epsilon < 0 on the results.
Resch, Mária; Bella, Tamás
2013-04-21
In Hungary one can mostly find references to the psychological processes of politics in the writings of publicists, public opinion pollsters, philosophers, social psychologists, and political analysts. It would be still important if not only legal scientists focusing on political institutions or sociologist-politologists concentrating on social structures could analyse the psychological aspects of political processes; but one could also do so through the application of the methods of political psychology. The authors review the history of political psychology, its position vis-à-vis other fields of science and the essential interfaces through which this field of science, which is still to be discovered in Hungary, connects to other social sciences. As far as its methodology comprising psycho-biographical analyses, questionnaire-based queries, cognitive mapping of interviews and statements are concerned, it is identical with the psychiatric tools of medical sciences. In the next part of this paper, the focus is shifted to the essence and contents of political psychology. Group dynamics properties, voters' attitudes, leaders' personalities and the behavioural patterns demonstrated by them in different political situations, authoritativeness, games, and charisma are all essential components of political psychology, which mostly analyses psychological-psychiatric processes and also involves medical sciences by relying on cognitive and behavioural sciences. This paper describes political psychology, which is basically part of social sciences, still, being an interdisciplinary science, has several ties to medical sciences through psychological and psychiatric aspects.
Tests of quark-hadron duality in τ-decays
NASA Astrophysics Data System (ADS)
Dominguez, C. A.; Hernandez, L. A.; Schilcher, K.; Spiesberger, H.
2016-09-01
An exhaustive number of QCD finite energy sum rules for τ-decay together with the latest updated ALEPH data is used to test the assumption of global duality. Typical checks are the absence of the dimension d = 2 condensate, the equality of the gluon condensate extracted from vector or axial vector spectral functions, the Weinberg sum rules, the chiral condensates of dimensions d = 6 and d = 8, as well as the extraction of some low-energy parameters of chiral perturbation theory. Suitable pinched linear integration kernels are introduced in the sum rules in order to suppress potential quark-hadron duality violations and experimental errors. We find no compelling indications of duality violations in hadronic τ-decay in the kinematic region above s ≃ 2.2 GeV2 for these kernels.
Unification of type-II strings and T duality.
Hohm, Olaf; Kwak, Seung Ki; Zwiebach, Barton
2011-10-21
We present a unified description of the low-energy limits of type-II string theories. This is achieved by a formulation that doubles the space-time coordinates in order to realize the T-duality group O(10,10) geometrically. The Ramond-Ramond fields are described by a spinor of O(10,10), which couples to the gravitational fields via the Spin(10,10) representative of the so-called generalized metric. This theory, which is supplemented by a T-duality covariant self-duality constraint, unifies the type-II theories in that each of them is obtained for a particular subspace of the doubled space.
Unification of type-II strings and T duality.
Hohm, Olaf; Kwak, Seung Ki; Zwiebach, Barton
2011-10-21
We present a unified description of the low-energy limits of type-II string theories. This is achieved by a formulation that doubles the space-time coordinates in order to realize the T-duality group O(10,10) geometrically. The Ramond-Ramond fields are described by a spinor of O(10,10), which couples to the gravitational fields via the Spin(10,10) representative of the so-called generalized metric. This theory, which is supplemented by a T-duality covariant self-duality constraint, unifies the type-II theories in that each of them is obtained for a particular subspace of the doubled space. PMID:22107505
Fair sampling perspective on an apparent violation of duality.
Bolduc, Eliot; Leach, Jonathan; Miatto, Filippo M; Leuchs, Gerd; Boyd, Robert W
2014-08-26
In the event in which a quantum mechanical particle can pass from an initial state to a final state along two possible paths, the duality principle states that "the simultaneous observation of wave and particle behavior is prohibited" [Scully MO, Englert B-G, Walther H (1991) Nature 351:111-116]. Whereas wave behavior is associated with the observation of interference fringes, particle behavior generally corresponds to the acquisition of which-path information by means of coupling the paths to a measuring device or part of their environment. In this paper, we show how the consequences of duality change when allowing for biased sampling, that is, postselected measurements on specific degrees of freedom of the environment of the two-path state. Our work gives insight into a possible mechanism for obtaining simultaneous high which-path information and high-visibility fringes in a single experiment. Further, our results introduce previously unidentified avenues for experimental tests of duality.
New localization mechanism and Hodge duality for q -form field
NASA Astrophysics Data System (ADS)
Fu, Chun-E.; Liu, Yu-Xiao; Guo, Heng; Zhang, Sheng-Li
2016-03-01
In this paper, we investigate the problem of localization and the Hodge duality for a q -form field on a p -brane with codimension one. By a general Kaluza-Klein (KK) decomposition without gauge fixing, we obtain two Schrödinger-like equations for two types of KK modes of the bulk q -form field, which determine the localization and mass spectra of these KK modes. It is found that there are two types of zero modes (the 0-level modes): a q -form zero mode and a (q -1 )-form one, which cannot be localized on the brane at the same time. For the n -level KK modes, there are two interacting KK modes, a massive q -form KK mode and a massless (q -1 )-form one. By analyzing gauge invariance of the effective action and choosing a gauge condition, the n -level massive q -form KK mode decouples from the n -level massless (q -1 )-form one. It is also found that the Hodge duality in the bulk naturally becomes two dualities on the brane. The first one is the Hodge duality between a q -form zero mode and a (p -q -1 )-form one, or between a (q -1 )-form zero mode and a (p -q )-form one. The second duality is between two group KK modes: one is an n -level massive q -form KK mode with mass mn and an n -level massless (q -1 )-form mode; another is an n -level (p -q )-form one with the same mass mn and an n -level massless (p -q -1 )-form mode. Because of the dualities, the effective field theories on the brane for the KK modes of the two dual bulk form fields are physically equivalent.
The Plane-Wave/Super Yang-Mills Duality
Sadri, D
2003-10-14
We present a self-contained review of the Plane-wave/super-Yang-Mills duality, which states that strings on a plane-wave background are dual to a particular large R-charge sector of N=4, D=4 superconformal U(N) gauge theory. This duality is a specification of the usual AdS/CFT correspondence in the ''Penrose limit''. The Penrose limit of AdS{sub 5} S{sup 5} leads to the maximally supersymmetric ten dimensional plane-wave (henceforth the plane-wave) and corresponds to restricting to the large R-charge sector, the BMN sector, of the dual superconformal field theory. After assembling the necessary background knowledge, we state the duality and review some of its supporting evidence. We review the suggestion by 't Hooft that Yang-Mills theories with gauge groups of large rank might be dual to string theories and the realization of this conjecture in the form of the AdS/CFT duality. We discuss plane-waves as exact solutions of supergravity and their appearance as Penrose limits of other backgrounds, then present an overview of string theory on the plane-wave background, discussing the symmetries and spectrum. We then make precise the statement of the proposed duality, classify the BMN operators, and mention some extensions of the proposal. We move on to study the gauge theory side of the duality, studying both quantum and non-planar corrections to correlation functions of BMN operators, and their operator product expansion. The important issue of operator mixing and the resultant need for re-diagonalization is stressed. Finally, we study strings on the plane-wave via light-cone string field theory, and demonstrate agreement on the one-loop correction to the string mass spectrum and the corresponding quantity in the gauge theory. A new presentation of the relevant superalgebra is given.
Cambré, Sofie; Schoeters, Bob; Luyckx, Sten; Goovaerts, Etienne; Wenseleers, Wim
2010-05-21
Single-file transport of water into carbon nanotubes is experimentally demonstrated for the first time through the splitting of the radial breathing mode (RBM) vibration in Raman spectra of bile salt solubilized tubes when both empty (closed) and water-filled (open-ended) tubes are present. D2O filling is observed for a wide range of diameters, d, down to very thin tubes [e.g., (5,3) tube, d=0.548 nm] for which only a single water molecule fits in the cross section of the internal nanotube channel. The shift in RBM frequency upon filling is found to display a very complex dependence on nanotube diameter and chirality, in support of a different yet well-defined ordering and orientation of water molecules at room temperature. Large shifts of the electronic transitions are also observed.
Desai, P; Caroprese, B; McKellar, H
2014-06-01
Purpose: To illustrate 25% reduction in CyberKnife prostate SBRT treatment times using a water filled rectal balloon. Methods: We perform prostate SBRT using a 3800cGy in 4 fraction regimen prescribed between 51% 59% iso-dose lines to 95% of PTV using a CyberKnife System. The resultant heterogeneous dosimetry is analogous to HDR dosimetry. Our patients are treated in a feet first supine position to decrease treatment couch sag and also to position the prostate anatomy closer to the robot. CT imaging is performed with a Radiadyne Immobiloc rectal balloon filled with 45-50cc water placed firmly inside the patient's rectum. A treatment plan is developed from this CT study using Multiplan. The patient is treated every other day for 4 days using the rectal balloon for each fraction. Gold fiducials previously implanted inside the prostate are used for tracking by the CyberKnife system. Results: Critical structures comprise the usual GU anatomy of bladder, rectum, urethra, femoral-heads along with emphasis on doses to anterior rectal wall and rectal mucosa. The water filled rectal balloon localizes the rectum, which enables the physician to accurately contour both anterior rectal wall, and rectal mucosa. The balloon also has a gas release valve enabling better patient comfort. Rectum localization enables the CyberKnife system to make fewer corrections resulting in fewer treatment interruptions and time lost to re-adjustment for rectal motion, bowel filling and gas creation. Effective treatment times are reduced by 25% to approximately 45 minutes. Adoption of the balloon has required minimal change to our planning strategy and plan evaluation process. Conclusion: Patient follow-up comparisons show no difference in effectiveness of treatment with and without balloons We conclude that rectal balloons enhance patient comfort and decrease effective treatment times.
Thermodynamics of quasiconformal theories from gauge/gravity duality
Alanen, Janne; Kajantie, Keijo; Tuominen, Kimmo
2010-09-01
We use gauge/gravity duality to study the thermodynamics of a generic almost conformal theory, specified by its beta function. Three different phases are identified, a high temperature phase of massless partons, an intermediate quasiconformal phase and a low temperature confining phase. The limit of a theory with infrared fixed point, in which the coupling does not run to infinity, is also studied. The transitions between the phases are of first order or continuous, depending on the parameters of the beta function. The results presented follow from gauge/gravity duality; no specific boundary theory is assumed, only its beta function.
Thermal Duality and Hagedorn Transition from p-adic Strings
Biswas, Tirthabir; Cembranos, Jose A. R.; Kapusta, Joseph I.
2010-01-15
We develop the finite temperature theory of p-adic string models. We find that the thermal properties of these nonlocal field theories can be interpreted either as contributions of standard thermal modes with energies proportional to the temperature, or inverse thermal modes with energies proportional to the inverse of the temperature, leading to a thermal duality at leading order (genus one) analogous to the well-known T duality of string theory. The p-adic strings also recover the asymptotic limits (high and low temperature) for arbitrary genus that purely stringy calculations have yielded. We also discuss our findings surrounding the nature of the Hagedorn transition.
Thermal duality and Hagedorn transition from p-adic strings.
Biswas, Tirthabir; Cembranos, Jose A R; Kapusta, Joseph I
2010-01-15
We develop the finite temperature theory of p-adic string models. We find that the thermal properties of these nonlocal field theories can be interpreted either as contributions of standard thermal modes with energies proportional to the temperature, or inverse thermal modes with energies proportional to the inverse of the temperature, leading to a thermal duality at leading order (genus one) analogous to the well-known T duality of string theory. The p-adic strings also recover the asymptotic limits (high and low temperature) for arbitrary genus that purely stringy calculations have yielded. We also discuss our findings surrounding the nature of the Hagedorn transition.
Manifesting color-kinematics duality in the scattering equation formalism
NASA Astrophysics Data System (ADS)
Bjerrum-Bohr, N. E. J.; Bourjaily, Jacob L.; Damgaard, Poul H.; Feng, Bo
2016-09-01
We prove that the scattering equation formalism for Yang-Mills amplitudes can be used to make manifest the theory's color-kinematics duality. This is achieved through a concrete reduction algorithm which renders this duality manifest term-by-term. The reduction follows from the recently derived set of identities for amplitudes expressed in the scattering equation formalism that are analogous to monodromy relations in string theory. A byproduct of our algorithm is a generalization of the identities among gravity and Yang-Mills amplitudes.
Thermal duality and Hagedorn transition from p-adic strings.
Biswas, Tirthabir; Cembranos, Jose A R; Kapusta, Joseph I
2010-01-15
We develop the finite temperature theory of p-adic string models. We find that the thermal properties of these nonlocal field theories can be interpreted either as contributions of standard thermal modes with energies proportional to the temperature, or inverse thermal modes with energies proportional to the inverse of the temperature, leading to a thermal duality at leading order (genus one) analogous to the well-known T duality of string theory. The p-adic strings also recover the asymptotic limits (high and low temperature) for arbitrary genus that purely stringy calculations have yielded. We also discuss our findings surrounding the nature of the Hagedorn transition. PMID:20366584
ERIC Educational Resources Information Center
Gruber, Ryan; Wind, Andrew; Trevidi, Neema
2000-01-01
Presents four articles considering: (1) the media's role in the coverage of politics; (2) the influence of photography particularly in terms of the president; (3) an event where an Iowa student had a chance to work with professionals while covering politics; and (4) considering scholastic reporters covering national candidates as they learn and…
NASA Astrophysics Data System (ADS)
Lee, Taejin
2016-09-01
We study the dissipative Hofstadter model on a triangular lattice, making use of the O(2, 2; R) T-dual transformation of string theory. The O(2, 2; R) dual transformation transcribes the model in a commutative basis into the model in a noncommutative basis. In the zero-temperature limit, the model exhibits an exact duality, which identifies equivalent points on the two-dimensional parameter space of the model. The exact duality also defines magic circles on the parameter space, where the model can be mapped onto the boundary sine-Gordon on a triangular lattice. The model describes the junction of three quantum wires in a uniform magnetic field background. An explicit expression of the equivalence relation, which identifies the points on the two-dimensional parameter space of the model by the exact duality, is obtained. It may help us to understand the structure of the phase diagram of the model.
Duality of female employment in Pakistan.
Kazi, S; Raza, B
1991-01-01
The trends in the level and pattern of women's employment in Pakistan in terms of supply and demand factors which influence women's participation in the labor market are discussed. Women's labor participation is underestimated in official sources such as the Labor Force Survey (LFS) and the Population Census. Figures which were obtained from micro level surveys and the Agricultural Census, show the duality of employment at the top and bottom socioeconomically. LFS data show the female share of the professional work force to have risen from 15.5% to 18.3% between 1984-95 and 1987-88, which translates to 33% of teachers and 25% of physicians being women. Urban female participation rates have increased only slightly from 3 to 5% between 1971 and 72 and 1987-88, based on LFS data, while informal sector surveys have shown an increase of workers who are women who have never worked before in the formal sector. In manufacturing, the female work force remains low at 5% in factories in the Punjab and Sindh, but only 20% were in regular employment compared with 50% of men. Agricultural work on the family farm has increased from 35% in 1972 and 42% in 1980. Increases are also shown in more recent LF surveys. Constraints on both male and female employment are the recent (1978-79 and 1986-87) shift to capital investment in agriculture with tubewells and tractors and in manufacturing. Women's movement into agriculture may be precipitated by men's out migration to urban areas or the Gulf region into other nonfarm occupations. In manufacturing there is exploitation of workers through low overhead costs of temporary or part time help. Supply constraints for women involve cultural restrictions, household responsibilities, and low levels of education and skills. Women enter the work force out of financial need. Data on female-headed households are scarce, but a Karachi survey finds that most female-headed households belong to the poorest strata and women work when family size
Political News and Political Consciousness
ERIC Educational Resources Information Center
Schertges, Claudia
2007-01-01
This article deals with mass media in modern democratic societies, using the example of Israeli news reports in German television (TV) news. Central to this interest are processes of mediating politics: political socialisation and education; that is to say, empowering citizens via TV news to participate in democratic processes. The article…
NASA Astrophysics Data System (ADS)
Paterson, Matthew
2006-11-01
The car, and the range of social and political institutions which sustain its dominance, play an important role in many of the environmental problems faced by contemporary society. But in order to understand the possibilities for moving towards sustainability and 'greening cars', it is first necessary to understand the political forces that have made cars so dominant. This book identifies these forces as a combination of political economy and cultural politics. From the early twentieth century, the car became central to the organization of capitalism and deeply embedded in individual identities, providing people with a source of value and meaning but in a way which was broadly consistent with social imperatives for mobility. Projects for sustainability to reduce the environmental impacts of cars are therefore constrained by these forces but must deal with them in order to shape and achieve their goals. Addresses the increasingly controversial debate on the place of the car in contemporary society and its contribution to environmental problems Questions whether automobility is sustainable and what political, social and economic forces might prevent this Will appeal to scholars and advanced students from a wide range of disciplines including environmental politics, political economy, environmental studies, cultural studies and geography
Nonlinear electromagnetic self-duality and Legendre transformations
Gaillard, M.K.; Zumino, B.
1997-12-09
We discuss continuous duality transformations and the properties of classical theories with invariant interactions between electromagnetic fields and matter. The case of scalar fields is treated in some detail. Special discrete elements of the continuous group are shown to be related to the Legendre transformation with respect to the field strengths.
Duality in entanglement of macroscopic states of light
NASA Astrophysics Data System (ADS)
Lee, Su-Yong; Lee, Chang-Woo; Kurzyński, Paweł; Kaszlikowski, Dagomir; Kim, Jaewan
2016-08-01
We investigate duality in entanglement of a bipartite multiphoton system generated from a coherent state of light. The system can exhibit polarization entanglement if the two parts are distinguished by their parity, or parity entanglement if the parts are distinguished by polarization. It was shown in Phys. Rev. Lett. 110, 140404 (2013), 10.1103/PhysRevLett.110.140404 that this phenomenon can be exploited as a method to test indistinguishability of two particles and it was conjectured that one can also test indistinguishability of macroscopic systems. We propose a setup to test this conjecture. Contrary to the previous studies using two-particle interference effect as in the Hong-Ou- Mandel setup, our setup neither assumes that the tested state is composed of single particles nor requires that the total number of particles be fixed. Consequently, the notion of entanglement duality is shown to be compatible with a broader class of physical systems. Moreover, by observing duality in entanglement in the above system one can confirm that macroscopic systems exhibit quantum behavior. As a practical side, entanglement duality is a useful concept that enables adaptive conversion of entanglement of one degree of freedom (DOF) to that of another DOF according to varying quantum protocols.
Berger, T; Hajek, M; Schöner, W; Fugger, M; Vana, N; Akatov, Y; Shurshakov, V; Arkhangelsky, V; Kartashov, D
2002-01-01
A water-filled tissue equivalent phantom with a diameter of 35 cm was developed at the Institute for Biomedical Problems. Moscow. Russia. It contains four channels perpendicular to each other, where dosemeters can be exposed at different depths. Between May 1997 and February 1999 the phantom was installed at three different locations on board the Mir space station. Thermoluminescence dosemeters (TLDs) were exposed at various depths inside the phantom either parallel or perpendicular to the hull of the spacecraft. The high-temperature ratio (HTR) method was used for the evaluation of the TLDs. The method was developed at the Atominstitute of the Austrian Universities. Vienna, Austria, and has already been used for measurements in mixed radiation fields on earth and in space with great success. It uses the changes of peak height ratios in LiF:Mg,Ti glow curves in dependence on the linear energy transfer (LET), and therefore allows determination of an 'averaged' LET as well as measurement of the absorbed dose. A mean quality factor and, subsequently, the dose equivalent can be calculated according to the Q(LETinfinity) relationship proposed by the ICRP. The small size of the LiF dosemeters means that the HTR method can be used to determine the gradient of absorbed dose and dose equivalent inside the tissue equivalent body. PMID:12382930
Sarman, I
1992-01-01
Body temperatures, heart rates and resting oxygen consumptions were examined during routine nursing care in 12 premature babies treated alternately in incubators or on a heated, water-filled mattress (HWM). The mean temperatures were significantly higher in the axilla (0.3 degree C; p less than or equal to 0.05) and the foot (1.4 degrees C; p less than 0.001) during HWM care. The degree of maximal fall in various body temperatures during routine nursing procedures was the same for both treatments, whereas the time taken for the foot temperature to fall was 13 min shorter during HWM care (p less than 0.001). The proportion of heart rates below 160 bpm when the babies were not disturbed was 7.4% greater during HWM treatment (p less than 0.01). The resting oxygen consumption in babies treated on HWM was slightly lower (6.2 +/- 0.4 vs 6.4 +/- 0.5 ml/kg/min; p less than 0.05). Treatment on the HWM seems to promote calm and comfort, since it reduces the amount of thermal stress and prolongs quiet resting periods.
How Internal Political Efficacy Translates Political Knowledge Into Political Participation
Reichert, Frank
2016-01-01
This study presents evidence for the mediation effect of political knowledge through political self-efficacy (i.e. internal political efficacy) in the prediction of political participation. It employs an action theoretic approach—by and large grounded on the Theory of Planned Behaviour—and uses data from the German Longitudinal Election Study to examine whether political knowledge has distinct direct effects on voting, conventional, and/or unconventional political participation. It argues that political knowledge raises internal political efficacy and thereby indirectly increases the chance that a citizen will participate in politics. The results of mediated multiple regression analyses yield evidence that political knowledge indeed translates into internal political efficacy, thus it affects political participation of various kinds indirectly. However, internal political efficacy and intentions to participate politically yield simultaneous direct effects only on conventional political participation. Sequentially mediated effects appear for voting and conventional political participation, with political knowledge being mediated by internal political efficacy and subsequently also by behavioural intentions. The mediation patterns for unconventional political participation are less clear though. The discussion accounts for restrictions of this study and points to questions for answer by future research. PMID:27298633
Supersymmetry and non-Abelian T-duality in type II supergravity
NASA Astrophysics Data System (ADS)
Kelekci, Özgür; Lozano, Yolanda; Macpherson, Niall T.; Colgáin, Eoin Ó.
2015-02-01
We study the effect of T-duality on supersymmetry in the context of type II supergravity. For both U(1) Abelian and SU(2) non-Abelian T-duality, we demonstrate that the supersymmetry variations after T-duality are related to the variations before T-duality through the Kosmann spinorial Lie derivative, which vanishes when the Killing spinors are independent of the T-duality directions. As a byproduct of our analysis, we present closed expressions for SU(2) T-duality in a class of spacetimes with diagonal Bianchi IX symmetry and comment on specific examples of T-dual geometries, including a novel AdS3 geometry with large N=(4,4) superconformal symmetry.
a 2d Integrable Axion Model and Target Space Duality
NASA Astrophysics Data System (ADS)
Forgács, Péter
2001-04-01
A review is given on the recently proposed two dimensional axion model (O(3) σ-model with a dynamical θ-term) and the T-duality relating it to the SU(2)×U(1) symmetric anisotropic σ-model. The T-duality transformation leads to a new Lax-pair. Strong evidence is presented for the correctness of the proposed S-matrix for both models comparing perturbative and Thermodynamical Bethe Ansatz calculations for different types of free energies. The quantum non-integrability of the O(3) σ-model with a constant θ-term, in contradistinction to the axion model, is illustrated by calculating the 2 → 3 particle production amplitude to lowest order in θ
How to observe duality in entanglement of two distinguishable particles
NASA Astrophysics Data System (ADS)
Karczewski, Marcin; Kurzyński, Paweł
2016-09-01
The entanglement between two bosons or fermions can be accessed if there exists an auxiliary degree of freedom which can be used to label and effectively distinguish the two particles. For some types of entanglement between two indistinguishable particles one can observe a duality, i.e., if the entanglement is present in a Hilbert space H and an auxiliary Hilbert space H' is used to label the particles, then if we use H as a label, entanglement will be present in H'. For distinguishable particles this effect does not occur because of superselection rules which prevent superpositions of different types of particles. However, it is known that superselection rules can be bypassed if one uses special auxiliary states that are known as reference frames. Here we study properties of reference frames which allow for the observation of a duality in entanglement between two distinguishable particles. Finally, we discuss the consequences of this result from a resource-theoretic point of view.
Critical interfaces and duality in the Ashkin-Teller model
Picco, Marco; Santachiara, Raoul
2011-06-15
We report on the numerical measures on different spin interfaces and Fortuin-Kasteleyn (FK) cluster boundaries in the Askhin-Teller (AT) model. For a general point on the AT critical line, we find that the fractal dimension of a generic spin cluster interface can take one of four different possible values. In particular we found spin interfaces whose fractal dimension is d{sub f}=3/2 all along the critical line. Furthermore, the fractal dimension of the boundaries of FK clusters was found to satisfy all along the AT critical line a duality relation with the fractal dimension of their outer boundaries. This result provides clear numerical evidence that such duality, which is well known in the case of the O(n) model, exists in an extended conformal field theory.
Generalized entropies and logarithms and their duality relations
Hanel, Rudolf; Thurner, Stefan; Gell-Mann, Murray
2012-01-01
For statistical systems that violate one of the four Shannon–Khinchin axioms, entropy takes a more general form than the Boltzmann–Gibbs entropy. The framework of superstatistics allows one to formulate a maximum entropy principle with these generalized entropies, making them useful for understanding distribution functions of non-Markovian or nonergodic complex systems. For such systems where the composability axiom is violated there exist only two ways to implement the maximum entropy principle, one using escort probabilities, the other not. The two ways are connected through a duality. Here we show that this duality fixes a unique escort probability, which allows us to derive a complete theory of the generalized logarithms that naturally arise from the violation of this axiom. We then show how the functional forms of these generalized logarithms are related to the asymptotic scaling behavior of the entropy. PMID:23129618
Vortex operator and BKT transition in Abelian duality
NASA Astrophysics Data System (ADS)
Chern, Tong
2016-04-01
We give a new simple derivation for the sine-Gordon description of Berezinskii-Kosterlitz-Thouless (BKT) phase transition. Our derivation is simpler than traditional derivations. Besides, our derivation is a continuous field theoretic derivation by using path integration, different from the traditional derivations which are based on lattice theory or based on Coulomb gas model. Our new derivation relies on Abelian duality of two dimensional quantum field theory. By utilizing this duality in path integration, we find that the vortex configurations are naturally mapped to exponential operators in dual description. Since these operators are the vortex operators that can create vortices, the sine-Gordon description then naturally follows. Our method may be useful for the investigation to the BKT physics of superconductors.
Quark-Hadron Duality in Neutron (3He) Spin Structure
Solvignon, Patricia; Liyanage, Nilanga; Chen, Jian-Ping; Choi, Seonho; Aniol, Konrad; Averett, Todd; Boeglin, Werner; Camsonne, Alexandre; Cates, Gordon; Chang, C.; Chang, C.C.; Chang, C.; Chang, C.C.; Chudakov, Eugene; Craver, Brandon; Cusanno, Francesco; Deur, Alexandre; Dutta, Dipangkar; Ent, Rolf; Feuerbach, Robert; Frullani, Salvatore; Gao, Haiyan; Garibaldi, Franco; Gilman, Ronald; Glashausser, Charles; Gorbenko, Viktor; Hansen, Jens-Ole; Higinbotham, Douglas; Ibrahim, Hassan; Jiang, Xiaodong; Jones, Mark; Kelleher, Aidan; Kelly, J.; Keppel, Cynthia; Kim, Wooyoung; Korsch, Wolfgang; Kramer, Kevin; Kumbartzki, Gerfried; LeRose, John; Lindgren, Richard; Ma, Bin; Margaziotis, Demetrius; Markowitz, Pete; McCormick, Kathy; Meziani, Zein-Eddine; Michaels, Robert; Moffit, Bryan; Monaghan, Peter; Munoz-Camacho, Carlos; Paschke, Kent; Reitz, Bodo; Saha, Arunava; Sheyor, Ran; Singh, Jaideep; Slifer, Karl; Sulkosky, Vince; Sulkosky, Vincent; Sulkosky, Vince; Sulkosky, Vincent; Tobias, William; Urciuoli, Guido; Wang, Kebin; Wijesooriya, Krishni; Wojtsekhowski, Bogdan; Woo, Seungtae; Yang, Jae-Choon; Zheng, Xiaochao; Zhu, Lingyan
2008-10-01
We present experimental results of the first high-precision test of quark-hadron duality in the spin-structure function g_1 of the neutron and $^3$He using a polarized 3He target in the four-momentum-transfer-squared range from 0.7 to 4.0 (GeV/c)^2. Global duality is observed for the spin-structure function g_1 down to at least Q^2 = 1.8 (GeV/c)^2 in both targets. We have also formed the photon-nucleon asymmetry A_1 in the resonance region for 3He and found no strong Q^2-dependence above 2.2 (GeV/c)^2.
Generalized entropies and logarithms and their duality relations.
Hanel, Rudolf; Thurner, Stefan; Gell-Mann, Murray
2012-11-20
For statistical systems that violate one of the four Shannon-Khinchin axioms, entropy takes a more general form than the Boltzmann-Gibbs entropy. The framework of superstatistics allows one to formulate a maximum entropy principle with these generalized entropies, making them useful for understanding distribution functions of non-Markovian or nonergodic complex systems. For such systems where the composability axiom is violated there exist only two ways to implement the maximum entropy principle, one using escort probabilities, the other not. The two ways are connected through a duality. Here we show that this duality fixes a unique escort probability, which allows us to derive a complete theory of the generalized logarithms that naturally arise from the violation of this axiom. We then show how the functional forms of these generalized logarithms are related to the asymptotic scaling behavior of the entropy.
Overcoming obstacles to colour-kinematics duality at two loops
NASA Astrophysics Data System (ADS)
Mogull, Gustav; O'Connell, Donal
2015-12-01
The discovery of colour-kinematics duality has allowed great progress in our understanding of the UV structure of gravity. However, it has proven difficult to find numerators which satisfy colour-kinematics duality in certain cases. We discuss obstacles to building a set of such numerators in the context of the five-gluon amplitude with all helicities positive at two loops. We are able to overcome the obstacles by adding more loop momentum to our numerator to accommodate tension between the values of certain cuts and the symmetries of certain diagrams. At the same time, we maintain control over the size of our ansatz by identifying a highly constraining but desirable symmetry property of our master numerator. The resulting numerators have twelve powers of loop momenta rather than the seven one would expect from the Feynman rules.
The Onset of Quark-Hadron Duality in Pion Electroproduction
Tigran Navasardyan; Gary Adams; Abdellah Ahmidouch; Tatiana Angelescu; John Arrington; Razmik Asaturyan; O. Baker; Nawal Benmouna; Crystal Bertoncini; Henk Blok; Werner Boeglin; Peter Bosted; Herbert Breuer; Michael Christy; Simon Connell; Yonggang Cui; Mark Dalton; Samuel Danagoulian; Donal Day; T. Dodario; James Dunne; Dipangkar Dutta; Najib Elkhayari; Rolf Ent; Howard Fenker; Valera Frolov; Liping Gan; David Gaskell; Kawtar Hafidi; Wendy Hinton; Roy Holt; Tanja Horn; Garth Huber; Ed Hungerford; Xiaodong Jiang; Mark Jones; Kyungseon Joo; Narbe Kalantarians; James Kelly; Cynthia Keppel; Edward Kinney; V. Kubarovski; Ya Li; Yongguang Liang; Simona Malace; Pete Markowitz; Erin McGrath; Daniella Mckee; David Meekins; Hamlet Mkrtchyan; Brian Moziak; Gabriel Niculescu; Maria-Ioana Niculescu; Allena Opper; Tanya Ostapenko; Paul Reimer; Joerg Reinhold; Julie Roche; Stephen Rock; Elaine Schulte; Edwin Segbefia; C. Smith; G.R. Smith; Paul Stoler; Vardan Tadevosyan; Liguang Tang; Maurizio Ungaro; Alicia Uzzle; Sandra Vidakovic; Anthony Villano; William Vulcan; Miao Wang; Glen Warren; Frank Wesselmann; Bogdan Wojtsekhowski; Stephen Wood; Chuncheng Xu; Lulin Yuan; Xiaochao Zheng; Hong Guo Zhu
2006-08-29
A large data set of charged-pion electroproduction from both hydrogen and deuterium targets has been obtained spanning the low-energy residual-mass region. These data conclusively show the onset of the quark-hadron duality phenomenon, as predicted for high-energy hadron electroproduction. We construct several ratios from these data to exhibit the relation of this phenomenon to the high-energy factorization ansatz of electron-quark scattering and subsequent quark-to- pion production mechanisms.
A Derivation of the Etherington's Distance-Duality Equation
NASA Astrophysics Data System (ADS)
Heymann, Yuri
2015-07-01
The Etherington's distance-duality equation is the relationship between the luminosity distance of standard candles and the angular-diameter distance. This relationship has been validated from astronomical observations based on the X-ray surface brightness and the Sunyaev-Zel'dovich effect of galaxy clusters. In the present study, we propose a derivation of the Etherington's reciprocity relation in the dichotomous cosmology.
Electric-magnetic duality and the geometric Langlands program
NASA Astrophysics Data System (ADS)
Kapustin, Anton; Witten, Edward
The geometric Langlands program can be described in a natural way bycompactifying on a Riemann surface C a twisted version of EUN=4 super Yang-Mills theory in four dimensions. The keyingredients are electric-magnetic duality of gauge theory, mirrorsymmetry of sigma-models, branes, Wilson and 't Hooft operators,and topological field theory. Seemingly esoteric notions of thegeometric Langlands program, such as Hecke eigensheaves and D-modules, arise naturally from the physics.
Solution of coupled and singular perturbation methods using duality theory.
NASA Technical Reports Server (NTRS)
Chan, W. L.; Leininger, G. G.
1973-01-01
Dual variational techniques developed by Chan and Leininger (1972) are summarized, and duality theory in the form of the Complementary Variational Principle is employed to provide a suboptimal measure for the singular and epsilon-coupled perturbation methods proposed by Kokotovic and Cruz. The suboptimal measure is independent of any a priori knowledge of the optimal solution, thereby providing an absolute estimate of the performance loss rather than an estimate relative to the unknown optimal solution.
Complementary variational principle and duality in mathematical programming.
NASA Technical Reports Server (NTRS)
Chan, W. L.; Leininger, G. G.; Farison, J. B.
1973-01-01
The relationship between the complementary variational principle and duality in mathematical programming is demonstrated through a geometric approach in a Hilbert space setting. A necessary and sufficient condition for the existence of such a principle is given in the case of a convex functional constrained by linear dynamics. Its relationship to the Kuhn-Tucker saddle point theory is indicated. Applications to various programming and control problems are discussed.
Rowlands' Duality Principle: A Generalization of Noether's Theorem?
NASA Astrophysics Data System (ADS)
Karam, Sabah E.
This paper will examine a physical principle that has been used in making valid predictions and generalizes established conservation laws. In a previous paper it was shown how Rowlands' zero-totality condition could be viewed as a generalization of Newton's third law of motion. In this paper it will be argued that Rowlands' Duality Principle is a generalization of Noether's Theorem and that the two principles taken together are truly foundational principles that have tamed Metaphysics.
The onset of quark-hadron duality in pion electroproduction.
Navasardyan, T.; Adams, G. S.; Ahnidouch, A.; Angelescu, T.; Arrington, T.; Arrington, J.; Hafidi, K.; Holt, R. J.; Reimer, P.; Schulte, E.; Zheng, X.; Physics; Yerevan Physics Inst.; Rensselaer Polytechnic Inst.; North Carolina A & T Univ.; Bucharest Univ.
2007-01-01
A large data set of charged-pion ({pi}*) electroproduction from both hydrogen and deuterium targets has been obtained spanning the low-energy residual-mass region. These data conclusively show the onset of the quark-hadron duality phenomenon, as predicted for high-energy hadron electroproduction. We construct several ratios from these data to exhibit the relation of this phenomenon to the high-energy factorization ansatz of electron-quark scattering and subsequent quark {yields} pion production mechanisms.
How overdetermined are the generalized self-duality relations?
NASA Astrophysics Data System (ADS)
Tchrakian, D. H.; Chakrabarti, A.
1991-09-01
It is shown that the self-duality equations of the generalized Yang-Mills (GYM) models are overdetermined except when they are subjected to the spherical or axial symmetry. It is also found that the Bogomol'nyi equations on Rd, of the GYM-Higgs (GYM-H) models descended from the GYM system on Rd×S8-d, are overdetermined for d=3,4,5, and 6 only.
Dualities in the analysis of phage DNA packaging motors
Serwer, Philip; Jiang, Wen
2012-01-01
The DNA packaging motors of double-stranded DNA phages are models for analysis of all multi-molecular motors and for analysis of several fundamental aspects of biology, including early evolution, relationship of in vivo to in vitro biochemistry and targets for anti-virals. Work on phage DNA packaging motors both has produced and is producing dualities in the interpretation of data obtained by use of both traditional techniques and the more recently developed procedures of single-molecule analysis. The dualities include (1) reductive vs. accretive evolution, (2) rotation vs. stasis of sub-assemblies of the motor, (3) thermal ratcheting vs. power stroking in generating force, (4) complete motor vs. spark plug role for the packaging ATPase, (5) use of previously isolated vs. new intermediates for analysis of the intermediate states of the motor and (6) a motor with one cycle vs. a motor with two cycles. We provide background for these dualities, some of which are under-emphasized in the literature. We suggest directions for future research. PMID:23532204
Trigonometric version of quantum-classical duality in integrable systems
NASA Astrophysics Data System (ADS)
Beketov, M.; Liashyk, A.; Zabrodin, A.; Zotov, A.
2016-02-01
We extend the quantum-classical duality to the trigonometric (hyperbolic) case. The duality establishes an explicit relationship between the classical N-body trigonometric Ruijsenaars-Schneider model and the inhomogeneous twisted XXZ spin chain on N sites. Similarly to the rational version, the spin chain data fixes a certain Lagrangian submanifold in the phase space of the classical integrable system. The inhomogeneity parameters are equal to the coordinates of particles while the velocities of classical particles are proportional to the eigenvalues of the spin chain Hamiltonians (residues of the properly normalized transfer matrix). In the rational version of the duality, the action variables of the Ruijsenaars-Schneider model are equal to the twist parameters with some multiplicities defined by quantum (occupation) numbers. In contrast to the rational version, in the trigonometric case there is a splitting of the spectrum of action variables (eigenvalues of the classical Lax matrix). The limit corresponding to the classical Calogero-Sutherland system and quantum trigonometric Gaudin model is also described as well as the XX limit to free fermions.
New dualities from orientifold transitions Part II: string theory
NASA Astrophysics Data System (ADS)
García-Etxebarria, Iñaki; Heidenreich, Ben; Wrase, Timm
2013-10-01
We present a string theoretical description, given in terms of branes and orientifolds wrapping vanishing cycles, of the dual pairs of gauge theories analyzed in [1]. Based on the resulting construction we argue that the duality that we observe in field theory is inherited from S-duality of type IIB string theory. We analyze in detail the complex cone over the zeroth del Pezzo surface and discuss an infinite family of orbifolds of flat space. For the del Pezzo case we describe the system in terms of large volume objects, and show that in this language the duality can be understood from the strongly coupled behavior of the O7+ plane, which we analyze using simple F-theory considerations. For all cases we also give a different argument based on the existence of appropriate torsional components of the 3-form flux lattice. Along the way we clarify some aspects of the description of orientifolds in the derived category of coherent sheaves, and in particular we discuss the important role played by exotic orientifolds — ordinary orientifolds composed with auto-equivalences of the category — when describing orientifolds of ordinary quiver gauge theories.
U-duality transformation of membrane on Tn revisited
NASA Astrophysics Data System (ADS)
Hu, Shan; Li, Tianjun
2016-08-01
The problem with the U-duality transformation of membrane on T n is recently addressed in [arXiv:1509.02915]. We will consider the U-duality transformation rule of membrane on T n × R. It turns out that winding modes on T n should be taken into account, since the duality transformation may bring the membrane configuration without winding modes into the one with winding modes. With the winding modes added, the membrane worldvolume theory in lightcone gauge is equivalent to the n + 1 dimensional super-Yang-Mills (SYM) theory in {tilde{T}}^n , which has SL(2 , Z) × SL(3 , Z) and SL(5 , Z) symmetries for n = 3 and n = 4, respectively. The SL(2 , Z) × SL(3 , Z) transformation can be realized classically, making the on-shell field configurations transformed into each other. However, the SL(5 , Z) symmetry may only be realized at the quantum level, since the classical 5 d SYM field configurations cannot form the representation of SL(5 , Z).
Fair sampling perspective on an apparent violation of duality
Bolduc, Eliot; Leach, Jonathan; Miatto, Filippo M.; Leuchs, Gerd; Boyd, Robert W.
2014-01-01
In the event in which a quantum mechanical particle can pass from an initial state to a final state along two possible paths, the duality principle states that “the simultaneous observation of wave and particle behavior is prohibited” [Scully MO, Englert B-G, Walther H (1991) Nature 351:111–116]. Whereas wave behavior is associated with the observation of interference fringes, particle behavior generally corresponds to the acquisition of which-path information by means of coupling the paths to a measuring device or part of their environment. In this paper, we show how the consequences of duality change when allowing for biased sampling, that is, postselected measurements on specific degrees of freedom of the environment of the two-path state. Our work gives insight into a possible mechanism for obtaining simultaneous high which-path information and high-visibility fringes in a single experiment. Further, our results introduce previously unidentified avenues for experimental tests of duality. PMID:25114237
AdS black holes from duality in gauged supergravity
NASA Astrophysics Data System (ADS)
Halmagyi, Nick; Vanel, Thomas
2014-04-01
We study and utilize duality transformations in a particular STU-model of four dimensional gauged supergravity. This model is a truncation of the de Wit-Nicolai =8 theory and as such has a lift to eleven-dimensional supergravity on the seven-sphere. Our duality group is U(1)3 and while it can be applied to any solution of this theory, we consider known asymptotically AdS4, supersymmetric black holes and focus on duality transformations which preserve supersymmetry. For static black holes we generalize the supersymmetric solutions of Cacciatori and Klemm from three magnetic charges to include two additional electric charges and argue that this is co-dimension one in the full space of supersymmetric static black holes in the STU-model. These new static black holes have nontrivial profiles for axions. For rotating black holes, we generalize the known two-parameter supersymmetric solution to include an additional parameter. When lifted to M-theory, these black holes correspond to the near horizon geometry of a stack of BPS rotating M2-branes, spinning on an S 7 which is fibered non-trivially over a Riemann surface.
S-duality in 3D gravity with torsion
Mielke, Eckehard W. . E-mail: ekke@xanum.uam.mx; Maggiolo, Ali A. Rincon
2007-02-15
The deformation of the connection in three spacetime dimensions by the kinematically equivalent coframe is shown to induce a duality between the (Lorentz-) rotational and translational field momenta, for which the coupling to the deformation parameter is inverted. This new kind of strong/weak duality, pertinent to 3D, is instrumental for studying exact solutions of the 3D Poincare gauge field equations and the particle content of propagating modes on a background of constant curvature. For a topological Chern-Simons model of gravity, the propagating modes 'living' on an Anti-de Sitter (AdS) background correspond to real massive particles. Yang-Mills type generalizations and new cubic Lagrangians are found and completely classified in 3D. AdS or black hole type solutions with constant axial torsion emerge, also for these higher-order Lagrangians with new 'exotic' torsion-curvature couplings. Their pattern complies with our S-duality, with new repercussions for the field redefinition of the metric in 3D quantum gravity and the cosmological constant problem.
NASA Technical Reports Server (NTRS)
Lucas, W. R.
1972-01-01
Certain decisions, problems, and successes are selected to recall the great impact of the 1950s on the history of rocketry, and particularly the inauguration of the space age. In reviewing the history of the Redstone, Juno, and Jupiter, some of the largest stepping stones to space, problems stand out in three areas: technical or engineering, management, and political.
ERIC Educational Resources Information Center
Maslow, Abraham
1977-01-01
This article expresses some last thoughts from Abraham Maslow on his vision of humanistic psychology. He suggests that the two main problems of creating the good person and the good society are interwoven inextricably. He gives some social and political mechanisms which would enhance desirable personal growth and considers the main tasks of…
ERIC Educational Resources Information Center
Brown, William R.
The internal politics of colleges and the influence of a current emphasis on efficiency on the traditional independence of the academician are analyzed. It is suggested that the academician does not work in the same differentiated, and therefore interdependent, way as someone in industry or a bureaucracy. Academic activity is segmented, which…
The conditions for the preservation of duality symmetry in a linear medium
NASA Astrophysics Data System (ADS)
van Kruining, Koen; Götte, Jörg B.
2016-08-01
Electric magnetic duality symmetry is well understood in vacuum. For light propagating through a medium this symmetry is typically broken. We investigate under what conditions duality symmetry is preserved in a linear medium and employ these conditions to generalise the definition of optical helicity to a general linear medium. We will discuss some unique properties duality symmetric media possess, provided they exist, and reformulate Maxwell’s equation in such a way that they explicitly show the decoupling of opposite helicities. The feasibility of constructing a duality symmetric medium is discussed.
Spectral dualities in XXZ spin chains and five dimensional gauge theories
NASA Astrophysics Data System (ADS)
Mironov, A.; Morozov, A.; Runov, B.; Zenkevich, Y.; Zotov, A.
2013-12-01
Motivated by recent progress in the study of supersymmetric gauge theories we propose a very compact formulation of spectral duality between XXZ spin chains. The action of the quantum duality is given by the Fourier transform in the spectral parameter. We investigate the duality in various limits and, in particular, prove it for q → 1, i.e. when it reduces to the XXX/Gaudin duality. We also show that the universal difference operators are given by the normal ordering of the classical spectral curves.
Ptatscheck, Christoph; Traunspurger, Walter
2015-01-01
Objectives In this study we investigated the dynamics of meiofaunal and macrofaunal communities in artificial water-filled tree holes. The abundances and, for the first time, biomasses and secondary production rates of these communities were examined. The experimental set-up consisted of 300 brown plastic cups placed in temperate mixed forests and sampled five times over a period of 16 months to determine the impact of (i) seasonal events, (ii) physicochemical parameters, and (iii) food resources on the tree hole metazoans. Outcomes Metazoan organisms, especially the meiofauna (rotifers and nematodes) occupied nearly all of the cups (> 99%) throughout the year. Between 55% and 99% of the metazoan community was represented by rotifers (max. 557,000 individuals 100 cm-2) and nematodes (max. 58,000 individuals 100 cm-2). Diptera taxa, particularly Dasyhelea sp. (max. 256 individuals 100 cm-2) dominated the macrofaunal community. Macrofauna accounted for the majority of the metazoan biomass, with a mean dry weight of 5,800 μg 100 cm-2 and an annual production rate of 20,400 μg C 100 cm-2, whereas for meiofauna mean biomass and annual production were 100 μg 100 cm-2 and 5,300 μg C 100 cm-2, respectively. The macrofaunal taxa tended to show more fluctuating population dynamic while the meiofaunal dynamic was rather low with partly asynchronous development. Seasonality (average temperature and rain intervals) had a significant impact on both meiofauna and macrofauna. Furthermore, bottom-up control (chlorophyll-a and organic carbon), mainly attributable to algae, was a significant factor that shaped the metazoan communities. In contrast, physicochemical water parameters had no evident influence. 23.7% of organism density distribution was explained by redundancy analysis (RDA) indicating a high dynamic and asynchrony of the systems. PMID:26284811
Dualities and Curved Space Partition Functions of Supersymmetric Theories
NASA Astrophysics Data System (ADS)
Agarwal, Prarit
In this dissertation we discuss some conjectured dualities in supersymmetric field theories and provide non-trivial checks for these conjectures. A quick review of supersymmetry and related topics is provided in chapter 1. In chapter 2, we develop a method to identify the so called BPS states in the Hilbert space of a supersymmetric field theory (that preserves at least two real supercharges) on a generic curved space. As an application we obtain the superconformal index (SCI) of 4d theories. The large N SCI of quiver gauge theories has been previously noticed to factorize over the set of extremal BPS mesonic operators. In chapter 3, we reformulate this factorization in terms of the zigzag paths in the dimer model associated to the quiver and extend the factorization theorem of the index to include theories obtained from D-branes probing orbifold singularities. In chapter 4, we consider the dualities in two classes of 3 dimensional theories. The first class consist of dualities of certain necklace type Chern-Simons (CS) quiver gauge theories. A non trivial check of these dualities is provided by matching their squashed sphere partition functions. The second class consists of theories whose duals are described by a collection of free fields. In such cases, due to mixing between the superconformal R-symmetry and accidental symmetries, the matching of electric and magnetic partition functions is not straightforward. We provide a prescription to rectify this mismatch. In chapter 5, we consider some the N = 1 4d theories with orthogonal and symplectic gauge groups, arising from N = 1 preserving reduction of 6d theories on a Riemann surface. This construction allows us to dual descriptions of 4d theories. Some of the dual frames have no known Lagrangian description. We check the dualities by computing the anomaly coefficients and the superconformal indices. We also give a prescription to write the index of the theory obtained by reduction of 6d theories on a three
The Politics of Political Correctness.
ERIC Educational Resources Information Center
Minsky, Leonard
1992-01-01
This article reacts to President Bush's entry into the dispute over "political correctness" on college campuses. The paper summarizes discussions of students, faculty, and others in the Washington, D.C. area which concluded that this seeming defense of free speech is actually an attack on affirmative action and multiculturalism stemming from the…
NASA Astrophysics Data System (ADS)
Berzak Hopkins, Laura
2013-03-01
Politics and policy affect all of us, both as scientists and as citizens, and issues ranging from laboratory budgets to arms control treaties clearly require research problem-solving skills and technical expertise. There is a critical role for scientists in each aspect of the political system, and in fact, we as a society need more scientists to take part in politics. Furthermore, the research we pursue has important societal applications and is fascinating! We have a right and a responsibility to share our scientific knowledge not only with each other, but with the general public as well. So, why are we as a community of scientists reticent in the public arena, hesitant to enter politics, and even at times unsupportive of our peers who transition into governmental roles? In this time of fiscal constraint, when difficult research funding (and de-funding) choices are regularly being made, we as scientists must step up to the plate, reach across the aisle, and explain why what we do is fascinating, inspiring, and important, not just to us, but to society as a whole. A range of policy-relevant roles exists inside and outside the laboratory, such as Congressional Fellowships. Each year the Congressional Fellowships program brings together approximately thirty scientists at all stages of their careers to serve as scientific advisors in a variety of offices in the U.S. Senate and House of Representatives. Although the jump from lab to lobbying meetings can be frustrating, the transition can also be intriguing. Firsthand experience with the ``how'' and ``why'' (or lack thereof) of politics and policy is invaluable and provides a unique opportunity to expand and broaden one's background. The opportunity to work on Capitol Hill is unparalleled, particularly because our nation has a definite need for scientists with the inclination and interest to inform and develop policy. But, whatever role you decide to take, from contributing scientific news to local publications to
A duality framework for stochastic optimal control of complex systems
Malikopoulos, Andreas A.
2016-01-01
In this study, we address the problem of minimizing the long-run expected average cost of a complex system consisting of interactive subsystems. We formulate a multiobjective optimization problem of the one-stage expected costs of the subsystems and provide a duality framework to prove that the control policy yielding the Pareto optimal solution minimizes the average cost criterion of the system. We provide the conditions of existence and a geometric interpretation of the solution. For practical situations having constraints consistent with those studied here, our results imply that the Pareto control policy may be of value when we seek to derive online the optimal control policy in complex systems.
Host defense peptides and their antimicrobial-immunomodulatory duality.
Steinstraesser, Lars; Kraneburg, Ursula; Jacobsen, Frank; Al-Benna, Sammy
2011-03-01
Host defence peptides (HDPs) are short cationic molecules produced by the immune systems of most multicellular organisms and play a central role as effector molecules of innate immunity. Host defence peptides have a wide range of biological activities from direct killing of invading pathogens to modulation of immunity and other biological responses of the host. HDPs have important functions in multiple, clinically relevant disease processes and their imbalanced expression is associated with pathology in different organ systems and cell types. Furthermore, HDPs are now evaluated as model molecules for the development of novel natural antibiotics and immunoregulatory compounds. This review provides an overview of HDPs focused on their antimicrobial-immunomodulatory duality.
Disformal coupling, CMB spectral distortion and distance duality relation.
NASA Astrophysics Data System (ADS)
Gubitosi, G.
Light scalar fields can naturally couple disformally to Standard Model fields without giving rise to the unacceptably large fifth forces usually associated with light scalars. We show that these scalar fields can be studied and constrained through their interaction with photons, and focus particularly on changes to the Cosmic Microwave Background spectral distortions and violations of the distance duality relation. We then specialise our constraints to scalars which could play the role of axionic quintessence. The work here presented was done in collaboration with P. Brax, C. Burrage and A. C. Davis.
On uniqueness of T-duality with spectators
NASA Astrophysics Data System (ADS)
Hlavatý, Ladislav; Petrásek, Filip
2016-09-01
We investigate the dependence of non-Abelian T-duality on various identification of the isometry group of target space with its orbits, i.e. with respect to the location of the group unit on manifolds invariant under the isometry group. We show that T-duals constructed by isometry groups of dimension less than the dimension of the (pseudo)-Riemannian manifold may depend not only on the initial metric but also on the choice of manifolds defining positions of group units on each of the submanifold invariant under the isometry group. We investigate whether this dependence can be compensated by coordinate transformation.
Inflation and compactification derived from duality invariant gaugino condensation
Stewart, N.R. )
1992-04-10
Recently it has been demonstrated that the breaking of space-time supersymmetry in the context of string-induced effective actions may be realized in a duality invariant way using gaugino condensates. In this paper, although generically the ground state is a negative minimum, the authors present a toy model of a Hawking-Moss type inflation by invoking a one-loop Casimir effect and adjusting the cosmological constant to zero. This can only be justified a posteriori since the authors obtain inflation and compactification of the target space albeit fine-tuning is necessary.
Quark-Hadron Duality for the Pion: a Phenomenological Study
Wally Melnitchouk
2002-08-01
We explore the relationship between exclusive and inclusive electromagnetic scattering from the pion, focusing on the transition region at intermediate Q{sup 2}. Combining Drell-Yan data on the leading twist quark distribution in the pion with a model for the resonance region at large x, we calculate QCD moments of the pion structure function over a range of Q{sup 2}, and quantify the role of higher twist corrections. Using a parameterization of the pion elastic form factor and phenomenological models for the pi --> p transition form factor, we test the extent to which local duality may be valid for the pion.
The Bloom-Gilman duality and leading logarithms
Carlson, C.E.; Mukhopadhyay, N.C.
1994-04-01
The existing inclusive electroproduction data base allows the authors a look at the issue of the relative behaviors of background and resonance excitations, a part of the Bloom-Gilman duality. These data lack accuracy at high Q{sup 2} but establish PQCD scaling in the resonance region and even allow the authors a glimpse at the leading logarithmic corrections due to the gluon radiation and its possible quenching at large W and x. These should inspire better quality experimental tests at facilities like CEBAF II.
Onset of Quark-Hadron Duality in Pion Electroproduction
Navasardyan, T.; Asaturyan, R.; Mkrtchyan, H.; Tadevosyan, V.; Adams, G. S.; Kubarovski, V.; Moziak, B.; Stoler, P.; Ungaro, M.; Villano, A.; Ahmidouch, A.; Danagoulian, S.; Angelescu, T.; Malace, S.; Arrington, J.; Hafidi, K.; Holt, R. J.; Reimer, P.; Schulte, E.; Zheng, X.
2007-01-12
A large data set of charged-pion ({pi}{sup {+-}}) electroproduction from both hydrogen and deuterium targets has been obtained spanning the low-energy residual-mass region. These data conclusively show the onset of the quark-hadron duality phenomenon, as predicted for high-energy hadron electroproduction. We construct several ratios from these data to exhibit the relation of this phenomenon to the high-energy factorization ansatz of electron-quark scattering and subsequent quark{yields}pion production mechanisms.
Doubled Field Theory, T-Duality and Courant-Brackets
NASA Astrophysics Data System (ADS)
Zwiebach, Barton
In these lecture notes we give a simple introduction into double field theory. We show that the presence of momentum and winding excitations in toroidal backgrounds of closed string theory makes it natural to consider double field theories. A tool-kit is developed based on the Courant-bracket and generalized Lie derivatives. We construct a background independent action which represents a T-duality covariantization of the Einstein-Hilbert action for gravity coupled to an antisymmetric tensor field and a dilaton.
F-Theory, T-Duality on K3 Surfaces and N = 2 Supersymmetric Gauge Theories in Four Dimensions
Hori, K.; Oz, Y.
1997-02-26
We construct T-duality on K3 surfaces. The T-duality exchanges a 4-brane R-R charge and a O-brane R-R charge. We study the action of the T-duality on the moduli space of O-branes located at points of K3 and 4-branes wrapping it. We apply the construction to F-theory compactified on a Calabi-Yau 4-fold and study the duality of N = 2 SU(N{sub c}) gauge theories in four dimensions. We discuss the generalization to the N = 1 duality scenario.
Open/closed string duality and relativistic fluids
NASA Astrophysics Data System (ADS)
Niarchos, Vasilis
2016-07-01
We propose an open/closed string duality in general backgrounds extending previous ideas about open string completeness by Ashoke Sen. Our proposal sets up a general version of holography that works in gravity as a tomographic principle. We argue, in particular, that previous expectations of a supergravity/Dirac-Born-Infeld (DBI) correspondence are naturally embedded in this conjecture and can be tested in a well-defined manner. As an example, we consider the correspondence between open string field theories on extremal D-brane setups in flat space in the large-N , large 't Hooft limit, and asymptotically flat solutions in ten-dimensional type II supergravity. We focus on a convenient long-wavelength regime, where specific effects of higher-spin open string modes can be traced explicitly in the dual supergravity computation. For instance, in this regime we show how the full Abelian DBI action arises from supergravity as a straightforward reformulation of relativistic hydrodynamics. In the example of a (2 +1 )-dimensional open string theory this reformulation involves an Abelian Hodge duality. We also point out how different deformations of the DBI action, related to higher-derivative corrections and non-Abelian effects, can arise in this context as deformations in corresponding relativistic hydrodynamics.
Duality groups, automorphic forms, and higher derivative corrections
Lambert, Neil; West, Peter
2007-03-15
We study the higher derivative corrections that occur in type II superstring theories in ten dimensions or less. Assuming invariance under a discrete duality group G(Z) we show that the generic functions of the scalar fields that occur can be identified with automorphic forms. We then give a systematic method to construct automorphic forms from a given group G(Z) together with a chosen subgroup H and a linear representation of G(Z). This construction is based on the theory of nonlinear realizations and we find that the automorphic forms contain the weights of G. We also carry out the dimensional reduction of the generic higher derivative corrections of the IIB theory to three dimensions and find that the weights of E{sub 8} occur generalizing previous results of the authors on M theory. Since the automorphic forms of this theory contain the weights of E{sub 8} we can interpret the occurrence of weights in the dimensional reduction as evidence for an underlying U-duality symmetry.
The origins of duality of patterning in artificial whistled languages
Verhoef, Tessa
2012-01-01
In human speech, a finite set of basic sounds is combined into a (potentially) unlimited set of well-formed morphemes. Hockett (1960) placed this phenomenon under the term ‘duality of patterning’ and included it as one of the basic design features of human language. Of the thirteen basic design features Hockett proposed, duality of patterning is the least studied and it is still unclear how it evolved in language. Recent work shedding light on this is summarized in this paper and experimental data is presented. This data shows that combinatorial structure can emerge in an artificial whistled language through cultural transmission as an adaptation to human cognitive biases and learning. In this work the method of experimental iterated learning (Kirby et al. 2008) is used, in which a participant is trained on the reproductions of the utterances the previous participant learned. Participants learn and recall a system of sounds that are produced with a slide whistle. Transmission from participant to participant causes the whistle systems to change and become more learnable and more structured. These findings follow from qualitative observations, quantitative measures and a follow-up experiment that tests how well participants can learn the emerged whistled languages by generalizing from a few examples. PMID:23637710
The duality principle in the presence of postselection
NASA Astrophysics Data System (ADS)
Leach, Jonathan; Bolduc, Eliot; Miatto, Filippo M.; Piché, Kevin; Leuchs, Gerd; Boyd, Robert W.
2016-01-01
The duality principle, a cornerstone of quantum mechanics, limits the coexistence of wave and particle behaviours of quantum systems. This limitation takes a quantitative form when applied to the visibility of interference fringes and predictability of paths within a two-alternative system, which are bound by the inequality . However, if such a system is coupled to its environment, it becomes possible to obtain conditional measures of visibility and predictability, i.e. measures that are conditioned on the state of the environment. We show that in this case, the predictability and visibility values can lead to an apparent violation of the duality principle. We experimentally realize this apparent violation in a controlled manner by enforcing a fair-sampling-like loophole via postselection. This work highlights some of the subtleties that one can encounter while interpreting familiar quantities such as which-alternative information and visibility. While we concentrated on an extreme example, it is of utmost importance to realise that such subtleties might also be present in cases where the results are not obviously violating an algebraic bound, making them harder (but not any less crucial) to detect.
Young's double-slit experiment: noise-resolution duality.
Nesterets, Yakov I; Gureyev, Timur E
2015-02-01
Statistical aspects of Young's double-slit diffraction experiment are analysed quantitatively. It is shown that the signal-to-noise ratio and the spatial resolution in the detected diffraction pattern satisfy a duality relationship which implies that both of them cannot be improved simultaneously beyond a certain limit if the total number of particles forming the image is fixed. As a consequence of this duality, it is possible to estimate the minimal number of particles that have to be detected in order for two slits separated by a given distance to be resolved with a confidence level corresponding to a pre-defined signal-to-noise ratio, e.g. according to the Rose criterion. These results are related to the recently introduced imaging system quality characteristic which combines the spatial resolution and the noise sensitivity, and allows one to estimate the efficiency with which imaging quanta are utilised in a system to deliver maximal amount of information about the imaged object. The presented results can be useful for applications where the imaging quanta are at a premium or where minimization of the radiation dose is important.
The duality principle in the presence of postselection
Leach, Jonathan; Bolduc, Eliot; Miatto, Filippo M.; Piché, Kevin; Leuchs, Gerd; Boyd, Robert W.
2016-01-01
The duality principle, a cornerstone of quantum mechanics, limits the coexistence of wave and particle behaviours of quantum systems. This limitation takes a quantitative form when applied to the visibility of interference fringes and predictability of paths within a two-alternative system, which are bound by the inequality . However, if such a system is coupled to its environment, it becomes possible to obtain conditional measures of visibility and predictability, i.e. measures that are conditioned on the state of the environment. We show that in this case, the predictability and visibility values can lead to an apparent violation of the duality principle. We experimentally realize this apparent violation in a controlled manner by enforcing a fair-sampling-like loophole via postselection. This work highlights some of the subtleties that one can encounter while interpreting familiar quantities such as which-alternative information and visibility. While we concentrated on an extreme example, it is of utmost importance to realise that such subtleties might also be present in cases where the results are not obviously violating an algebraic bound, making them harder (but not any less crucial) to detect. PMID:26821619
Bilinear covariants and spinor fields duality in quantum Clifford algebras
Abłamowicz, Rafał; Gonçalves, Icaro; Rocha, Roldão da
2014-10-15
Classification of quantum spinor fields according to quantum bilinear covariants is introduced in a context of quantum Clifford algebras on Minkowski spacetime. Once the bilinear covariants are expressed in terms of algebraic spinor fields, the duality between spinor and quantum spinor fields can be discussed. Thus, by endowing the underlying spacetime with an arbitrary bilinear form with an antisymmetric part in addition to a symmetric spacetime metric, quantum algebraic spinor fields and deformed bilinear covariants can be constructed. They are thus compared to the classical (non quantum) ones. Classes of quantum spinor fields classes are introduced and compared with Lounesto's spinor field classification. A physical interpretation of the deformed parts and the underlying Z-grading is proposed. The existence of an arbitrary bilinear form endowing the spacetime already has been explored in the literature in the context of quantum gravity [S. W. Hawking, “The unpredictability of quantum gravity,” Commun. Math. Phys. 87, 395 (1982)]. Here, it is shown further to play a prominent role in the structure of Dirac, Weyl, and Majorana spinor fields, besides the most general flagpoles and flag-dipoles. We introduce a new duality between the standard and the quantum spinor fields, by showing that when Clifford algebras over vector spaces endowed with an arbitrary bilinear form are taken into account, a mixture among the classes does occur. Consequently, novel features regarding the spinor fields can be derived.
Representation Theory over Tropical Semifield and Langlands Duality
NASA Astrophysics Data System (ADS)
Gerasimov, Anton A.; Lebedev, Dimitri R.
2013-06-01
Recently we propose a class of infinite-dimensional integral representations of classical {{gl}_{ell+1}}-Whittaker functions and local Archimedean local L-factors using two-dimensional topological field theory framework. The local Archimedean Langlands duality was identified in this setting with the mirror symmetry of the underlying topological field theories. In this note we introduce elementary analogs of the Whittaker functions and the Archimedean L-factors given by U ℓ+1-equivariant symplectic volumes of appropriate Kähler U ℓ+1-manifolds. We demonstrate that the functions thus defined have a dual description as matrix elements of representations of monoids {GL_{ell+1}({R}), {R}} being the tropical semifield. We also show that the elementary Whittaker functions can be obtained from the non-Archimedean Whittaker functions over {{Q}_p} by taking the formal limit p→ 1. Hence the elementary special functions constructed in this way might be considered as functions over the mysterious field {{Q}_1}. The existence of two representations for the elementary Whittaker functions, one as an equivariant volume and the other as a matrix element, should be considered as a manifestation of a hypothetical elementary analog of the local Langlands duality for number fields. We would like to note that the elementary local L-factors coincide with L-factors introduced previously by Kurokawa.
ERIC Educational Resources Information Center
Mehlinger, Howard D.; Patrick, John J.
This text presents high school students with up-to-date findings of social scientists about political behavior in order to increase their political knowledge and sophistication. Case studies which describe the various political activities of typical citizens and political leaders are used throughout the work. Simulations, games, political attitude…
NASA Astrophysics Data System (ADS)
Ranson, John
2009-04-01
The sentiments expressed by Sidney Drell in his forum article "The nuclear threat: a new start" (February pp16-17) are laudable, but it was disappointing to find this almost entirely political story in isolation. The article, which outlined the prospects for reducing weapons stockpiles under the new US administration, would have been more pertinent as an introduction to a series describing the technology used in detecting nuclear-testing activity. It would have been interesting to discuss the specific equipment and methods used, together with the analysis and correlation techniques - along with an indication of how sensitive and reliable they are (if the information is not classified). It is far easier to detect an explosive event than it is to detect and quantify weapons stores, which is a key factor for any negotiated solution. Apart from deductions based on actual inspection and satellite surveillance, are there other techniques that can be applied to this issue?
Teaching Youngsters About Politics
ERIC Educational Resources Information Center
Hunkins, Francis P.
1976-01-01
Discusses four possible approaches for teaching political science in the classroom, including analyzing the classroom as a political arena, employing case studies, using simulation games, and orchestrating encounters with political figures. (Author/JG)
Self-duality for the two-component asymmetric simple exclusion process
Belitsky, V.; Schütz, G. M.
2015-08-15
We study a two-component asymmetric simple exclusion process (ASEP) that is equivalent to the ASEP with second-class particles. We prove self-duality with respect to a family of duality functions which are shown to arise from the reversible measures of the process and the symmetry of the generator under the quantum algebra U{sub q}[gl{sub 3}]. We construct all invariant measures in explicit form and discuss some of their properties. We also prove a sum rule for the duality functions.
Evidence for quark-hadron duality in {gamma}*p helicity cross sections
Malace, S. P.; Melnitchouk, W.; Psaker, A.
2011-03-15
Combining data on unpolarized and polarized inclusive proton structure functions, we perform the first detailed study of quark-hadron duality in individual helicity-1/2 and 3/2 virtual photoproduction cross sections. We find that duality is realized more clearly in the helicity-1/2 channel, with duality-violating corrections < or approx. 10% over the entire nucleon resonance region, while larger, < or approx. 20% corrections are found in the helicity-3/2 sector. The results are in general agreement with quark model expectations, and suggest that data above the {Delta} resonance region may be used to constrain both spin-averaged and spin-dependent parton distributions.
NASA Astrophysics Data System (ADS)
Mross, David F.; Alicea, Jason; Motrunich, Olexei I.
2016-07-01
We explicitly derive the duality between a free electronic Dirac cone and quantum electrodynamics in (2 +1 ) dimensions (QED3 ) with N =1 fermion flavors. The duality proceeds via an exact, nonlocal mapping from electrons to dual fermions with long-range interactions encoded by an emergent gauge field. This mapping allows us to construct parent Hamiltonians for exotic topological-insulator surface phases, derive the particle-hole-symmetric field theory of a half-filled Landau level, and nontrivially constrain QED3 scaling dimensions. We similarly establish duality between bosonic topological insulator surfaces and N =2 QED3 .
Ohkubo, Jun
2015-10-01
An alternative application of duality relations of stochastic processes is demonstrated. Although conventional usages of the duality relations need analytical solutions for the dual processes, here I employ numerical solutions of the dual processes and investigate the usefulness. As a demonstration, estimation problems of hidden variables in stochastic differential equations are discussed. Employing algebraic probability theory, a little complicated birth-death process is derived from the stochastic differential equations, and an estimation method based on the ensemble Kalman filter is proposed. As a result, the possibility for making faster computational algorithms based on the duality concepts is shown.
A duality framework for stochastic optimal control of complex systems
Malikopoulos, Andreas A.
2016-01-01
In this study, we address the problem of minimizing the long-run expected average cost of a complex system consisting of interactive subsystems. We formulate a multiobjective optimization problem of the one-stage expected costs of the subsystems and provide a duality framework to prove that the control policy yielding the Pareto optimal solution minimizes the average cost criterion of the system. We provide the conditions of existence and a geometric interpretation of the solution. For practical situations having constraints consistent with those studied here, our results imply that the Pareto control policy may be of value when we seek to derivemore » online the optimal control policy in complex systems.« less
Cones of positive maps and their duality relations
NASA Astrophysics Data System (ADS)
Skowronek, Łukasz; Størmer, Erling; Życzkowski, Karol
2009-06-01
The structure of cones of positive and k-positive maps acting on a finite-dimensional Hilbert space is investigated. Special emphasis is given to their duality relations to the sets of superpositive and k-superpositive maps. We characterize k-positive and k-superpositive maps with regard to their properties under taking compositions. A number of results obtained for maps are also rephrased for the corresponding cones of block positive, k-block positive, separable, and k-entangled operators due to the Jamiołkowski-Choi isomorphism. Generalizations to a situation where no such simple isomorphism is available are also made, employing the idea of mapping cones. As a side result to our discussion, we show that extreme entanglement witnesses, which are optimal, should be of special interest in entanglement studies.
T-duality via gerby geometry and reductions
NASA Astrophysics Data System (ADS)
Bunke, Ulrich; Nikolaus, Thomas
2015-06-01
We consider topological T-duality of torus bundles equipped with {S}1-gerbes. We show how a geometry on the gerbe determines a reduction of its band to the subsheaf of S1-valued functions which are constant along the torus fibers. We observe that such a reduction is exactly the additional datum needed for the construction of a T-dual pair. We illustrate the theory by working out the example of the canonical lifting gerbe on a compact Lie group which is a torus bundle over the associated flag manifold. It was a recent observation of Daenzer and van Erp [16] that for certain compact Lie groups and a particular choice of the gerbe, the T-dual torus bundle is given by the Langlands dual group.
Inference in infinite-dimensional inverse problems - Discretization and duality
NASA Technical Reports Server (NTRS)
Stark, Philip B.
1992-01-01
Many techniques for solving inverse problems involve approximating the unknown model, a function, by a finite-dimensional 'discretization' or parametric representation. The uncertainty in the computed solution is sometimes taken to be the uncertainty within the parametrization; this can result in unwarranted confidence. The theory of conjugate duality can overcome the limitations of discretization within the 'strict bounds' formalism, a technique for constructing confidence intervals for functionals of the unknown model incorporating certain types of prior information. The usual computational approach to strict bounds approximates the 'primal' problem in a way that the resulting confidence intervals are at most long enough to have the nominal coverage probability. There is another approach based on 'dual' optimization problems that gives confidence intervals with at least the nominal coverage probability. The pair of intervals derived by the two approaches bracket a correct confidence interval. The theory is illustrated with gravimetric, seismic, geomagnetic, and helioseismic problems and a numerical example in seismology.
K3-fibrations and heterotic-type II string duality
NASA Astrophysics Data System (ADS)
Klemm, A.; Lerche, W.; Mayr, P.
1995-02-01
We analyze the map between heterotic and type II N = 2 supersymmetric string theories for certain two and three moduli examples found by Kachru and Vafa. The appearance of elliptic j-functions can be traced back to specializations of the Picard-Fuchs equations to systems for K3 surfaces. For the three-moduli example we write the mirror maps and Yukawa couplings in the weak coupling limit in terms of j-functions; the expressions agree with those obtained in perturbative calculations in the heterotic string in an impressive way. We also discuss symmetries of the world-sheet instanton numbers in the type II theory, and interpret them in terms of S-duality of the non-perturbative heterotic string.
Eisenstein series for infinite-dimensional U-duality groups
NASA Astrophysics Data System (ADS)
Fleig, Philipp; Kleinschmidt, Axel
2012-06-01
We consider Eisenstein series appearing as coefficients of curvature corrections in the low-energy expansion of type II string theory four-graviton scattering amplitudes. We define these Eisenstein series over all groups in the E n series of string duality groups, and in particular for the infinite-dimensional Kac-Moody groups E 9, E 10 and E 11. We show that, remarkably, the so-called constant term of Kac-Moody-Eisenstein series contains only a finite number of terms for particular choices of a parameter appearing in the definition of the series. This resonates with the idea that the constant term of the Eisenstein series encodes perturbative string corrections in BPS-protected sectors allowing only a finite number of corrections. We underpin our findings with an extensive discussion of physical degeneration limits in D < 3 space-time dimensions.
Correlation Inequalities for Interacting Particle Systems with Duality
NASA Astrophysics Data System (ADS)
Giardinà, C.; Redig, F.; Vafayi, K.
2010-10-01
We prove a comparison inequality between a system of independent random walkers and a system of random walkers which either interact by attracting each other—a process which we call here the symmetric inclusion process (SIP)—or repel each other—a generalized version of the well-known symmetric exclusion process. As an application, new correlation inequalities are obtained for the SIP, as well as for some interacting diffusions which are used as models of heat conduction,—the so-called Brownian momentum process, and the Brownian energy process. These inequalities are counterparts of the inequalities (in the opposite direction) for the symmetric exclusion process, showing that the SIP is a natural bosonic analogue of the symmetric exclusion process, which is fermionic. Finally, we consider a boundary driven version of the SIP for which we prove duality and then obtain correlation inequalities.
S-duality in AdS/CFT magnetohydrodynamics
NASA Astrophysics Data System (ADS)
Hansen, James; Kraus, Per
2009-10-01
We study the nonlinear hydrodynamics of a 2+1 dimensional charged conformal fluid subject to slowly varying external electric and magnetic fields. Following recent work on deriving nonlinear hydrodynamics from gravity, we demonstrate how long wavelength perturbations of the AdS dyonic black brane solution of 4D supergravity are governed by equations equivalent to fluid dynamics equations in the boundary theory. We investigate the implications of S-duality for our system, and derive restrictions imposed on the transport coefficients of a generic fluid invariant under the S operation. We also expand on our earlier work and determine a new set of previously undetermined transport coefficients for the conformal fluid with an AdS gravity dual. Quite surprisingly, we discover that half of the transport coefficients allowed by symmetry vanish in the holographic fluid at linear order in the hydrodynamic expansion.
Duality in spin systems via the SU(4) algebra
NASA Astrophysics Data System (ADS)
Schaller, Gernot; Schützhold, Ralf
2016-05-01
We provide several examples and an intuitive diagrammatic representation demonstrating the use of two-qubit unitary transformations for mapping coupled spin Hamiltonians to simpler ones and vice versa. The corresponding dualities may be exploited to identify phase transition points or to aid the diagonalization of such Hamiltonians. For example, our method shows that a suitable one-parameter family of coupled Hamiltonians whose ground states transform from an initially factorizing state to a final cluster state on a lattice of arbitrary dimension is dual to a family of trivial decoupled Hamiltonians containing local on-site terms only. As a consequence, the minimum energy gap (which determines the adiabatic run-time) does not scale with system size, which facilitates an efficient and simple adiabatic preparation of e.g. the two-dimensional cluster state used for measurement-based quantum computation.
Entropic framework for wave-particle duality in multipath interferometers
NASA Astrophysics Data System (ADS)
Coles, Patrick J.
2016-06-01
An interferometer—no matter how clever the design—cannot reveal both the wave and the particle behavior of a quantum system. This fundamental idea has been captured by inequalities, so-called wave-particle duality relations (WPDRs), that upper bound the sum of the fringe visibility (wave behavior) and path distinguishability (particle behavior). Another fundamental idea is Heisenberg's uncertainty principle, stating that some pairs of observables cannot be known simultaneously. Recent work has unified these two principles for two-path interferometers. Here we extend this unification to n -path interferometers, showing that WPDRs correspond to a modern formulation of the uncertainty principle stated in terms of entropies. Furthermore, our unification provides a framework for solving an outstanding problem of how to formulate universally valid WPDRs for interferometers with more than two paths, and we employ this framework to derive some novel WPDRs.
Lectures on Cohomology, T-Duality, and Generalized Geometry
NASA Astrophysics Data System (ADS)
Bouwknegt, P.
These are notes for lectures, originally entitled "Selected Mathematical Aspects of Modern Quantum Field Theory", presented at the Summer School "New Paths Towards Quantum Gravity", Holbæ k, Denmark, 10-16 May 2008. My aim for these lectures was to introduce a mixture of physics and mathematics postgraduate students into a selection of exciting new developments on the interface of mathematics and quantum field theory. This write-up covers three topics: (1) cohomology and differential characters, (2) T-duality, and (3) generalized geometry. The three chapters can be read, more or less, independent of each other, but there is a common central theme, namely the occurrence of a (local) 2-form gauge field in certain quantum fields theories, the so-called B-field, which plays a role analogous to the electromagnetic gauge field.
Equivalence of wave-particle duality to entropic uncertainty.
Coles, Patrick J; Kaniewski, Jedrzej; Wehner, Stephanie
2014-01-01
Interferometers capture a basic mystery of quantum mechanics: a single particle can exhibit wave behaviour, yet that wave behaviour disappears when one tries to determine the particle's path inside the interferometer. This idea has been formulated quantitatively as an inequality, for example, by Englert and Jaeger, Shimony and Vaidman, which upper bounds the sum of the interference visibility and the path distinguishability. Such wave-particle duality relations (WPDRs) are often thought to be conceptually inequivalent to Heisenberg's uncertainty principle, although this has been debated. Here we show that WPDRs correspond precisely to a modern formulation of the uncertainty principle in terms of entropies, namely, the min- and max-entropies. This observation unifies two fundamental concepts in quantum mechanics. Furthermore, it leads to a robust framework for deriving novel WPDRs by applying entropic uncertainty relations to interferometric models. As an illustration, we derive a novel relation that captures the coherence in a quantum beam splitter. PMID:25524138
Nonextensive thermodynamic relations based on the assumption of temperature duality
NASA Astrophysics Data System (ADS)
Zheng, Yahui; Du, Jiulin
2016-11-01
The nonextensive thermodynamic relations are expressed under the assumption of temperature duality, endowing the "physical temperature" and the "Lagrange temperature" in different physical senses. Based on this assumption, two sets of parallel Legendre transform structures are given. One is called "physical" set, and the other is called "Lagrange" set. In these two formalisms, the thermodynamic quantities and the thermodynamic relations are both liked through the Tsallis factor. Application of the two sets of the thermodynamic relations to the self-gravitating system shows that the heat capacity defined in the classical thermodynamics has no relevance to the stability of the system. Instead, the newly defined heat capacity can determine the stability of the system.
Penguins with charm and quark-hadron duality
NASA Astrophysics Data System (ADS)
Beneke, M.; Buchalla, G.; Neubert, M.; Sachrajda, C. T.
2009-06-01
The integrated branching fraction of the process B→ X s l + l - is dominated by resonance background from narrow charmonium states, such as B→ X s ψ→ X s l + l -, which exceeds the non-resonant charm-loop contribution by two orders of magnitude. The origin of this fact is discussed in view of the general expectation of quark-hadron duality. The situation in B→ X s l + l - is contrasted with charm-penguin amplitudes in two-body hadronic B decays of the type B→ π π, for which it is demonstrated that resonance effects and the potentially non-perturbative cbar{c} threshold region do not invalidate the standard picture of QCD factorization. This holds irrespective of whether the charm quark is treated as a light or a heavy quark.
Novel duality in disorder driven local quantum criticality.
Tran, Minh-Tien; Kim, Ki-Seok
2010-09-10
We find that competition between random Kondo and random magnetic correlations results in a quantum phase transition from a local Fermi liquid to a spin liquid. The local charge susceptibility turns out to have exactly the same critical exponent as the local spin susceptibility, suggesting a novel duality between the Kondo singlet phase and the critical local moment state beyond the Landau-Ginzburg-Wilson symmetry breaking framework. This leads us to propose an enhanced symmetry at the local quantum critical point, described by an O(4) vector for spin and charge. The symmetry enhancement serves as a mechanism of electron fractionalization in critical impurity dynamics, where such fractionalized excitations are identified with topological excitations.
Electrodynamic duality and vortex unbinding in driven-dissipative condensates
NASA Astrophysics Data System (ADS)
Wachtel, G.; Sieberer, L. M.; Diehl, S.; Altman, E.
2016-09-01
We investigate the superfluid properties of two-dimensional driven Bose liquids, such as polariton condensates, using their long-wavelength description in terms of a compact Kardar-Parisi-Zhang (KPZ) equation for the phase dynamics. We account for topological defects (vortices) in the phase field through a duality mapping between the compact KPZ equation and a theory of nonlinear electrodynamics coupled to charges. Using the dual theory, we derive renormalization group equations that describe vortex unbinding in these media. When the nonequilibirum drive is turned off, the KPZ nonlinearity λ vanishes and the RG flow gives the usual Kosterlitz-Thouless (KT) transition. On the other hand, with nonlinearity λ >0 vortices always unbind, even if the same system with λ =0 is superfluid. We predict the finite-size scaling behavior of the superfluid stiffness in the crossover governed by vortex unbinding showing its clear distinction from the scaling associated with the KT transition.
Coherence-path duality relations for N paths
NASA Astrophysics Data System (ADS)
Hillery, Mark; Bagan, Emilio; Bergou, Janos; Cottrell, Seth
2016-05-01
For an interferometer with two paths, there is a relation between the information about which path the particle took and the visibility of the interference pattern at the output. The more path information we have, the smaller the visibility, and vice versa. We generalize this relation to a multi-path interferometer, and we substitute two recently defined measures of quantum coherence for the visibility, which results in two duality relations. The path information is provided by attaching a detector to each path. In the first relation, which uses an l1 measure of coherence, the path information is obtained by applying the minimum-error state discrimination procedure to the detector states. In the second, which employs an entropic measure of coherence, the path information is the mutual information between the detector states and the result of measuring them. Both approaches are quantitative versions of complementarity for N-path interferometers. Support provided by the John Templeton Foundation.
Precision Test of Gauge-Gravity Duality with Flavor
NASA Astrophysics Data System (ADS)
Karch, Andreas; Robinson, Brandon; Uhlemann, Christoph F.
2015-12-01
We put AdS/CFT dualities involving probe branes to a precision test. On the holographic side we use a new class of supersymmetric D 7 -brane embeddings into AdS5×S5 , which allow us to describe N =4 super Yang-Mills theory coupled to massive N =2 supersymmetric flavors on S4 . With these embeddings we can compare holographic results to a field theory analysis of the free energy using supersymmetric localization. Localization allows us to get results at strong coupling, and hence to compare in detail to AdS/CFT. We find analytically matching results: a phase transition at the same critical mass in both calculations and matching free energies up to a scheme-dependent constant in both phases.
Duality invariance in Fayet-Iliopoulos gauged supergravity
NASA Astrophysics Data System (ADS)
Cacciatori, Sergio L.; Klemm, Dietmar; Rabbiosi, Marco
2016-09-01
We propose a geometric method to study the residual symmetries in N = 2, d = 4 U(1) Fayet-Iliopoulos (FI) gauged supergravity. It essentially involves the stabilization of the symplectic vector of gauge couplings (FI parameters) under the action of the U-duality symmetry of the ungauged theory. In particular we are interested in those transformations that act non-trivially on the solutions and produce scalar hair and dyonic black holes from a given seed. We illustrate the procedure for finding this group in general and then show how it works in some specific models. For the prepotential F = - iX 0 X 1, we use our method to add one more parameter to the rotating Chow-Compère solution, representing scalar hair.
Equivalence of wave-particle duality to entropic uncertainty.
Coles, Patrick J; Kaniewski, Jedrzej; Wehner, Stephanie
2014-12-19
Interferometers capture a basic mystery of quantum mechanics: a single particle can exhibit wave behaviour, yet that wave behaviour disappears when one tries to determine the particle's path inside the interferometer. This idea has been formulated quantitatively as an inequality, for example, by Englert and Jaeger, Shimony and Vaidman, which upper bounds the sum of the interference visibility and the path distinguishability. Such wave-particle duality relations (WPDRs) are often thought to be conceptually inequivalent to Heisenberg's uncertainty principle, although this has been debated. Here we show that WPDRs correspond precisely to a modern formulation of the uncertainty principle in terms of entropies, namely, the min- and max-entropies. This observation unifies two fundamental concepts in quantum mechanics. Furthermore, it leads to a robust framework for deriving novel WPDRs by applying entropic uncertainty relations to interferometric models. As an illustration, we derive a novel relation that captures the coherence in a quantum beam splitter.
Deeply virtual Compton scattering from gauge/gravity duality
Costa, Miguel S.; Djuric, Marko
2013-04-15
We use gauge/gravity duality to study deeply virtual Compton scattering (DVCS) in the limit of high center of mass energy at fixed momentum transfer, corresponding to the limit of low Bjorken x, where the process is dominated by the exchange of the pomeron. At strong coupling, the pomeron is described as the graviton Regge trajectory in AdS space, with a hard wall to mimic confinement effects. This model agrees with HERA data in a large kinematical range. The behavior of the DVCS cross section for very high energies, inside saturation, can be explained by a simple AdS black disk model. In a restricted kinematical window, this model agrees with HERA data as well.
Arbitrary dimensional Majorana dualities and architectures for topological matter
NASA Astrophysics Data System (ADS)
Nussinov, Zohar; Ortiz, Gerardo; Cobanera, Emilio
2012-08-01
Motivated by the prospect of attaining Majorana modes at the ends of nanowires, we analyze interacting Majorana systems on general networks and lattices in an arbitrary number of dimensions, and derive universal spin duals. We prove that these interacting Majorana systems, quantum Ising gauge theories, and transverse-field Ising models with annealed bimodal disorder are all dual to one another on general planar graphs. This leads to an interesting connection between heavily disordered annealed Ising systems and uniform Ising theories with nearest-neighbor interactions. As any Dirac fermion (including electronic) operator can be expressed as a linear combination of two Majorana fermion operators, our results further lead to dualities between interacting Dirac fermionic systems on rather general lattices and graphs and corresponding spin systems. Such general complex Majorana architectures (other than those of simple square or other crystalline arrangements) might be of empirical relevance. As these systems display low-dimensional symmetries, they are candidates for realizing topological quantum order. The spin duals allow us to predict the feasibility of various standard transitions as well as spin-glass-type behavior in interacting Majorana fermion or electronic systems. Several systems that can be simulated by arrays of Majorana wires are further introduced and investigated: (1) the XXZ honeycomb compass model (intermediate between the classical Ising model on the honeycomb lattice and Kitaev's honeycomb model), (2) a checkerboard lattice realization of the model of Xu and Moore for superconducting (p+ip) arrays, and a (3) compass-type two-flavor Hubbard model with both pairing and hopping terms. By the use of our dualities (tantamount to high-dimensional fermionization), we show that all of these systems lie in the three-dimensional Ising universality class. We further discuss how the existence of topological orders and bounds on autocorrelation times can be
Approaches to emergent spacetime in gauge/gravity duality
NASA Astrophysics Data System (ADS)
Sully, James Kenneth
2013-08-01
In this thesis we explore approaches to emergent local spacetime in gauge/gravity duality. We first conjecture that every CFT with a large-N type limit and a parametrically large gap in the spectrum of single-trace operators has a local bulk dual. We defend this conjecture by counting consistent solutions to the four-point function in simple scalar models and matching to the number of local interaction terms in the bulk. Next, we proceed to explicitly construct local bulk operators using smearing functions. We argue that this construction allows one to probe inside black hole horizons for only short times. We then suggest that the failure to construct bulk operators inside a black hole at late times is indicative of a break-down of local effective field theory at the black hole horizon. We argue that the postulates of black hole complementarity are inconsistent and cannot be realized within gauge/gravity duality. We argue that the most conservative solution is a firewall at the black hole horizon and we critically explore alternative resolutions. We then examine the CGHS model of two-dimensional gravity to look for dynamical formation of firewalls. We find that the CGHS model does not exhibit firewalls, but rather contains long-lived remnants. We argue that, while this is consistent for the CGHS model, it cannot be so in higher-dimensional theories of gravity. Lastly, we turn to F-theory, and detail local and global obstructions to writing elliptic fibrations in Tate form. We determine more general possible forms.
String duality transformations in f(R) gravity from Noether symmetry approach
Capozziello, Salvatore; Gionti, Gabriele S.J.; Vernieri, Daniele E-mail: ggionti@as.arizona.edu
2016-01-01
We select f(R) gravity models that undergo scale factor duality transformations. As a starting point, we consider the tree-level effective gravitational action of bosonic String Theory coupled with the dilaton field. This theory inherits the Busher's duality of its parent String Theory. Using conformal transformations of the metric tensor, it is possible to map the tree-level dilaton-graviton string effective action into f(R) gravity, relating the dilaton field to the Ricci scalar curvature. Furthermore, the duality can be framed under the standard of Noether symmetries and exact cosmological solutions are derived. Using suitable changes of variables, the string-based f(R) Lagrangians are shown in cases where the duality transformation becomes a parity inversion.
Comment on {open_quotes}Covariant duality symmetric actions{close_quotes}
Pasti, P.; Sorokin, D.; Tonin, M.
1997-08-01
We demonstrate that an action proposed by Khoudeir and Pantoja [Phys. Rev. D {bold 53}, 5974 (1996)] for endowing Maxwell theory with manifest electric-magnetic duality symmetry contains, in addition to the Maxwell field, additional propagating vector degrees of freedom. Hence it cannot be considered as a duality symmetric action for a {ital single} Abelian gauge field. {copyright} {ital 1997} {ital The American Physical Society}
Quark-hadron duality and truncated moments of nucleon structure functions
Psaker, A.; Melnitchouk, W.; Christy, M. E.; Keppel, C.
2008-08-15
We employ a novel new approach to study local quark-hadron duality using 'truncated' moments, or integrals of structure functions over restricted regions of x, to determine the degree to which individual resonance regions are dominated by leading twist. Because truncated moments obey the same Q{sup 2} evolution equations as the leading twist parton distributions, this approach makes possible for the first time a description of resonance region data and the phenomenon of quark-hadron duality directly from QCD.
Challenges in assessing college students' conception of duality: the case of infinity
NASA Astrophysics Data System (ADS)
Babarinsa-Ochiedike, Grace Olutayo
Interpreting students' views of infinity posits a challenge for researchers due to the dynamic nature of the conception. There is diversity and variation among students' process-object perceptions. The fluctuations between students' views however reveal an undeveloped duality conception. This study examined college students' conception of duality in understanding and representing infinity with the intent to design strategies that could guide researchers in categorizing students' views of infinity into different levels. Data for the study were collected from N=238 college students enrolled in Calculus sequence courses (Pre-Calculus, Calculus I through Calculus III) at one of the southwestern universities in the U.S. using self-report questionnaires and semi-structured individual task-based interviews. Data was triangulated using multiple measures analyzed by three independent experts using self-designed coding sheets to assess students' externalization of the duality conception of infinity. Results of this study reveal that college students' experiences in traditional Calculus sequence courses are not supportive of the development of duality conception. On the contrary, it strengthens the singularity perspective on fundamental ideas of mathematics such as infinity. The study also found that coding and assessing college students' conception of duality is a challenging and complex process due to the dynamic nature of the conception that is task-dependent and context-dependent. Practical significance of the study is that it helps to recognize misconceptions and starts addressing them so students will have a more comprehensive view of fundamental mathematical ideas as they progress through the Calculus coursework sequence. The developed duality concept development framework called Action-Process-Object-Duality (APOD) adapted from the APOS theory could guide educators and researchers as they engage in assessing students' conception of duality. The results of this study
Duality relation and joint measurement in a Mach-Zehnder interferometer
Liu Naile; Li Li; Chen Zengbing; Yu Sixia
2009-05-15
The Mach-Zehnder interferometric setup quantitatively characterizing the wave-particle duality implements in fact a joint measurement of two unsharp observables. We present a necessary and sufficient condition for such a pair of unsharp observables to be jointly measurable. The condition is shown to be equivalent to a duality inequality, which for the optimal strategy of extracting the which-path information is more stringent than the Jaeger-Shimony-Vaidman-Englert inequality.
ERIC Educational Resources Information Center
Chimombo, Moira
1999-01-01
Surveys the interrelationship between language and politics. Touches on the context of political discourse, or political culture and ideology in new and old democracies and the reemerging manifestations of totalitarianism, censorship, and linguistic imperialism; then examines selected linguistic features of political discourse and their…
Talking Politics, Practicing Citizenship
ERIC Educational Resources Information Center
MacKinnon, Mary Pat
2008-01-01
The message emerging from a recent research series on youth civic and political participation is clear: today's youth are not disengaged from associational and small "p" political life, but they are increasingly disenchanted with formal political institutions and practices. Generation Y (those born after 1979) has less formal political knowledge…
SL(2,R) duality-symmetric action for electromagnetic theory with electric and magnetic sources
Lee, Choonkyu; Min, Hyunsoo
2013-12-15
For the SL(2,R) duality-invariant generalization of Maxwell electrodynamics in the presence of both electric and magnetic sources, we formulate a local, manifestly duality-symmetric, Zwanziger-type action by introducing a pair of four-potentials A{sup μ} and B{sup μ} in a judicious way. On the two potentials A{sup μ} and B{sup μ} the SL(2,R) duality transformation acts in a simple linear manner. In quantum theory including charged source fields, this action can be recast as a SL(2,Z)-invariant action. Also given is a Zwanziger-type action for SL(2,R) duality-invariant Born–Infeld electrodynamics which can be important for D-brane dynamics in string theory. -- Highlights: •We formulate a local, manifestly duality-symmetric, Zwanziger-type action. •Maxwell electrodynamics is generalized to include dilaton and axion fields. •SL(2,R) symmetry is manifest. •We formulate a local, manifestly duality-symmetric, nonlinear Born–Infeld action with SL(2,R) symmetry.
Adolescent Political Education and Political Participation.
ERIC Educational Resources Information Center
Lewellen, James R.
This research report studies the impact of informal extracurricular activities and formal social studies curriculum on the political socialization process of high school students. The hypothesis is that involvement in extracurricular activities, school partisan political activities, and exposure to formal course work in social studies is…
Duality picture of Superconductor-insulator transitions on Superconducting nanowire.
Makise, Kazumasa; Terai, Hirotaka; Tominari, Yukihiro; Tanaka, Shukichi; Shinozaki, Bunju
2016-01-01
In this study, we investigated the electrical transport properties of niobium titanium nitride (NbTiN) nanowire with four-terminal geometries to clarify the superconducting phase slip phenomena and superconducting-insulator transitions (SIT) for one-dimensional superconductors. We fabricated various nanowires with different widths and lengths from epitaxial NbTiN films using the electron beam lithography method. The temperature dependence of resistance R(T) below the superconducting transition temperature Tc was analyzed using thermal activation phase slip (TAPS) and quantum phase slip (QPS) theories. Although the accuracy of experimental data at low temperatures can deviate when using the TAPS model, the QPS model thoroughly represents the R(T) characteristic with resistive tail at low temperatures. From the analyses of data on Tc, we found that NbTiN nanowires exhibit SIT because of the change in the ratio of kinetic inductance energy and QPS amplitude energy with respect to the flux-charge duality theory.
Perspectives on Bulk Locality in Gauge/Gravity Duality
NASA Astrophysics Data System (ADS)
Heemskerk, Idse J.
2012-05-01
In this thesis we consider the question of how local bulk physics emerges from the perspective of the boundary field theory in the supergravity limit of gauge/gravity duality. We take three different approaches to this problem, which in retrospect correspond to the different ways of thinking about quantum field theory in the bulk. In the S-matrix approach, we study crossing constraints on two-to-two scattering amplitudes, and provide evidence for the conjecture that a large N expansion and a hierarchy in the spectrum of operator dimension are sufficient conditions for a conformal theory to have a local bulk dual. In the path integral approach we attempt to connect the holographic and Wilsonian renormalization groups. An important role for multi-trace operators is discovered. Although locality remains unexplained, several parallels between holographic and Wilsonian renormalization are made and a physical picture of how the bulk dynamics might emerge from the perspective of the renormalization group is sketched. In the last part we consider the construction of the bulk field operators in terms of smeared boundary operators. Aside from extending the previous work on this construction in several directions, we formulate conditions for obtaining the field operators without already knowing the bulk dynamics and address some paradoxes related to a cat inside a black hole.
Constraints on cosmic distance duality relation from cosmological observations
NASA Astrophysics Data System (ADS)
Lv, Meng-Zhen; Xia, Jun-Qing
2016-09-01
In this paper, we use the model dependent method to revisit the constraint on the well-known cosmic distance duality relation (CDDR). By using the latest SNIa samples, such as Union2.1, JLA and SNLS, we find that the SNIa data alone cannot constrain the cosmic opacity parameter ε, which denotes the deviation from the CDDR, dL =dA(1 + z) 2 + ε, very well. The constraining power on ε from the luminosity distance indicator provided by SNIa and GRB is hardly to be improved at present. When we include other cosmological observations, such as the measurements of Hubble parameter, the baryon acoustic oscillations and the distance information from cosmic microwave background, we obtain the tightest constraint on the cosmic opacity parameter ε, namely the 68% C.L. limit: ε = 0.023 ± 0.018. Furthermore, we also consider the evolution of ε as a function of z using two methods, the parametrization and the principle component analysis, and do not find the evidence for the deviation from zero. Finally, we simulate the future SNIa and Hubble measurements and find the mock data could give very tight constraint on the cosmic opacity ε and verify the CDDR at high significance.
Fuzzy bags, Polyakov loop and gauge/string duality
NASA Astrophysics Data System (ADS)
Zuo, Fen
2014-11-01
Confinement in SU(N) gauge theory is due to the linear potential between colored objects. At short distances, the linear contribution could be considered as the quadratic correction to the leading Coulomb term. Recent lattice data show that such quadratic corrections also appear in the deconfined phase, in both the thermal quantities and the Polyakov loop. These contributions are studied systematically employing the gauge/string duality. "Confinement" in N = 4 SU(N) Super Yang-Mills (SYM) theory could be achieved kinematically when the theory is defined on a compact space manifold. In the large-N limit, deconfinement of N = 4 SYM on {{Bbb S}^3} at strong coupling is dual to the Hawking-Page phase transition in the global Anti-de Sitter spacetime. Meantime, all the thermal quantities and the Polyakov loop achieve significant quadratic contributions. Similar results can also be obtained at weak coupling. However, when confinement is induced dynamically through the local dilaton field in the gravity-dilaton system, these contributions can not be generated consistently. This is in accordance with the fact that there is no dimension-2 gauge-invariant operator in the boundary gauge theory. Based on these results, we suspect that quadratic corrections, and also confinement, should be due to global or non-local effects in the bulk spacetime.
Duality picture of Superconductor-insulator transitions on Superconducting nanowire
Makise, Kazumasa; Terai, Hirotaka; Tominari, Yukihiro; Tanaka, Shukichi; Shinozaki, Bunju
2016-01-01
In this study, we investigated the electrical transport properties of niobium titanium nitride (NbTiN) nanowire with four-terminal geometries to clarify the superconducting phase slip phenomena and superconducting-insulator transitions (SIT) for one-dimensional superconductors. We fabricated various nanowires with different widths and lengths from epitaxial NbTiN films using the electron beam lithography method. The temperature dependence of resistance R(T) below the superconducting transition temperature Tc was analyzed using thermal activation phase slip (TAPS) and quantum phase slip (QPS) theories. Although the accuracy of experimental data at low temperatures can deviate when using the TAPS model, the QPS model thoroughly represents the R(T) characteristic with resistive tail at low temperatures. From the analyses of data on Tc, we found that NbTiN nanowires exhibit SIT because of the change in the ratio of kinetic inductance energy and QPS amplitude energy with respect to the flux-charge duality theory. PMID:27311595
Census taking in the hat: FRW/CFT duality
Sekino, Yasuhiro; Susskind, Leonard
2009-10-15
In this paper a holographic description of eternal inflation is developed. We focus on the description of an open Friedmann-Robertson-Walker (FRW) universe that results from a tunneling event in which a false vacuum with positive vacuum energy decays to a supersymmetric vacuum with vanishing cosmological constant. The observations of a 'census taker' in the final vacuum can be organized into a holographic dual conformal field theory that lives on the asymptotic boundary of space. We refer to this bulk-boundary correspondence as FRW/CFT duality. The dual conformal field theory (CFT) is a Euclidean two-dimensional theory that includes a Liouville 2D gravity sector describing geometric fluctuations of the boundary. The renormalization-group flow of the theory is richer than in the AdS/CFT correspondence, and generates two space-time dimensions--one spacelike and one timelike. We discuss a number of phenomena such as bubble collisions, and the Garriga, Guth Vilenkin 'persistence of memory', from the dual viewpoint.
Bosonized noncommutative bi-fundamental fermion and S-duality
NASA Astrophysics Data System (ADS)
Blas, Harold
2005-06-01
We perform the path-integral bosonization of the recently proposed noncommutative massive Thirring model (NCMT1) [JHEP 0503 (2005) 037]. This model presents two types of current-current interaction terms related to the bi-fundamental representation of the group U(1). Firstly, we address the bosonization of a bi-fundamental free Dirac fermion defined on a noncommutative (NC) euclidean plane Bbb Rθ2. In this case we show that the fermion system is dual to two copies of the NC Wess-Zumino-Novikov-Witten model. Next, we apply the bosonization prescription to the NCMT1 model living on Bbb Rθ2 and show that this model is equivalent to two-copies of the WZNW model and a two-field potential defined for scalar fields corresponding to the global U(1) × U(1) symmetry plus additional bosonized terms for the four fermion interactions. The bosonic sector resembles to the one proposed by Lechtenfeld et al. [Nucl. Phys. B 705 (2005) 477] as the noncommutative sine-Gordon for a pair of scalar fields. The bosonic and fermionic couplings are related by a strong-weak duality. We show that the couplings of the both sectors for some representations satisfy similar relationships up to relevant re-scalings, thus the NC bi-fundamental couplings are two times the corresponding ones of the NC fundamental (anti-fundamental) and eight times the couplings of the ordinary massive Thirring and sine-Gordon models.
Duality Between Spin Networks and the 2D Ising Model
NASA Astrophysics Data System (ADS)
Bonzom, Valentin; Costantino, Francesco; Livine, Etera R.
2016-06-01
The goal of this paper is to exhibit a deep relation between the partition function of the Ising model on a planar trivalent graph and the generating series of the spin network evaluations on the same graph. We provide respectively a fermionic and a bosonic Gaussian integral formulation for each of these functions and we show that they are the inverse of each other (up to some explicit constants) by exhibiting a supersymmetry relating the two formulations. We investigate three aspects and applications of this duality. First, we propose higher order supersymmetric theories that couple the geometry of the spin networks to the Ising model and for which supersymmetric localization still holds. Secondly, after interpreting the generating function of spin network evaluations as the projection of a coherent state of loop quantum gravity onto the flat connection state, we find the probability distribution induced by that coherent state on the edge spins and study its stationary phase approximation. It is found that the stationary points correspond to the critical values of the couplings of the 2D Ising model, at least for isoradial graphs. Third, we analyze the mapping of the correlations of the Ising model to spin network observables, and describe the phase transition on those observables on the hexagonal lattice. This opens the door to many new possibilities, especially for the study of the coarse-graining and continuum limit of spin networks in the context of quantum gravity.
Freezing transition in decaying Burgers turbulence and random matrix dualities
NASA Astrophysics Data System (ADS)
Fyodorov, Y. V.; Le Doussal, P.; Rosso, A.
2010-06-01
We reveal a phase transition with decreasing viscosity ν at ν=νc>0 in one-dimensional decaying Burgers turbulence with a power-law-correlated random profile of Gaussian-distributed initial velocities \\overline{v(x,0)v(x',0)}\\sim\\vert x-x'\\vert ^{-2} . The low-viscosity phase exhibits non-Gaussian one-point probability density of velocities, continuously dependent on ν, reflecting a spontaneous one-step replica symmetry breaking (RSB) in the associated statistical-mechanics problem. We obtain the low orders cumulants analytically. Our results, which are checked numerically, are based on combining insights in the mechanism of the freezing transition in random logarithmic potentials with an extension of duality relations discovered recently in the random matrix theory. They are essentially non-mean-field in nature as also demonstrated by the shock size distribution computed numerically and different from the short-range-correlated Kida model. We also provide some insights for the finite-viscosity behaviour of velocities in the latter model.
Duality, phase structures, and dilemmas in symmetric quantum games
Ichikawa, Tsubasa . E-mail: tsubasa@post.kek.jp; Tsutsui, Izumi
2007-03-15
Symmetric quantum games for 2-player, 2-qubit strategies are analyzed in detail by using a scheme in which all pure states in the 2-qubit Hilbert space are utilized for strategies. We consider two different types of symmetric games exemplified by the familiar games, the Battle of the Sexes (BoS) and the Prisoners' Dilemma (PD). These two types of symmetric games are shown to be related by a duality map, which ensures that they share common phase structures with respect to the equilibria of the strategies. We find eight distinct phase structures possible for the symmetric games, which are determined by the classical payoff matrices from which the quantum games are defined. We also discuss the possibility of resolving the dilemmas in the classical BoS, PD, and the Stag Hunt (SH) game based on the phase structures obtained in the quantum games. It is observed that quantization cannot resolve the dilemma fully for the BoS, while it generically can for the PD and SH if appropriate correlations for the strategies of the players are provided.
Chiral Lagrangian from Duality and Monopole Operators in Compactified QCD.
Cherman, Aleksey; Schäfer, Thomas; Ünsal, Mithat
2016-08-19
We show that there exists a special compactification of QCD on R^{3}×S^{1} in which the theory has a domain where continuous chiral symmetry breaking is analytically calculable. We give a microscopic derivation of the chiral Lagrangian, the chiral condensate, and the Gell-Mann-Oakes-Renner relation m_{π}^{2}f_{π}^{2}=-m_{q}⟨q[over ¯]q⟩. Abelian duality, monopole operators, and flavor-twisted boundary conditions play the main roles. The flavor twisting leads to the new effect of fractional jumping of fermion zero modes among monopole instantons. Chiral symmetry breaking is induced by monopole-instanton operators, and the Nambu-Goldstone pions arise by color-flavor transmutation from gapless "dual photons." We also give a microscopic picture of the "constituent quark" masses. Our results are consistent with expectations from chiral perturbation theory at large S^{1}, and yield strong support for adiabatic continuity between the small-S^{1} and large-S^{1} regimes. We also find concrete microscopic connections between N=1 and N=2 supersymmetric gauge theory dynamics and nonsupersymmetric QCD dynamics. PMID:27588843
Four-dimensional unsubtraction from the loop-tree duality
NASA Astrophysics Data System (ADS)
Sborlini, Germán F. R.; Driencourt-Mangin, Félix; Hernández-Pinto, Roger J.; Rodrigo, Germán
2016-08-01
We present a new algorithm to construct a purely four dimensional representation of higher-order perturbative corrections to physical cross-sections at next-to-leading order (NLO). The algorithm is based on the loop-tree duality (LTD), and it is implemented by introducing a suitable mapping between the external and loop momenta of the virtual scattering amplitudes, and the external momenta of the real emission corrections. In this way, the sum over degenerate infrared states is performed at integrand level and the cancellation of infrared divergences occurs locally without introducing subtraction counter-terms to deal with soft and final-state collinear singularities. The dual representation of ultraviolet counter-terms is also discussed in detail, in particular for self-energy contributions. The method is first illustrated with the scalar three-point function, before proceeding with the calculation of the physical cross-section for {γ}^{ast}to qoverline{q}(g) , and its generalisation to multi-leg processes. The extension to next-to-next-to-leading order (NNLO) is briefly commented.
Duality picture of Superconductor-insulator transitions on Superconducting nanowire.
Makise, Kazumasa; Terai, Hirotaka; Tominari, Yukihiro; Tanaka, Shukichi; Shinozaki, Bunju
2016-01-01
In this study, we investigated the electrical transport properties of niobium titanium nitride (NbTiN) nanowire with four-terminal geometries to clarify the superconducting phase slip phenomena and superconducting-insulator transitions (SIT) for one-dimensional superconductors. We fabricated various nanowires with different widths and lengths from epitaxial NbTiN films using the electron beam lithography method. The temperature dependence of resistance R(T) below the superconducting transition temperature Tc was analyzed using thermal activation phase slip (TAPS) and quantum phase slip (QPS) theories. Although the accuracy of experimental data at low temperatures can deviate when using the TAPS model, the QPS model thoroughly represents the R(T) characteristic with resistive tail at low temperatures. From the analyses of data on Tc, we found that NbTiN nanowires exhibit SIT because of the change in the ratio of kinetic inductance energy and QPS amplitude energy with respect to the flux-charge duality theory. PMID:27311595
Chiral Lagrangian from Duality and Monopole Operators in Compactified QCD
NASA Astrophysics Data System (ADS)
Cherman, Aleksey; Schäfer, Thomas; Ünsal, Mithat
2016-08-01
We show that there exists a special compactification of QCD on R3×S1 in which the theory has a domain where continuous chiral symmetry breaking is analytically calculable. We give a microscopic derivation of the chiral Lagrangian, the chiral condensate, and the Gell-Mann-Oakes-Renner relation mπ2fπ2=-mq⟨q ¯ q ⟩ . Abelian duality, monopole operators, and flavor-twisted boundary conditions play the main roles. The flavor twisting leads to the new effect of fractional jumping of fermion zero modes among monopole instantons. Chiral symmetry breaking is induced by monopole-instanton operators, and the Nambu-Goldstone pions arise by color-flavor transmutation from gapless "dual photons." We also give a microscopic picture of the "constituent quark" masses. Our results are consistent with expectations from chiral perturbation theory at large S1, and yield strong support for adiabatic continuity between the small-S1 and large-S1 regimes. We also find concrete microscopic connections between N =1 and N =2 supersymmetric gauge theory dynamics and nonsupersymmetric QCD dynamics.
Duality picture of Superconductor-insulator transitions on Superconducting nanowire
NASA Astrophysics Data System (ADS)
Makise, Kazumasa; Terai, Hirotaka; Tominari, Yukihiro; Tanaka, Shukichi; Shinozaki, Bunju
2016-06-01
In this study, we investigated the electrical transport properties of niobium titanium nitride (NbTiN) nanowire with four-terminal geometries to clarify the superconducting phase slip phenomena and superconducting-insulator transitions (SIT) for one-dimensional superconductors. We fabricated various nanowires with different widths and lengths from epitaxial NbTiN films using the electron beam lithography method. The temperature dependence of resistance R(T) below the superconducting transition temperature Tc was analyzed using thermal activation phase slip (TAPS) and quantum phase slip (QPS) theories. Although the accuracy of experimental data at low temperatures can deviate when using the TAPS model, the QPS model thoroughly represents the R(T) characteristic with resistive tail at low temperatures. From the analyses of data on Tc, we found that NbTiN nanowires exhibit SIT because of the change in the ratio of kinetic inductance energy and QPS amplitude energy with respect to the flux-charge duality theory.
Duality methods in networks, computer science models, and disordered condensed matter systems
NASA Astrophysics Data System (ADS)
Mitchell, Joseph Dan
In this thesis, I explore lattice independent duality and systems to which it can be applied. I first demonstrate classical duality on models in an external field, including the Ising, Potts, and x -- y models, showing in particular how this modifies duality to be lattice independent and applicable to networks. I then present a novel application of duality on the boolean satsifiability problem, one of the most important problems in computational complexity, through mapping to a low temperature Ising model. This establishes the equivalence between boolean satisfiability and a problem of enumerating the positive solutions to a Diophantine system of equations. I continue by combining duality with a prominent tool for models on networks, belief propagation, deriving a new message passing procedure, dual belief propagation. In the final part of my thesis, I shift to propose and examine a semiclassical model, the two-component Coulomb glass model, which can explain the giant magnetoresistance peak present in disordered films near a superconductor-insulator transition as the effect of competition between single particle and localized pair transport. I numerically analyze the density of states and transport properties of this model.
Neutron Spin Structure in the Resonance Region and Quark-Hadron Duality
Patricia Solvignon
2005-06-02
Quark-Hadron duality has been experimentally demonstrated for the spin independent structure function F{sub 2}. Duality is observed when, at the same value of scaling variable x{sub bj}, the smooth scaling curve at high momentum transfer becomes an average over the resonances at lower momentum transfer. Jefferson Lab experiment 01-012 used the polarized {sup 3}He target in Hall A for an extraction of the neutron spin structure function g{sub 1}{sup n} and the virtual photon asymmetry A{sub 1}{sup n} in the resonance region over a Q{sup 2} range from 1.0 to 4.0 (GeV/c){sup 2}. Data from E01-012 combined with Deep Inelastic Scattering data will provide a test of quark-hadron duality predictions for g{sub 1}{sup n} and A{sub 1}{sup n}. This will be one of the first tests of the spin and flavor dependence of quark-hadron duality. The demonstration of duality for spin structure functions will enable us to use the resonance data to study the nucleon spin structure in the large x{sub bj} region.
Power centroid radar and its rise from the universal cybernetics duality
NASA Astrophysics Data System (ADS)
Feria, Erlan H.
2014-05-01
Power centroid radar (PC-Radar) is a fast and powerful adaptive radar scheme that naturally surfaced from the recent discovery of the time-dual for information theory which has been named "latency theory." Latency theory itself was born from the universal cybernetics duality (UC-Duality), first identified in the late 1970s, that has also delivered a time dual for thermodynamics that has been named "lingerdynamics" and anchors an emerging lifespan theory for biological systems. In this paper the rise of PC-Radar from the UC-Duality is described. The development of PC-Radar, US patented, started with Defense Advanced Research Projects Agency (DARPA) funded research on knowledge-aided (KA) adaptive radar of the last decade. The outstanding signal to interference plus noise ratio (SINR) performance of PC-Radar under severely taxing environmental disturbances will be established. More specifically, it will be seen that the SINR performance of PC-Radar, either KA or knowledgeunaided (KU), approximates that of an optimum KA radar scheme. The explanation for this remarkable result is that PC-Radar inherently arises from the UC-Duality, which advances a "first principles" duality guidance theory for the derivation of synergistic storage-space/computational-time compression solutions. Real-world synthetic aperture radar (SAR) images will be used as prior-knowledge to illustrate these results.
Teaching Politically Correct Language
ERIC Educational Resources Information Center
Tsehelska, Maryna
2006-01-01
This article argues that teaching politically correct language to English learners provides them with important information and opportunities to be exposed to cultural issues. The author offers a brief review of how political correctness became an issue and how being politically correct influences the use of language. The article then presents…
Unique Rural District Politics
ERIC Educational Resources Information Center
Farmer, Tod Allen
2009-01-01
The politics of rural educational leadership are both intense and concentrated. Rural educational leaders need to be savvy and politically skilled if they are to inspire educational stakeholders and accomplish organizational objectives. The local school system is an organization with a political culture that can be characterized as a competitive…
ERIC Educational Resources Information Center
Moreira, Silvio; Batista, David S.; Carvalho, Paula; Couto, Francisco M.; Silva, Mario J.
2013-01-01
Purpose: POWER is an ontology of political processes and entities. It is designed for tracking politicians, political organizations and elections, both in mainstream and social media. The aim of this paper is to propose a data model to describe political agents and their relations over time. Design/methodology/approach: The authors propose a data…
ERIC Educational Resources Information Center
Deutsch, Morton
1983-01-01
Political psychology is the study of the bidirectional interaction of political and psychological processes. This academic discipline was founded after the First World War by Harold D. Lasswell. The content of political psychology is discussed and illustrative studies of the field are briefly summarized. (CS)
ERIC Educational Resources Information Center
Dag, Nilgun; Sozer, Mehmet Akif; Sel, Burcu
2015-01-01
Political education is a term with negative associations and triggering prejudiced approaches and discourses--maybe some paranoid thoughts--like "keep politics away from education!" in the minds of several people. This article deals with "political education" phenomenon almost never discussed and made subject to scientific…
NASA Astrophysics Data System (ADS)
2011-03-01
Remarkable progress has been achieved in the last 10 years in the quantitative understanding of gauge/string duality. For the first time it now appears that it will be possible to find the exact solution of a 4-dimensional interacting quantum field theory. This should have important implications for our understanding of other strongly coupled gauge theories such as Quantum Chromodynamics. The most studied is the most symmetric example of a gauge-string duality—the correspondence between the maximally supersymmetric gauge theory in flat 4 dimensions and superstring theory in a curved space AdS5×S5, also refered to as AdS/CFT duality. The solvability of this model, allowing us for example to compute the dimensions of gauge invariant operators for any value of the coupling, is due to its hidden integrability. At weak coupling this integrability is seen by identifying the dilatation operator which acts on single trace operators in the gauge theory with the Hamiltonian of an integrable 1-dimensional spin chain. At strong coupling, where the operators of the gauge theory are most easily identifiable as string states, integrability is manifested by the underlying integrability of the sigma model defined on the string world sheet. As a result, the exact quantum spectrum is determined by a set of thermodynamic Bethe Ansatz equations. These remarkable developments are based on a wide range of techniques from quantum field theory, condensed matter theory and mathematical physics and were reviewed in a special issue published two years ago: Kristjansen C, Staudacher M and Tseytlin A (ed) 2009 Integrability and the AdS/CFT correspondence J. Phys. A: Math. Theor. 42 250301 The present special issue is an update: it contains three long reviews by Didina Serban, Benoit Vicedo and Dmytro Volin that cover recent developments and also present a few particular directions in a detailed pedagogical manner. It starts with a review by Serban [1], where the integrabilitity of the
Unity and Duality in Barack Obama's "A More Perfect Union"
ERIC Educational Resources Information Center
Terrill, Robert E.
2009-01-01
Faced with a racialized political crisis that threatened to derail his campaign to become the first African American president of the United States, Barack Obama delivered a speech on race titled "A More Perfect Union." He begins by portraying himself as an embodiment of double consciousness, but then invites his audience to share his doubled…
What price politics? Scientists and political controversy.
Nye, M J
1999-01-01
There is a long tradition within scientific communities that encourages governments, patrons and citizens to enlist scientific expertise in the service of the public good. However, since the 17th century, scientists who have engaged in public political controversy have often been judged harshly by scientific colleagues, as well as by political adversaries. Some prominent scientists were politically active in Germany, France and England during the 1920s and 1930s; controversial stands were taken by the British physicist P.M.S. Blackett and the American chemist Linus C. Pauling against their countries' nuclear weapons policy following the Second World War. PMID:10643131
ERIC Educational Resources Information Center
Cheong, Yong Wook; Song, Jinwoong
2014-01-01
There is no consensus on the genuine meaning of wave-particle duality and the interpretation of quantum theory. How can we teach duality and quantum theory despite this lack of consensus? This study attempts to answer this question. This research argues that reality issues are at the core of both the endless debates concerning the interpretation…
Krakauer, E.
1992-01-01
This paper explores the relationship between medicine and politics, between medical management of the human body and governmental management of the body politic. It argues that the increasing complexity both of society and of governmental administration of society in the modern age has made it impossible completely to separate medicine from politics. It demonstrates that, along with great potential for social benefit, "medico-politics" brought with it great danger; much harm has been done purportedly to heal the body politic. The paper concludes by suggesting a way for physicians to minimize this danger. Images FIG. 1 PMID:1285451
Stochastic duality of ASEP with two particle types via symmetry of quantum groups of rank two
NASA Astrophysics Data System (ADS)
Kuan, Jeffrey
2016-03-01
We study two generalizations of the asymmetric simple exclusion process (ASEP) with two types of particles, which will be called type A 2 ASEP and type C 2 ASEP. Particles of type 1 force particles of type 2 to switch places. In the C 2 case, particles of type 2 can only influence the jump rates of particles of type 1, and in the A 2 case particles of type 2 do not influence particles of type 1 at all. We prove that the processes are self-dual and explicitly write the duality function, which is a generalization of the self-duality function for ASEP. The construction and proofs of duality are accomplished using symmetry of the quantum groups {{ U }}q({{gl}}3) and {{ U }}q({{sp}}4) for the A 2 and C 2 ASEP respectively.
Polemics in Public: Poncelet, Gergonne, Plücker, and the Duality Controversy.
Lorenat, Jemma
2015-12-01
A plagiarism charge in 1827 sparked a public controversy centered between Jean-Victor Poncelet (1788-1867) and Joseph-Diez Gergonne (1771-1859) over the origin and applications of the principle of duality in geometry. Over the next three years and through the pages of various journals, monographs, letters, reviews, reports, and footnotes, vitriol between the antagonists increased as their potential publicity grew. While the historical literature offers valuable resources toward understanding the development, content, and applications of geometric duality, the hostile nature of the exchange seems to have deterred an in-depth textual study of the explicitly polemical writings. We argue that the necessary collective endeavor of beginning and ending this controversy constitutes a case study in the circulation of geometry. In particular, we consider how the duality controversy functioned as a medium of communicating new fundamental principles to a wider audience of practitioners. PMID:26554642
Horizon-preserving dualities and perturbations in non-canonical scalar field cosmologies
Geshnizjani, Ghazal; Kinney, William H.; Dizgah, Azadeh Moradinezhad E-mail: whkinney@buffalo.edu
2012-02-01
We generalize the cosmological duality between inflation and cyclic contraction under the interchange a↔H to the case of non-canonical scalar field theories with varying speed of sound. The single duality in the canonical case generalizes to a family of three dualities constructed to leave the cosmological acoustic horizon invariant. We find three classes of models: (I) DBI inflation, (II) the non-canonical generalization of cyclic contraction, and (III) a new cosmological solution with rapidly decreasing speed of sound and relatively slowly growing scale factor, which we dub stalled cosmology. We construct dual analogs to the inflationary slow roll approximation, and solve for the curvature perturbation in all three cases. Both cyclic contraction and stalled cosmology predict a strongly blue spectrum for the curvature perturbations inconsistent with observations.
Heterotic-type IIA duality and degenerations of K3 surfaces
NASA Astrophysics Data System (ADS)
Braun, A. P.; Watari, T.
2016-08-01
We study the duality between four-dimensional N = 2 compactifications of heterotic and type IIA string theories. Via adiabatic fibration of the duality in six dimensions, type IIA string theory compactified on a K3-fibred Calabi-Yau threefold has a potential heterotic dual compactification. This adiabatic picture fails whenever the K3 fibre degenerates into multiple components over points in the base of the fibration. Guided by monodromy, we identify such degenerate K3 fibres as solitons generalizing the NS5-brane in heterotic string theory. The theory of degenerations of K3 surfaces can then be used to find which solitons can be present on the heterotic side. Similar to small instanton transitions, these solitons escort singular transitions between different Calabi-Yau threefolds. Starting from well-known examples of heterotic-type IIA duality, such transitions can take us to type IIA compactifications with unknown heterotic duals.
Hacker, Jacob S
2008-01-01
The greatest lesson of the failure of comprehensive health reform in the early 1990s is that politics comes first. Even the best-laid policy plans are worthless if they lack the political support to pass. Putting politics first means avoiding the overarching mistake of the Clinton reformers: envisioning a grand policy compromise rather than hammering out a real political compromise. It also means addressing the inevitable fears of those who believe that they are well protected by our eroding employment-based system. And it means formulating political strategies that are premised on the contemporary realities of the hyperpolarized U.S. political environment, rather than wistfully recalled images of the bipartisan politics of old.
Hacker, Jacob S
2008-01-01
The greatest lesson of the failure of comprehensive health reform in the early 1990s is that politics comes first. Even the best-laid policy plans are worthless if they lack the political support to pass. Putting politics first means avoiding the overarching mistake of the Clinton reformers: envisioning a grand policy compromise rather than hammering out a real political compromise. It also means addressing the inevitable fears of those who believe that they are well protected by our eroding employment-based system. And it means formulating political strategies that are premised on the contemporary realities of the hyperpolarized U.S. political environment, rather than wistfully recalled images of the bipartisan politics of old. PMID:18474963
American Political Behavior. Revised Edition.
ERIC Educational Resources Information Center
Mehlinger, Howard D.; Patrick, John J.
This textbook is designed to increase political knowledge and sophistication about the U.S. political system. The volume consisting of five units tries to capture the vitality and drama of politics through the use of cases that describe the political activities of typical citizens and political leaders. Simulations, games, political attitude…
The politics of researching global health politics
Rushton, Simon
2015-01-01
In this comment, I build on Shiffman’s call for the global health community to more deeply investigate structural and productive power. I highlight two challenges we must grapple with as social scientists carrying out the types of investigation that Shiffman proposes: the politics of challenging the powerful; and the need to investigate types of expertise that have traditionally been thought of as ‘outside’ global health. In doing so, I argue that moving forward with the agenda Shiffman sets out requires social scientists interested in the global politics of health to be reflexive about our own exercise of structural and productive power and the fact that researching global health politics is itself a political undertaking. PMID:25905482
Political Information Content and Children's Political Socialization.
ERIC Educational Resources Information Center
Sandell, Karin L.; Ostroff, David H.
1981-01-01
A content analysis of television programs presented during times likely to have high proportions of children in the audience indicated that entertainment programs contain messages about the political system which are often negative or inaccurate. (Author/MER)
Splitting spacetime and cloning qubits: linking no-go theorems across the ER=EPR duality
NASA Astrophysics Data System (ADS)
Bao, Ning; Pollack, Jason; Remmen, Grant N.
2015-11-01
We analyze the no-cloning theorem in quantum mechanics through the lens of the proposed ER=EPR (Einstein-Rosen = Einstein-Podolsky-Rosen) duality between entanglement and wormholes. In particular, we find that the no-cloning theorem is dual on the gravity side to the no-go theorem for topology change, violating the axioms of which allows for wormhole stabilization and causality violation. Such a duality between important no-go theorems elucidates the proposed connection between spacetime geometry and quantum entanglement.
Local duality in spin structure functions g1(p) and g1(d)
Yelena Prok
2006-02-01
Inclusive double spin asymmetries obtained by scattering polarized electrons off polarized protons and deuterons have been analyzed to address the issue of quark hadron duality in the polarized spin structure functions gp 1 and gd 1. A polarized electron beam, solid polarized NH3 and ND3 targets and the CEBAF Large Acceptance Spectrometer (CLAS) in Hall B were used to collect the data. The resulting gp 1 and gd 1 were averaged over the nucleon resonance energy region (M
Color-kinematics duality and the Regge limit of inelastic amplitudes
NASA Astrophysics Data System (ADS)
Vera, Agustín Sabio; Campillo, Eduardo Serna; Vázquez-Mozo, Miguel Á.
2013-04-01
We investigate tree-level five-point amplitudes in scalar-QCD expressed in terms of Sudakov variables and find the equivalent "gravitational" counterparts using the color-kinematics duality proposed by Bern, Carrasco, and Johansson. Taking the multi-Regge limit in the gravitational amplitudes, we show that those pieces in the coupling of two reggeized gravitons to one on-shell graviton directly stemming from the double copy of the vertex for two reggeized gluons to one on-shell gluon are universal and properly reproduced by the duality.
Confirmation of quark-hadron duality in the neutron F_2 structure function
Simona Malace, Yonatan Kahn, Wolodymyr Melnitchouk, Cynthia Keppel
2010-03-01
Using a recently developed technique we extract the neutron F_2^n structure function from new inclusive proton and deuteron data in the large-x region, and test the validity of quark-hadron duality in the neutron. We establish for the first time the accuracy of duality in the low-lying neutron resonance regions over a range of Q^2, and compare with the corresponding results on the proton. Our findings open the possibility of using averaged resonance region data to constrain parton distributions at large x.
Implementation of the Duality between Wilson Loops and Scattering Amplitudes in QCD
Makeenko, Yuri; Olesen, Poul
2009-02-20
We generalize modern ideas about the duality between Wilson loops and scattering amplitudes in N=4 super Yang-Mills theory to large-N (or quenched) QCD. We show that the area-law behavior of asymptotically large Wilson loops is dual to the Regge-Veneziano behavior of scattering amplitudes at high energies and fixed momentum transfer, when the quark mass is small and/or the number of particles is large. We elaborate on this duality for string theory in flat space, identifying the asymptotes of the disk amplitude and the Wilson loop of large-N QCD.
NASA Technical Reports Server (NTRS)
Shaw, Robert J.
2003-01-01
Projects can, and do, succeed because of politics. And they can fail due to politics, as well. Politics does not have to be a dirty word, if it means working closely and openly with customers and stakeholder s; it is an essential approach that requires continuous dedication of time and attention. Project management is a people industry. Gainin g the trust of your followers will grant you more influence than any formal authority.
NASA Astrophysics Data System (ADS)
Steele, John M.
The relationship between astronomy and politics is a complex but important part of understanding the practice of astronomy throughout history. This chapter explores some of the ways that astronomy, astrology, and politics have interacted, placing particular focus on the way that astronomy and astrology have been used for political purposes by both people in power and people who wish to influence a ruler's policy. Also discussed are the effects that politics has had on the development of astronomy and, in particular, upon the recording and preservation of astronomical knowledge.
Harris, Christine R; Henniger, Nicole E
2013-01-01
In the last 5 years, the phrase "politics of envy" has appeared more than 621 times in English-language newspapers, generally in opinion essays contending that political liberalism reflects and exploits feelings of envy. Oddly, this assertion has not been tested empirically. We did so with a large adult sample (n = 357). Participants completed a Dispositional Envy Scale and questions about political ideology, socioeconomic status, and age. Envy and age were moderately correlated; younger people reported greater envy. Political ideology and envy were weakly correlated; however, this relationship was not significant when controlling for age. PMID:23471177
Sonic booms and diffusion wakes generated by a heavy quark in thermal gauge-string duality.
Gubser, Steven S; Pufu, Silviu S; Yarom, Amos
2008-01-11
We evaluate the Poynting vector generated by a heavy quark moving through a thermal state of N=4 gauge theory using the gauge-string duality. A significant diffusion wake is observed as well as a Mach cone. We discuss the ratio of the energy going into sound modes to the energy coming in from the wake. PMID:18232753
N-person differential games. Part 1: Duality-finite element methods
NASA Technical Reports Server (NTRS)
Chen, G.; Zheng, Q.
1983-01-01
The duality approach, which is motivated by computational needs and is done by introducing N + 1 Language multipliers is addressed. For N-person linear quadratic games, the primal min-max problem is shown to be equivalent to the dual min-max problem.
5D/4D U-dualities and N=8 black holes
Ceresole, Anna; Ferrara, Sergio; Gnecchi, Alessandra
2009-12-15
We use the connection between the U-duality groups in d=5 and d=4 to derive properties of the N=8 black hole potential and its critical points (attractors). This approach allows us to study and compare the supersymmetry features of different solutions.
How to Teach Hicksian Compensation and Duality Using a Spreadsheet Optimizer
ERIC Educational Resources Information Center
Ghosh, Satyajit; Ghosh, Sarah
2007-01-01
Principle of duality and numerical calculation of income and substitution effects under Hicksian Compensation are often left out of intermediate microeconomics courses because they require a rigorous calculus based analysis. But these topics are critically important for understanding consumer behavior. In this paper we use excel solver--a…
Vocational Training in India and the Duality Principle: A Case for Evidence-Based Reform
ERIC Educational Resources Information Center
Mehrotra, Santosh; Kalaiyarasan, A.; Kumra, Neha; Ravi Raman, K.
2015-01-01
This article explores the notion of the duality principle, as embodied in the German dual system of Vocational Education and Training (VET), within the context of a field survey of skill shortages faced by German and Indian firms operating in India. The study finds that these firms experience problems with the quantity and quality of skills…
Sonic Booms and Diffusion Wakes Generated by a Heavy Quark in Thermal Gauge-String Duality
Gubser, Steven S.; Pufu, Silviu S.; Yarom, Amos
2008-01-11
We evaluate the Poynting vector generated by a heavy quark moving through a thermal state of N=4 gauge theory using the gauge-string duality. A significant diffusion wake is observed as well as a Mach cone. We discuss the ratio of the energy going into sound modes to the energy coming in from the wake.
The Duality of Zero in the Transition from Arithmetic to Algebra
ERIC Educational Resources Information Center
Gallardo, Aurora; Hernandez, Abraham
2005-01-01
This article shows that the recognition of the dualities in equality (operator-equivalent) of the minus sign (unary-binary) and the zero (nullity-totality) during the transitional process from arithmetic to algebra by 12-13 year-old students constitutes a possible way to achieve the extension of the natural number domain to the integers. (Contains…
ERIC Educational Resources Information Center
Ayene, Mengesha; Kriek, Jeanne; Damtie, Baylie
2011-01-01
Quantum mechanics is often thought to be a difficult subject to understand, not only in the complexity of its mathematics but also in its conceptual foundation. In this paper we emphasize students' depictions of the uncertainty principle and wave-particle duality of quantum events, phenomena that could serve as a foundation in building an…
Symmetry and Degeneracy in Quantum Mechanics. Self-Duality in Finite Spin Systems
ERIC Educational Resources Information Center
Osacar, C.; Pacheco, A. F.
2009-01-01
The symmetry of self-duality (Savit 1980 "Rev. Mod. Phys. 52" 453) of some models of statistical mechanics and quantum field theory is discussed for finite spin blocks of the Ising chain in a transverse magnetic field. The existence of this symmetry in a specific type of these blocks, and not in others, is manifest by the degeneracy of their…
Geometric representation of the generator of duality in massless and massive p-form field theories
Contreras, Ernesto; Martinez, Yisely; Leal, Lorenzo
2010-11-15
We study the invariance under duality transformations in massless and massive p-form field theories and obtain the Noether generators of the infinitesimal transformations that correspond to this symmetry. These generators can be realized in geometrical representations that generalize the loop representation of the Maxwell field, allowing for a geometrical interpretation which is studied.
Non-Abelian duality and confinement: From N=2 to N=1 supersymmetric QCD
Shifman, M.; Yung, A.
2011-05-15
Recently, we discovered and discussed non-Abelian duality in the quark vacua of N=2 super-Yang-Mills theory with the U(N) gauge group and N{sub f} flavors (N{sub f}>N). Both theories from the dual pair support non-Abelian strings, which confine monopoles. Now we introduce an N=2-breaking deformation, a mass term {mu}A{sup 2} for the adjoint fields. Starting from a small deformation, we eventually make it large, which enforces complete decoupling of the adjoint fields. We show that the above non-Abelian duality fully survives in the limit of N=1 supersymmetric QCD (SQCD), albeit some technicalities change. For instance, non-Abelian strings which used to be Bogomol'nyi-Prasad-Sommerfield saturated in the N=2 limit, cease to be saturated in N=1 SQCD. Our duality is a distant relative of Seiberg's duality in N=1 SQCD. Both share some common features, but have many drastic distinctions. This is due to the fact that Seiberg's duality apply to the monopole rather than quark vacua. More specifically, in our theory we deal with N
Jury Selection as Political Action.
ERIC Educational Resources Information Center
Fowlkes, Diane L.; And Others
Three political scientists diagnose the current state of political influence on jury selection in political trials, based upon personal experience, upon the literature of political theory, justice, and law, and upon recent action of lawyers, judges, defense committees, and some defendants. Political trials are interpreted as formal examinations of…
The Politics of Learning Disabilities.
ERIC Educational Resources Information Center
Kavale, Kenneth A.; Forness, Steven R.
1998-01-01
This analysis of the politics of learning disabilities finds that the balance between political and scientific aspects of learning disabilities has been disturbed, with political aspects being overly influential. Discussed in detail are the scientific side of learning disabilities, politics as advocacy, politics as ideology (especially Marxism),…
Mross, David F; Alicea, Jason; Motrunich, Olexei I
2016-07-01
We explicitly derive the duality between a free electronic Dirac cone and quantum electrodynamics in (2+1) dimensions (QED_{3}) with N=1 fermion flavors. The duality proceeds via an exact, nonlocal mapping from electrons to dual fermions with long-range interactions encoded by an emergent gauge field. This mapping allows us to construct parent Hamiltonians for exotic topological-insulator surface phases, derive the particle-hole-symmetric field theory of a half-filled Landau level, and nontrivially constrain QED_{3} scaling dimensions. We similarly establish duality between bosonic topological insulator surfaces and N=2 QED_{3}.
Mross, David F; Alicea, Jason; Motrunich, Olexei I
2016-07-01
We explicitly derive the duality between a free electronic Dirac cone and quantum electrodynamics in (2+1) dimensions (QED_{3}) with N=1 fermion flavors. The duality proceeds via an exact, nonlocal mapping from electrons to dual fermions with long-range interactions encoded by an emergent gauge field. This mapping allows us to construct parent Hamiltonians for exotic topological-insulator surface phases, derive the particle-hole-symmetric field theory of a half-filled Landau level, and nontrivially constrain QED_{3} scaling dimensions. We similarly establish duality between bosonic topological insulator surfaces and N=2 QED_{3}. PMID:27419581
Political Corruption in Japan.
ERIC Educational Resources Information Center
Reed, Steven R.; And Others
1996-01-01
Provides an overview of political corruption and its place in Japanese culture and society. Discusses recent scandals and efforts at political reform. These efforts are moving Japan from a "boss-patronage" system to a "civic-culture." Includes a table of post-war Japanese prime ministers and corruption scandals. (MJP)
Sexuality, Power, and Politics.
ERIC Educational Resources Information Center
Hartsock, Nancy C. M.
The source of contemporary attitudes toward sexuality, power, and politics is found in the literature of the ancient Greeks, specifically, Plato's "Republic" and "Symposium," Aristotle's "Politics," and the plays of Aeschylus and Aristophanes. The "Symposium" can be read as an account of how sexuality can be incorporated into the public life of…
ERIC Educational Resources Information Center
Robbin, Alice; Courtright, Christina; Davis, Leah
2004-01-01
Presents a literature review that covers the following topics related to information and communications technologies (ICTs): (1) theories of ICTs and how they frame political life; (2) normative democratic theory and concepts; (3) e-political life; and (4) research on e-government, e-governance, and e-democracy; (Contains 276 references.) (MES)
Educating for Political Activity
ERIC Educational Resources Information Center
Chitty, Clyde
2010-01-01
The term "political activity" can be interpreted in a myriad of different ways, but in this paper, it is taken to mean involvement in a variety of campaigns around issues affecting the way we live and the sort of society we want to live in. At a time when support for the main political parties has never been weaker, it is essential that teachers…
The Politics of Encyclopaedias
ERIC Educational Resources Information Center
Fozooni, Babak
2012-01-01
The paper assesses the political credibility of three encyclopaedias (Encyclopaedia Britannica, Encyclopedia of Marxism and Wikipedia) in relation to three chosen topics (Friedrich Engels's biography; the political philosophy of fascism; and, the discipline of social psychology). I was interested in discerning how entries are represented and…
America's Political Cartoon Heritage.
ERIC Educational Resources Information Center
Heitzmann, William Ray
1988-01-01
Traces the history of political cartoons in the United States from the first (Benjamin Franklin's "Unite or Die") in 1754 to the present. Discusses three requirements for effective cartoons, and identifies important cartoonists and their work. Characterizes political cartoons as one of the United States' liveliest, most enjoyable, and permanent…
Principals' Perceptions of Politics
ERIC Educational Resources Information Center
Tooms, Autumn K.; Kretovics, Mark A.; Smialek, Charles A.
2007-01-01
This study is an effort to examine principals' perceptions of workplace politics and its influence on their productivity and efficacy. A survey was used to explore the perceptions of current school administrators with regard to workplace politics. The instrument was disseminated to principals serving public schools in one Midwestern state in the…
ERIC Educational Resources Information Center
Gell, Marilyn K.
1979-01-01
Introduces the political issues to be discussed at the first White House Conference on Library and Information Services which will focus on citizen control of the information flow in view of developing demands and technology. A desired political result of the conference is the creation of a citizens' lobby. (SW)
The Prediction of Political Competencies by Political Action and Political Media Consumption
ERIC Educational Resources Information Center
Reichert, Frank
2014-01-01
Political competencies are often considered a precondition for political action; however, they are not independent of previous political participation, which may also include the frequency and the kind of political media consumption. My research aims at finding out the importance of participation in political activities in the past, as well as…
Student life - Making politics matter.
McCullough, Siobhan
2014-12-01
'What has politics got to do with nursing?' This is a question I hear often as a lecturer in nursing with a specialist interest in politics, as is the comment: 'I did not come into nursing to learn about politics.'
Renormalized Polyakov loop in the deconfined phase of SU(N) gauge theory and gauge-string duality.
Andreev, Oleg
2009-05-29
We use gauge-string duality to analytically evaluate the renormalized Polyakov loop in pure Yang-Mills theories. For SU(3), the result is in quite good agreement with lattice simulations for a broad temperature range.
Reichert, Frank
2016-05-01
This study presents evidence for the mediation effect of political knowledge through political self-efficacy (i.e. internal political efficacy) in the prediction of political participation. It employs an action theoretic approach-by and large grounded on the Theory of Planned Behaviour-and uses data from the German Longitudinal Election Study to examine whether political knowledge has distinct direct effects on voting, conventional, and/or unconventional political participation. It argues that political knowledge raises internal political efficacy and thereby indirectly increases the chance that a citizen will participate in politics. The results of mediated multiple regression analyses yield evidence that political knowledge indeed translates into internal political efficacy, thus it affects political participation of various kinds indirectly. However, internal political efficacy and intentions to participate politically yield simultaneous direct effects only on conventional political participation. Sequentially mediated effects appear for voting and conventional political participation, with political knowledge being mediated by internal political efficacy and subsequently also by behavioural intentions. The mediation patterns for unconventional political participation are less clear though. The discussion accounts for restrictions of this study and points to questions for answer by future research. PMID:27298633
Reichert, Frank
2016-05-01
This study presents evidence for the mediation effect of political knowledge through political self-efficacy (i.e. internal political efficacy) in the prediction of political participation. It employs an action theoretic approach-by and large grounded on the Theory of Planned Behaviour-and uses data from the German Longitudinal Election Study to examine whether political knowledge has distinct direct effects on voting, conventional, and/or unconventional political participation. It argues that political knowledge raises internal political efficacy and thereby indirectly increases the chance that a citizen will participate in politics. The results of mediated multiple regression analyses yield evidence that political knowledge indeed translates into internal political efficacy, thus it affects political participation of various kinds indirectly. However, internal political efficacy and intentions to participate politically yield simultaneous direct effects only on conventional political participation. Sequentially mediated effects appear for voting and conventional political participation, with political knowledge being mediated by internal political efficacy and subsequently also by behavioural intentions. The mediation patterns for unconventional political participation are less clear though. The discussion accounts for restrictions of this study and points to questions for answer by future research.
Political leadership and the politics of nursing.
Davies, Celia
2004-07-01
This article provides a critical examination of the concept of political leadership as it has recently developed in the field of nursing, arguing that despite its undoubted usefulness, there are important issues that it obscures. Using five guiding questions, it is proposed that a focus on political leadership is inward-looking and individualizing. It encourages a view of the profession as immature and it emphasizes separation instead of alliance formation. An alternative perspective starting from an assumption that nursing operates in a position of cultural and structural disadvantage is proposed. A close analysis of the government's strategy for nursing in England confirms the continuing cultural ambiguity that surrounds nursing. This enables a number of questions to be posed concerning where nursing fits in relation to current health policy on workforce change and raises doubts about just how far the historical neglect of nursing in policy arenas has been overcome.
Lifelong Political Socialization, Consciousness and Political Agency in Israel Today
ERIC Educational Resources Information Center
Michel, Dirk
2007-01-01
This article deals with the nexus between biographical experiences in political extraordinary times of crisis, disaster and terror and their influence on political orientations. At the centre of interest is the reconstruction of political orientations related to two different historical-political groups of Jewish Germans who had immigrated or…
Political Socialization and Political Interest: The Role of School Reassessed
ERIC Educational Resources Information Center
Koskimaa, Vesa; Rapeli, Lauri
2015-01-01
There is a growing concern about the lack of political interest and engagement among Western youth. This has led to a revival of political socialization studies. One recent finding is that (late) adolescence is key to understanding the development of interest for politics. This study builds on this finding by examining political interest among…
Australia's Political Structure.
ERIC Educational Resources Information Center
Sawer, Geoffrey
1984-01-01
Australia is an independent nation-state, federally constituted under a democratic parliamentary system. Being part of the Commonwealth of Nations, with feelings of loyalty to the Crown, Australia is also a democratic monarchy. Its political structure is discussed. (RM)
Fugelli, P
1991-03-20
If doctors want to play a role in future health promotion, they have to leave their citadel, and come closer to life and society. Modern preventive medicine cannot be dissociated from basic political, cultural and religious values and processes. Genetic counseling and engineering, influencing lifestyle, community intervention and changing the health culture among patients and doctors all require ethical and political competence rather than traditional medical skills. The author advocates the development of a new discipline, medical politics, with two major commitments: -To define basic health rights -To study the public health consequences of political systems and decisions. In a polemic and provocative style the article enlightens the potentials and dangers associated with an expanded concept of preventive medicine. PMID:2042221
Hispanics: A Political Perspective.
ERIC Educational Resources Information Center
Roybal, Edward R.
1979-01-01
Provides insight into the experience of Spanish Americans in the predominantly Anglo culture of the United States and evaluates political gains made by Hispanics since the establishment of the Congressional Hispanic Caucus in 1976. (DB)
Fugelli, P
1991-03-20
If doctors want to play a role in future health promotion, they have to leave their citadel, and come closer to life and society. Modern preventive medicine cannot be dissociated from basic political, cultural and religious values and processes. Genetic counseling and engineering, influencing lifestyle, community intervention and changing the health culture among patients and doctors all require ethical and political competence rather than traditional medical skills. The author advocates the development of a new discipline, medical politics, with two major commitments: -To define basic health rights -To study the public health consequences of political systems and decisions. In a polemic and provocative style the article enlightens the potentials and dangers associated with an expanded concept of preventive medicine.
ERIC Educational Resources Information Center
Rouse, John
1979-01-01
Contends that the political philosophy underlying Mina Shaughnessy's "Errors and Expectations" is one which reinforces both the teacher's position of control and the training of minority students to follow and obey authority. (DD)
A two-dimensional integrable axionic /σ-model and T-duality
NASA Astrophysics Data System (ADS)
Balog, J.; Forgács, P.; Palla, L.
2000-07-01
An /S-matrix is proposed for the two dimensional O(3) /σ-model with a dynamical /θ-term (axion model). Exploiting an Abelian T-duality transformation connecting the axion model to an integrable SU(2)/×U(1) symmetric principal /σ-model, strong evidence is presented for the correctness of the proposed /S-matrix by comparing the perturbatively calculated free energies with the ones previously obtained by the Thermodynamical Bethe Ansatz. This T-duality transformation also leads to a new Lax-pair for both models. The quantum non-integrability of the O(3) /σ-model with a constant /θ-term, in contradistinction to the axion model, is illustrated by calculating the /2-->3 particle production amplitude to lowest order in /θ.
Large N topologically twisted index: necklace quivers, dualities, and Sasaki-Einstein spaces
NASA Astrophysics Data System (ADS)
Hosseini, Seyed Morteza; Mekareeya, Noppadol
2016-08-01
In this paper, we calculate the topological free energy for a number of {N} ≥ 2 Yang-Mills-Chern-Simons-matter theories at large N and fixed Chern-Simons levels. The topological free energy is defined as the logarithm of the partition function of the theory on S 2 × S 1 with a topological A-twist along S 2 and can be reduced to a matrix integral by exploiting the localization technique. The theories of our interest are dual to a variety of Calabi-Yau four-fold singularities, including a product of two asymptotically locally Euclidean singularities and the cone over various well-known homogeneous Sasaki-Einstein seven-manifolds, N 0,1,0, V 5,2, and Q 1,1,1. We check that the large N topological free energy can be matched for theories which are related by dualities, including mirror symmetry and SL(2,{Z}) duality.
A Generalization of Schur-Weyl Duality with Applications in Quantum Estimation
NASA Astrophysics Data System (ADS)
Marvian, Iman; Spekkens, Robert W.
2014-10-01
Schur-Weyl duality is a powerful tool in representation theory which has many applications to quantum information theory. We provide a generalization of this duality and demonstrate some of its applications. In particular, we use it to develop a general framework for the study of a family of quantum estimation problems wherein one is given n copies of an unknown quantum state according to some prior and the goal is to estimate certain parameters of the given state. In particular, we are interested to know whether collective measurements are useful and if so to find an upper bound on the amount of entanglement which is required to achieve the optimal estimation. In the case of pure states, we show that commutativity of the set of observables that define the estimation problem implies the sufficiency of unentangled measurements.
M2-brane surface operators and gauge theory dualities in Toda
NASA Astrophysics Data System (ADS)
Gomis, Jaume; Le Floch, Bruno
2016-04-01
We give a microscopic two dimensional {N} = (2, 2) gauge theory description of arbitrary M2-branes ending on N f M5-branes wrapping a punctured Riemann surface. These realize surface operators in four dimensional {N} = 2 field theories. We show that the expectation value of these surface operators on the sphere is captured by a Toda CFT correlation function in the presence of an additional degenerate vertex operator labelled by a representation {R} of SU( N f ), which also labels M2-branes ending on M5-branes. We prove that symmetries of Toda CFT correlators provide a geometric realization of dualities between two dimensional gauge theories, including {N} = (2, 2) analogues of Seiberg and Kutasov-Schwimmer dualities. As a bonus, we find new explicit conformal blocks, braiding matrices, and fusion rules in Toda CFT.
Infinite-Dimensional Schur-Weyl Duality and the Coxeter-Laplace Operator
NASA Astrophysics Data System (ADS)
Tsilevich, N. V.; Vershik, A. M.
2014-05-01
We extend the classical Schur-Weyl duality between representations of the groups and to the case of and the infinite symmetric group . Our construction is based on a "dynamic," or inductive, scheme of Schur-Weyl dualities. It leads to a new class of representations of the infinite symmetric group, which has not appeared earlier. We describe these representations and, in particular, find their spectral types with respect to the Gelfand-Tsetlin algebra. The main example of such a representation acts in an incomplete infinite tensor product. As an important application, we consider the weak limit of the so-called Coxeter-Laplace operator, which is essentially the Hamiltonian of the XXX Heisenberg model, in these representations.
A note on topological M5-branes and string-fivebrane duality
NASA Astrophysics Data System (ADS)
Bao, Ling; Cederwall, Martin; Nilsson, Bengt E. W.
2008-06-01
We derive the stability conditions for the M5-brane in topological M-theory using κ-symmetry. The non-linearly self-dual 3-form on the world-volume is necessarily non-vanishing, as is the case also for the 2-form field strengths on coisotropic branes in topological string theory. It is demonstrated that the self-duality is consistent with the stability conditions, which are solved locally in terms of a tensor in the representation 6 of SU(3)⊂G2. The double dimensional reduction of the M5-brane is the D4-brane, and its direct reduction is an NS5-brane. We show that the equation of motion for the 3-form on the NS5-brane wrapping a Calabi-Yau space is exactly the Kodaira-Spencer equation, providing support for a string-fivebrane duality in topological string theory.
D-branes in asymmetrically gauged WZW models and axial-vector duality
NASA Astrophysics Data System (ADS)
Walton, Mark A.; Zhou, Jian-Ge
2003-01-01
We construct D-branes in a left-right asymmetrically gauged WZW model, with the gauge subgroup embedded differently on the left and the right of the group element. The symmetry-preserving boundary conditions for the group-valued field g are described, and the corresponding action is found. When the subgroup H= U(1), we can implement T-duality on the axially gauged WZW action; an orbifold of the vectorially gauged theory is produced. For the parafermion SU(2)/ U(1) coset model, a σ-model is obtained with vanishing gauge field on D-branes. We show that a boundary condition surviving from the SU(2) parent theory characterizes D-branes in the parafermion theory, determining the shape of A-branes. The gauge field on B-branes is obtained from the boundary condition for A-branes, by the orbifold construction and T-duality. These gauge fields stabilize the B-branes.
Mass spectrum and thermodynamics of quasiconformal gauge theories from gauge/gravity duality
Alanen, J.; Kajantie, K.; Alho, T.; Tuominen, K.
2011-10-15
We use gauge/gravity duality to study simultaneously the mass spectrum and the thermodynamics of a generic quasiconformal gauge theory, specified by its beta function. The beta function of a quasiconformal theory almost vanishes, and the coupling is almost constant between two widely separated energy scales. Depending on whether the gravity dual has a black hole or not, the mass spectrum is either a spectrum of quasinormal oscillations or a normal T=0 mass spectrum. The mass spectrum is quantitatively correlated with the thermal properties of the system. As the theory approaches conformality, the masses have to vanish. We show that in this limit, the masses calculated via gauge/gravity duality satisfy expected scaling properties.
Electric-magnetic dualities in non-abelian and non-commutative gauge theories
NASA Astrophysics Data System (ADS)
Ho, Jun-Kai; Ma, Chen-Te
2016-08-01
Electric-magnetic dualities are equivalence between strong and weak coupling constants. A standard example is the exchange of electric and magnetic fields in an abelian gauge theory. We show three methods to perform electric-magnetic dualities in the case of the non-commutative U (1) gauge theory. The first method is to use covariant field strengths to be the electric and magnetic fields. We find an invariant form of an equation of motion after performing the electric-magnetic duality. The second method is to use the Seiberg-Witten map to rewrite the non-commutative U (1) gauge theory in terms of abelian field strength. The third method is to use the large Neveu Schwarz-Neveu Schwarz (NS-NS) background limit (non-commutativity parameter only has one degree of freedom) to consider the non-commutative U (1) gauge theory or D3-brane. In this limit, we introduce or dualize a new one-form gauge potential to get a D3-brane in a large Ramond-Ramond (R-R) background via field redefinition. We also use perturbation to study the equivalence between two D3-brane theories. Comparison of these methods in the non-commutative U (1) gauge theory gives different physical implications. The comparison reflects the differences between the non-abelian and non-commutative gauge theories in the electric-magnetic dualities. For a complete study, we also extend our studies to the simplest abelian and non-abelian p-form gauge theories, and a non-commutative theory with the non-abelian structure.
Topological membranes, current algebras and H-flux-R-flux duality based on Courant algebroids
NASA Astrophysics Data System (ADS)
Bessho, Taiki; Heller, Marc A.; Ikeda, Noriaki; Watamura, Satoshi
2016-04-01
We construct a topological sigma model and a current algebra based on a Courant algebroid structure on a Poisson manifold. In order to construct models, we reformulate the Poisson Courant algebroid by supergeometric construction on a QP-manifold. A new duality of Courant algebroids which transforms H-flux and R-flux is proposed, where the transformation is interpreted as a canonical transformation of a graded symplectic manifold.
Sewing relations and duality for BRST off-shell string tadpole amplitudes
Ordonez, C.R. ); Rey, S.; Rubin, M.A.; Zucchini, R.
1989-09-15
Using a Becchi-Rouet-Stora-Tyutin- (BRST-)invariant first-quantized formalism for closed-bosonic-string theory, we construct amplitudes for closed-string tadpoles in the conformal gauge and discuss the connection with covariant string field theory in the Siegel gauge. We also show that the application of the sewing rules, previously found for propagators, to pairs of these tadpole amplitudes yields the Klein-bottle and annulus one-loop vacuum amplitudes as required by duality and factorization.
Has Political Science Ignored Religion?
ERIC Educational Resources Information Center
Kettell, Steven
2012-01-01
A common complaint from political scientists involved in the study of religion is that religious issues have been largely overlooked by political science. Through a content analysis of leading political science and sociology journals from 2000 to 2010, this article considers the extent of this claim. The results show that political science…
ERIC Educational Resources Information Center
Kirkwood, Julieta
1983-01-01
Political parties in Chile of both the left and right have focused more on drawing women into their ideologies than on considering what political issues mean to women. A look at feminist thought shows how political life for women includes not only the traditional political arena but also domestic life. (IS)
Applications of quark-hadron duality in F2 structure function
Malace, S P
2009-09-01
Inclusive electron-proton and electron-deuteron inelastic cross sections have been measured at Jefferson Lab (JLab) in the resonance region, at large Bjorken x, up to 0.92, and four-momentum transfer squared Q2 up to 7.5 GeV2 in the experiment E00-116. These measurements are used to extend to larger x and Q2 precision, quantitative, studies of the phenomenon of quark-hadron duality. Our analysis confirms, both globally and locally, the apparent violation of quark-hadron duality previously observed at a Q2 of 3.5 GeV2 when resonance data are compared to structure function data created from CTEQ6M and MRST2004 parton distribution functions (PDFs). More importantly, our new data show that this discrepancy saturates by Q2 ~ 4 Gev2, becoming Q2 independent. This suggests only small violations of Q2 evolution by contributions from the higher-twist terms in the resonance region which is confirmed by our comparisons to ALEKHIN and ALLM97.We conclude that the unconstrained strength of the CTEQ6M and MRST2004 PDFs at large x is the major source of the disagreement between data and these parameterizations in the kinematic regime we study and that, in view of quark-hadron duality, properly averaged resonance region data could be used in global QCD fits to reduce PDF uncertainties at large x.
Testing the gas mass density profile of galaxy clusters with distance duality relation
NASA Astrophysics Data System (ADS)
Cao, Shuo; Biesiada, Marek; Zheng, Xiaogang; Zhu, Zong-Hong
2016-03-01
In this paper, assuming the validity of distance duality relation, η = DL(z)(1 + z)-2/DA(z) = 1, where DA(z) and DL(z) are the angular and the luminosity distance, respectively, we explore two kinds of gas mass density profiles of clusters: the isothermal β model and the non-isothermal double-β model. In our analysis, performed on 38 massive galaxy clusters observed by Chandra (within the redshift range of 0.14 < z < 0.89), we use two types of cluster gas mass fraction data corresponding to different mass density profiles fitted to the X-ray data. Using two general parameterizations of η(z) (phenomenologically allowing for distance duality violation), we find that the non-isothermal double-β model agrees better with the distance duality relation, while the isothermal β model tends to be marginally incompatible with the Etherington theorem at 68.3 per cent confidence level (CL). However, current accuracy of the data does not allow to distinguish between the two models for the gas-density distribution at a significant level.
Branes, geometry and N = 1 duality with product gauge groups of SO and Sp
NASA Astrophysics Data System (ADS)
Ahn, Changhyun; Oh, Kyungho; Tatar, Radu
We study N = 1 dualities in four-dimensional supersymmetric gauge theories as the world volume theory of D4 branes with one compact direction in type IIA string theory. We generalize the previous work for SO( Nc1 ) × Sp( Nc2 ) with the superpotential W = Tr X4 to the case of W = Tr X4( k+1) in terms of brane configuration. We conjecture that the new dualities for the product gauge groups of SO( Nc1 ) × Sp( Nc2 ) × SO( Nc3 ), SO( Nc1 ) × Sp( Nc2 ) × SO( Nc3 ) × Sp( Nc4 ) and higher multiple product gauge groups can be obtained by reversing the ordering of NS5 branes and D6 branes while preserving the linking numbers. We also describe the above dualities in terms of wrapping D6 branes around 3-cycles of Calabi-Yau threefolds in type IIA string theory. The theory with adjoint matter can be regarded as taking multiple copies of NS5 brane in the configuration of brane or geometric approaches.
Strong-weak coupling duality in non-abelian gauge theories
NASA Astrophysics Data System (ADS)
Ferrari, Frank
1997-05-01
This is a general introduction to electric-magnetic duality in non-abelian gauge theories. In chapter I, I review the general ideas which led in the late 70s to the idea of electric/magnetic duality in quantum field theory. In chapters II and III, I focus mainly on N=2 supersymmetric theories. I present the lagrangians and explain in more or less detail the non-renormalization theorems, rigid special geometry, supersymmetric instanton calculus, charge fractionization, the semiclassical theory of monopoles, duality in Maxwell theory and the famous Seiberg-Witten solution. I discuss various physical applications, as electric charge confinement, chiral symmetry breaking or non-trivial superconformal theories in four dimensions. In Section II.3 new material is presented, related to the computation of the eta invariant of certain Dirac operators coupled minimally to non-trivial monopole field configurations. I explain how these invariants can be obtained exactly by a one-loop calculation in a suitable N=2 supersymmetric gauge theory. This is an unexpected application of the holomorphy properties of N=2 supersymmetry, and constitutes a tremendous simplification of the usual computation. An expanded version of these new results will be published soon.
Serre duality, Abel's theorem, and Jacobi inversion for supercurves over a thick superpoint
NASA Astrophysics Data System (ADS)
Rothstein, Mitchell J.; Rabin, Jeffrey M.
2015-04-01
The principal aim of this paper is to extend Abel's theorem to the setting of complex supermanifolds of dimension 1 | q over a finite-dimensional local supercommutative C-algebra. The theorem is proved by establishing a compatibility of Serre duality for the supercurve with Poincaré duality on the reduced curve. We include an elementary algebraic proof of the requisite form of Serre duality, closely based on the account of the reduced case given by Serre in Algebraic groups and class fields, combined with an invariance result for the topology on the dual of the space of répartitions. Our Abel map, taking Cartier divisors of degree zero to the dual of the space of sections of the Berezinian sheaf, modulo periods, is defined via Penkov's characterization of the Berezinian sheaf as the cohomology of the de Rham complex of the sheaf D of differential operators. We discuss the Jacobi inversion problem for the Abel map and give an example demonstrating that if n is an integer sufficiently large that the generic divisor of degree n is linearly equivalent to an effective divisor, this need not be the case for all divisors of degree n.
The emergence of gauge invariance: The stay-at-home gauge versus local-global duality
NASA Astrophysics Data System (ADS)
Zaanen, J.; Beekman, A. J.
2012-04-01
In condensed matter physics, gauge symmetries other than the U(1) of electromagnetism are of an emergent nature. Two emergence mechanisms for gauge symmetry are well established: the way in which it arises in Kramers-Wannier type local-global dualities, and the way in which local constraints encountered in (doped) Mott insulators are encoded. We demonstrate that these gauge structures are closely related, and appear as counterparts in the canonical and field-theoretical languages. The restoration of symmetry in a disorder phase transition is due to having the original local variables subjected to a coherent superposition of all possible topological defect configurations, with the effect that correlation functions are no longer well-defined. This is completely equivalent to assigning gauge freedom to those variables. Two cases are considered explicitly: the well-known vortex duality in bosonic Mott insulators serves to illustrate the principle; and the acquired wisdom is then applied to the less familiar context of dualities in quantum elasticity, where we elucidate the relation between the quantum nematic and linearized gravity. We reflect on some deeper implications for the emergence of gauge symmetry in general.
2d Affine XY-Spin Model/4d Gauge Theory Duality and Deconfinement
Anber, Mohamed M.; Poppitz, Erich; Unsal, Mithat; /SLAC /Stanford U., Phys. Dept. /San Francisco State U.
2012-08-16
We introduce a duality between two-dimensional XY-spin models with symmetry-breaking perturbations and certain four-dimensional SU(2) and SU(2) = Z{sub 2} gauge theories, compactified on a small spatial circle R{sup 1,2} x S{sup 1}, and considered at temperatures near the deconfinement transition. In a Euclidean set up, the theory is defined on R{sup 2} x T{sup 2}. Similarly, thermal gauge theories of higher rank are dual to new families of 'affine' XY-spin models with perturbations. For rank two, these are related to models used to describe the melting of a 2d crystal with a triangular lattice. The connection is made through a multi-component electric-magnetic Coulomb gas representation for both systems. Perturbations in the spin system map to topological defects in the gauge theory, such as monopole-instantons or magnetic bions, and the vortices in the spin system map to the electrically charged W-bosons in field theory (or vice versa, depending on the duality frame). The duality permits one to use the two-dimensional technology of spin systems to study the thermal deconfinement and discrete chiral transitions in four-dimensional SU(N{sub c}) gauge theories with n{sub f} {ge} 1 adjoint Weyl fermions.
Integral group actions on symmetric spaces and discrete duality symmetries of supergravity theories
Carbone, Lisa; Murray, Scott H.; Sati, Hisham
2015-10-15
For G = G(ℝ), a split, simply connected, semisimple Lie group of rank n and K the maximal compact subgroup of G, we give a method for computing Iwasawa coordinates of K∖G using the Chevalley generators and the Steinberg presentation. When K∖G is a scalar coset for a supergravity theory in dimensions ≥3, we determine the action of the integral form G(ℤ) on K∖G. We give explicit results for the action of the discrete U-duality groups SL{sub 2}(ℤ) and E{sub 7}(ℤ) on the scalar cosets SO(2)∖SL{sub 2}(ℝ) and [SU(8)/( ± Id)]∖E{sub 7(+7)}(ℝ) for type IIB supergravity in ten dimensions and 11-dimensional supergravity reduced to D = 4 dimensions, respectively. For the former, we use this to determine the discrete U-duality transformations on the scalar sector in the Borel gauge and we describe the discrete symmetries of the dyonic charge lattice. We determine the spectrum-generating symmetry group for fundamental BPS solitons of type IIB supergravity in D = 10 dimensions at the classical level and we propose an analog of this symmetry at the quantum level. We indicate how our methods can be used to study the orbits of discrete U-duality groups in general.
Dean, S F
1987-03-01
In the preceding discussion "politics" was defined as the pursuit of power, and that pursuit of power was examined in the context of the local political scene. With this information, EMTs and paramedics may be better able to make sense of the complexities of local EMS politics and thereby relieve some of the frustration that all of us must feel as we look at a system that appears to be unresponsive and unmoving. John Naisbitt in his book Megatrends and Alvin Toffler in The Third Wave both discuss the decentralization of political power in the U.S. and the movement of power away from the federal government to state and local governments. There will probably be more opportunities, not less, for EMTs and paramedics to participate in local government decisions concerning the provision of emergency medical services in their community. Using the questions in each of the models will provide EMTS and paramedics a great deal of insight into the local political process. This will enable EMTs and paramedics to do themselves and their patients a great service by influencing the decisions made by local politicians, which will have a great impact on the quality of care that patients receive.
Women and political representation.
Rathod, P B
1999-01-01
A remarkable progress in women's participation in politics throughout the world was witnessed in the final decade of the 20th century. According to the Inter-Parliamentary Union report, there were only eight countries with no women in their legislatures in 1998. The number of women ministers at the cabinet level worldwide doubled in a decade, and the number of countries without any women ministers dropped from 93 to 48 during 1987-96. However, this progress is far from satisfactory. Political representation of women, minorities, and other social groups is still inadequate. This may be due to a complex combination of socioeconomic, cultural, and institutional factors. The view that women's political participation increases with social and economic development is supported by data from the Nordic countries, where there are higher proportions of women legislators than in less developed countries. While better levels of socioeconomic development, having a women-friendly political culture, and higher literacy are considered favorable factors for women's increased political representation, adopting one of the proportional representation systems (such as a party-list system, a single transferable vote system, or a mixed proportional system with multi-member constituencies) is the single factor most responsible for the higher representation of women.
Politics in evaluation: Politically responsive evaluation in high stakes environments.
Azzam, Tarek; Levine, Bret
2015-12-01
The role of politics has often been discussed in evaluation theory and practice. The political influence of the situation can have major effects on the evaluation design, approach and methods. Politics also has the potential to influence the decisions made from the evaluation findings. The current study focuses on the influence of the political context on stakeholder decision making. Utilizing a simulation scenario, this study compares stakeholder decision making in high and low stakes evaluation contexts. Findings suggest that high stakes political environments are more likely than low stakes environments to lead to reduced reliance on technically appropriate measures and increased dependence on measures better reflect the broader political environment. PMID:26283476
Politics in evaluation: Politically responsive evaluation in high stakes environments.
Azzam, Tarek; Levine, Bret
2015-12-01
The role of politics has often been discussed in evaluation theory and practice. The political influence of the situation can have major effects on the evaluation design, approach and methods. Politics also has the potential to influence the decisions made from the evaluation findings. The current study focuses on the influence of the political context on stakeholder decision making. Utilizing a simulation scenario, this study compares stakeholder decision making in high and low stakes evaluation contexts. Findings suggest that high stakes political environments are more likely than low stakes environments to lead to reduced reliance on technically appropriate measures and increased dependence on measures better reflect the broader political environment.
Belkin, Aaron
2013-01-01
For almost 20 years, gay rights advocates and defenders of military anti-gay discrimination engaged in a phony debate about whether allowing open service would undermine unit cohesion. To be sure, a preponderance of evidence showed that open service would not undermine cohesion, and the repeal of don't ask, don't tell (DADT) required advocates to prevail on that point in the court of public opinion. But concerns about cohesion were never the basis of opposition to open service. Rather, opposition was a modern incarnation of the politics of paranoia, a dangerous tradition in American history. Acknowledging that DADT had nothing to do with cohesion and that military leaders allowed the armed forces to be implicated in the politics of paranoia could facilitate disabling paranoia as the basis for other political projects such as anti-immigrant xenophobia. For a video on DADT and paranoia, search for "Donnelly Belkin DADT" on YoutTube.
Astronomy and political theory
NASA Astrophysics Data System (ADS)
Campion, Nicholas
2011-06-01
This paper will argue that astronomical models have long been applied to political theory, from the use of the Sun as a symbol of the emperor in Rome to the application of Copernican theory to the needs of absolute monarchy. We will begin with consideration of astral divination (the use of astronomy to ascertain divine intentions) in the ancient Near East. Particular attention will be paid to the use of Newton's discovery that the universe operates according to a single set of laws in order to support concepts of political quality and eighteenth century Natural Rights theory. We will conclude with consideration of arguments that the discovery of the expanding, multi-galaxy universe, stimulated political uncertainty in the 1930s, and that photographs of the Earth from Apollo spacecraft encouraged concepts of the `global village'.
Depression and Political Participation*
Ojeda, Christopher
2015-01-01
In this paper, I propose that depression is a political phenomenon insofar as it has political sources and consequences. I then investigate one aspect of this argument—whether depression reduces participation. I hypothesize that individuals with depression lack the motivation and physical capacity to vote and engage in other forms of political participation due to somatic problems and feelings of hopelessness and apathy. Moreover, I examine how depression in adolescence can have downstream consequences for participation in young adulthood. The analyses, using both cross-sectional and longitudinal data, show that voter turnout and other forms of participation decrease as the severity of depressed mood increases. These findings are discussed in light of disability rights and potential efforts to boost participation among this group. PMID:26924857
Porter, G.; Brown, J.W.
1991-01-01
The authors explore past international environmental negotiations and the broader political landscape in which they take place to discern some elements of success. The overridding message is that it may take a long time, but in the end some combination of new scientific evidence, domestic political pressures, and international persuasion will likely turn the tide in favor of cooperative action. The authors feel that an incremental change approach, based on current international environmental governance, is the one most likely to be followed, although global governance, with a greatly strengthened UN and environmental law, or global partnership, developmental assistance from richer countries to poorer countries, are the better choices.
Albert Einstein and Friedrich Dessauer: Political Views and Political Practice
NASA Astrophysics Data System (ADS)
Goenner, Hubert
In this case study I compare the political views of the physicists Albert Einstein and Friedrich Dessauer between the first and second world wars, and I investigate their translation into concrete political practice. Both departed from their roles as experts in physics in favor of political engagement. The essence of Einstein's political practice seems to have been a form of political participation in exerting moral influence on people and organizations through public declarations and appeals in isolation from political mass movements. Dessauer exerted political influence both through public office (as a member of Parliament for the Catholic Center Party) and by acquiring a newspaper. The different political practice of both Einstein and Dessauer were unsuccessful in thwarting the Nazi takeover.
ERIC Educational Resources Information Center
Whiting, Pat
1977-01-01
A state representative from Oregon uses his state as example for political action regarding critical sociobiological issues having great bearing on world ecosystems: pollution, energy-resource allocation, and population density. Discusses ozone depletion, use of fluorocarbons, and the Oregon Energy Policy. Suggests methods of involving educators.…
ERIC Educational Resources Information Center
Galston, Arthur W.
1970-01-01
Advocates that some established botanists should become involved in social and political problems to which botanical expertise is relevant. Discusses food production in relation to world population growth, indicating problems on which botanical knowledge and research should be brought to bear. Discusses herbicides and plant growth regulators as…
ERIC Educational Resources Information Center
Taft, Charles P.; Felknor, Bruce L.
This monograph, written in 1960, examines the part prejudice played in politics throughout our national history. Part I of the monograph discusses "The Colonial Era." The immigrants that populated the new nation brought with them varied cultural heritages and different religious faiths. Soon the colonial pattern of religious prejudice reflected…
Political Communication Yearbook 1984.
ERIC Educational Resources Information Center
Sanders, Keith R., Ed.; And Others
Focusing on current scholarship in the evolving field of political communication, this publication is organized in three sections. Part 1, "Current Perspectives on the Spiral of Silence," features essays by Charles T. Salmon and F. Gerald Kline, Klaus Merten, Carroll J. Glynn and Jack M. McLeod, and a response by the theory's original positor,…
Politics of Character Education
ERIC Educational Resources Information Center
Howard, Robert W.; Berkowitz, Marvin W.; Schaeffer, Esther F.
2004-01-01
Character education's history in the United States goes back to the beginning of public schools. The emphasis and profile has waxed and waned, frequently with political trends. The current standards-based environment poses particular threats and challenges to character education. In spite of these pressures, character education continues and - by…
Political Correctness--Correct?
ERIC Educational Resources Information Center
Boase, Paul H.
1993-01-01
Examines the phenomenon of political correctness, its roots and objectives, and its successes and failures in coping with the conflicts and clashes of multicultural campuses. Argues that speech codes indicate failure in academia's primary mission to civilize and educate through talk, discussion, thought,166 and persuasion. (SR)
Lifelong Learning and Politics.
ERIC Educational Resources Information Center
Richardson, Penelope L.
1979-01-01
States that community colleges are in a good position to be centers of lifelong education and that adult educators must engage in politics in order to promote learning opportunities for adults. Suggests legislative, administrative, judicial, and electoral strategies for adult educators to use in influencing policymakers to support lifelong…
Politics 3. Memorandum Report.
ERIC Educational Resources Information Center
Maslow, A. H.
Maslow's Politics 3 is a humanistic social psychological philosophy which is against any attitude or value that rests on a merely evil or good conception of human nature or of society. His thoughts and clippings on the subject which were written or collected during 1968, 1969, and 1970 are presented in two primary thought sequences: 1) what is…
Political Campaign Techniques.
ERIC Educational Resources Information Center
Institute for Political/Legal Education, Sewell, NJ.
Techniques, materials, and coordinating efforts used in a political campaign are outlined for high school students. The objective is to familiarize students with these techniques so that they can become effective campaign volunteers. Topics include the candidate and the press, campaign publicity materials, organization of headquarters, receptions,…
Ditto, Peter H; Wojcik, Sean P; Chen, Eric Evan; Grady, Rebecca Hofstein; Ringel, Megan M
2015-01-01
Duarte et al. are right to worry about political bias in social psychology but they underestimate the ease of correcting it. Both liberals and conservatives show partisan bias that often worsens with cognitive sophistication. More non-liberals in social psychology is unlikely to speed our convergence upon the truth, although it may broaden the questions we ask and the data we collect.
Science Education and Politics.
ERIC Educational Resources Information Center
Jungwirth, Ehud
1981-01-01
Presents several examples of the interface of science teaching and politics. Supports the notion of a double function in teaching biology: (1) to educate a young person for critical observation, independent judgment, and responsible action; and (2) to prepare him for the future. (CS)
ERIC Educational Resources Information Center
League of United Latin American Citizens, Washington, DC.
Written to help Hispanics understand the electoral process more thoroughly and to encourage them to participate more actively in the political arena, this manual begins by describing the present status of the Hispanic electorate and then explains how laws are made, how Hispanics can influence legislation, and how to organize a voter registration…
ERIC Educational Resources Information Center
Stevens, Richard G.
1984-01-01
The meaning and understanding of conscience in political thought are examined. The problem of distinguishing apparent and real conscience and private and public judgment is illustrated by contrasting the acts of conscience of Socrates and Thomas More with the rejection of private judgment against the state in Hobbes and Locke. (RM)
Practical Politics. Revised Edition.
ERIC Educational Resources Information Center
Ohio Dept. of State, Columbus.
The 12 lessons on practical politics have been designed to help high school classroom teachers in Ohio develop and implement educational programs on citizen participation and, specifically, on voting. Objectives are to familiarize students with Ohio voting and registration laws and procedures, to introduce them to voting equipment, to acquaint…
Salvi, Carola; Cristofori, Irene; Grafman, Jordan; Beeman, Mark
2016-01-01
Previous studies showed that liberals and conservatives differ in cognitive style. Liberals are more flexible, and tolerant of complexity and novelty, whereas conservatives are more rigid, are more resistant to change, and prefer clear answers. We administered a set of compound remote associate problems, a task extensively used to differentiate problem-solving styles (via insight or analysis). Using this task, several researches have proven that self-reports, which differentiate between insight and analytic problem-solving, are reliable and are associated with two different neural circuits. In our research we found that participants self-identifying with distinct political orientations demonstrated differences in problem-solving strategy. Liberals solved significantly more problems via insight instead of in a step-by-step analytic fashion. Our findings extend previous observations that self-identified political orientations reflect differences in cognitive styles. More specifically, we show that type of political orientation is associated with problem-solving strategy. The data converge with previous neurobehavioural and cognitive studies indicating a link between cognitive style and the psychological mechanisms that mediate political beliefs. PMID:26810954
ERIC Educational Resources Information Center
Forte, David F.
1984-01-01
Law is central to Islamic civilization. The classical law (the Shari'a) is the standard by which political action is measured. The history of the Shari'a and how it has influenced the world view and the cultural identity of Arab countries are examined. (RM)
ERIC Educational Resources Information Center
Educational Foundations, 1991
1991-01-01
This special theme issue of "Educational Foundations" contains five articles on the theme of "The Politics of Education." In Marie E. Wirsing's "Academic Freedom and Teaching Foundations of Education: A Personal Memoir," the history of academic freedom, including the constant struggles to preserve it and examples of significant infringement, are…
NASA Technical Reports Server (NTRS)
Vivent, Jacques
1922-01-01
In short, the "politics of aviation" lies in a few propositions: the need of having as large a number of fields as possible and of sufficient area; the utilization of the larger part of the existing military fields; the selection of uncultivated or unproductive fields, whenever technical conditions permit; ability to disregard (save in exceptional cases) objections of an agricultural nature.
Salvi, Carola; Cristofori, Irene; Grafman, Jordan; Beeman, Mark
2016-01-01
Previous studies showed that liberals and conservatives differ in cognitive style. Liberals are more flexible, and tolerant of complexity and novelty, whereas conservatives are more rigid, are more resistant to change, and prefer clear answers. We administered a set of compound remote associate problems, a task extensively used to differentiate problem-solving styles (via insight or analysis). Using this task, several researches have proven that self-reports, which differentiate between insight and analytic problem-solving, are reliable and are associated with two different neural circuits. In our research we found that participants self-identifying with distinct political orientations demonstrated differences in problem-solving strategy. Liberals solved significantly more problems via insight instead of in a step-by-step analytic fashion. Our findings extend previous observations that self-identified political orientations reflect differences in cognitive styles. More specifically, we show that type of political orientation is associated with problem-solving strategy. The data converge with previous neurobehavioural and cognitive studies indicating a link between cognitive style and the psychological mechanisms that mediate political beliefs. PMID:26810954
Imaging and Political Packaging.
ERIC Educational Resources Information Center
Leidman, Mary Beth
This document looks at advertising and political commercials in radio. When placing an advertisement, in any media in general and radio in particular, one takes into consideration qualitative and quantitative data: how many people are listening, and who they are, and what level of education they have attained. Listeners have extremely well…
ERIC Educational Resources Information Center
Schakel, Minnekus
This guide offers teachers and senior high school students the simple facts of how he can make a difference in the operation of the two-party system in the United States at the precinct level. It also attempts to show that students, teachers, the school curriculum, and our American political structure definitely need large numbers of high school…
Politics as Social History: Political Cartoons in the Gilded Age.
ERIC Educational Resources Information Center
Edwards, Rebecca
1999-01-01
Provides analyses of four political cartoons in order to suggest approaches to Gilded Age politics that reveal key issues, such as gender, religion, and ethnicity, as well as the struggles over material resources in a stratified economy. Maintains that political cartoons assist students in understanding the ideology of a past era. (CMK)
Practicing Politics: Female Political Scientists as Candidates for Elective Office
ERIC Educational Resources Information Center
Burrell, Barbara
2012-01-01
In 2007, University of Oklahoma political science professor Cindy Simon Rosenthal was elected mayor of Norman, Oklahoma, after having served as a member of its city council. Was her activity unique within the political science profession among female political scientists? Her election stimulated the curiosity of some of us in the…
Learning in Politics: Teachers' Political Experiences as a Pedagogical Resource
ERIC Educational Resources Information Center
Myers, John P.
2009-01-01
The suggestion that teaching is a political act has been a divisive issue among educators. However, there has been little analysis of the ways that teachers draw on their political experiences as pedagogical resources. Using a case study of seven teachers in Porto Alegre, Brazil who were involved in politics, this article explores the relationship…
Unexplored Dimensions of 'Political' in the Politics of Education Field.
ERIC Educational Resources Information Center
Kirst, Michael W.; Wirt, Fred
Recent analyses of the linkages between policy analysis and politics suggests that contemporary focus on the first had been poorly attenuated to the theoretical needs of the second. This paper specifies the kinds of research in educational politics that should ensue if the politics-of-education field is to become less oriented to specific policies…
Clean Air Now: Political Issues. Comparing Political Experiences, Experimental Edition.
ERIC Educational Resources Information Center
Gillespie, Judith A.; Lazarus, Stuart
The fourth unit to the second-semester "Comparing Political Experiences" course focuses on a specific, controversial, political issue. Using a documentary approach, this unit analyzes the concept of political change by examining the changes in Riverside, California, as that community confronts the issue of smog. The unit is divided into five…
Jobs and Engines: Political Issues. Comparing Political Experiences, Experimental Edition.
ERIC Educational Resources Information Center
Gillespie, Judith A.; Lazarus, Stuart
This is the fourth unit to the 12th-grade second-semester "Comparing Political Experiences" course which focuses on specific controversial political issues. The unit analyzes the concept of political development by examining the Cummins Engine Company and employee job security during the company's growth into a multinational corporation. Using the…
Evidence for charge-vortex duality at the LaAlO3/SrTiO3 interface.
Mehta, M M; Dikin, D A; Bark, C W; Ryu, S; Folkman, C M; Eom, C B; Chandrasekhar, V
2012-07-17
The concept of duality has proved extremely powerful in extending our understanding in many areas of physics. Charge-vortex duality has been proposed as a model to understand the superconductor to insulator transition in disordered thin films and Josephson junction arrays. In this model, on the superconducting side, one has delocalized Cooper pairs but localized vortices; while on the insulating side, one has localized Cooper pairs but mobile vortices. Here we show a new experimental manifestation of this duality in the electron gas that forms at the interface between LaAlO(3) and SrTiO(3). The effect is due to the motion of vortices generated by the magnetization dynamics of the ferromagnet that also forms at the same interface, which results in an increase in resistance on the superconducting side of the transition, but an increase in conductance on the insulating side.
Exact results in gauge-string dualities (Stockholm, Sweden, 23 January-17 February 2012)
NASA Astrophysics Data System (ADS)
Zarembo, Konstantin
2012-08-01
Exactly solvable models play a distinguished role in physics, as they help us understand the behavior of strongly correlated, strongly coupled systems in the regimes where other methods fail. For a long time, the exact solvability was associated with (1+1)-dimensional systems, where powerful methods of integrability allow one to find the exact spectrum, to study thermodynamics and to compute correlation functions for a number of strongly interacting field theories. The AdS/CFT duality established a rigorous relationship between gauge fields and strings, and paved the way for applying the methods of integrability in four-dimensional gauge theories. The two-dimensional dynamics on the string worldsheet (dual to the fluctuating electric flux tube in a gauge theory) is in many cases integrable, which opens the avenue for applications of non-perturbative, integrability-based methods to four-dimensional gauge theories. The progress in understanding non-perturbative phenomena in gauge theories has been rapid in recent years, and required synergy of methods from exactly solvable models, gauge theories, strings and integrable systems. The program 'Exact Results in Gauge-String Dualities' took place at Nordita, Stockholm from 23 January to 17 February 2012 and brought together specialists with common interests in string theory, quantum field theory and exactly solvable models. Topics discussed during the program included: (i) exact results in the AdS/CFT correspondence, (ii) scattering amplitudes, (iii) supersymmetric gauge theories, and (iv) Bethe ansatz and exact solvability in quantum field theory and statistical systems. The articles by D Sorokin [1] and M de Leeuw et al [2] give an overview of the string-theory origins of integrability in gauge theories, and of the algebraic structures omnipresent in quantum integrable systems. The topics covered in these articles underpin the integrability approach to gauge--string dualities and lie at the heart of the integrability
Applications of gauge duality in robust principal component analysis and semidefinite programming
NASA Astrophysics Data System (ADS)
Ma, ShiQian; Yang, JunFeng
2016-08-01
Gauge duality theory was originated by Freund [Math. Programming, 38(1):47-67, 1987] and was recently further investigated by Friedlander, Mac{\\^e}do and Pong [SIAM J. Optm., 24(4):1999-2022, 2014]. When solving some matrix optimization problems via gauge dual, one is usually able to avoid full matrix decompositions such as singular value and/or eigenvalue decompositions. In such an approach, a gauge dual problem is solved in the first stage, and then an optimal solution to the primal problem can be recovered from the dual optimal solution obtained in the first stage. Recently, this theory has been applied to a class of \\emph{semidefinite programming} (SDP) problems with promising numerical results [Friedlander and Mac{\\^e}do, SIAM J. Sci. Comp., to appear, 2016]. In this paper, we establish some theoretical results on applying the gauge duality theory to robust \\emph{principal component analysis} (PCA) and general SDP. For each problem, we present its gauge dual problem, characterize the optimality conditions for the primal-dual gauge pair, and validate a way to recover a primal optimal solution from a dual one. These results are extensions of [Friedlander and Mac{\\^e}do, SIAM J. Sci. Comp., to appear, 2016] from nuclear norm regularization to robust PCA and from a special class of SDP which requires the coefficient matrix in the linear objective to be positive definite to SDP problems without this restriction. Our results provide further understanding in the potential advantages and disadvantages of the gauge duality theory.
Applications of quark-hadron duality in F{sub 2} structure function.
Arrington, J.; Malace, S. P.; Adams, G. S.; Ahmidouch, A.; Angelescu, T.; Asaturyan, R.; Hafidi, K.; Holt, R. J.; Reimer, P. E.; Schulte, E.; Zheng, X.; Physics; Hampton Univ.; Univ. of South Carolina; Rensselaer Polytechnic Institute; North Carolina A&T State Univ.; Bucharest Univ.
2009-09-01
Inclusive electron-proton and electron-deuteron inelastic cross sections have been measured at Jefferson Lab (JLab) in the resonance region, at large Bjorken x, up to 0.92, and four-momentum transfer squared Q{sup 2} up to 7.5 GeV{sup 2} in the experiment E00-116. These measurements are used to extend to larger x and Q{sup 2} precision, quantitative, studies of the phenomenon of quark-hadron duality. Our analysis confirms, both globally and locally, the apparent 'violation' of quark-hadron duality previously observed at a Q{sup 2} of 3.5 GeV{sup 2} when resonance data are compared to structure function data created from CTEQ6M and MRST2004 parton distribution functions (PDFs). More importantly, our new data show that this discrepancy saturates by Q{sup 2}{approx}4 GeV{sup 2}, becoming Q{sup 2} independent. This suggests only small violations of Q{sup 2} evolution by contributions from the higher-twist terms in the resonance region that is confirmed by our comparisons to ALEKHIN and ALLM97. We conclude that the unconstrained strength of the CTEQ6M and MRST2004 PDFs at large x is the major source of the disagreement between data and these parametrizations in the kinematic regime we study and that, in view of quark-hadron duality, properly averaged resonance region data could be used in global quantum chromodynamics fits to reduce PDF uncertainties at large x.
Applications of quark-hadron duality in the F{sub 2} structure function
Malace, S. P.; Adams, G. S.; Villano, A. N.; Ahmidouch, A.; Danagoulian, S.; Angelescu, T.; Arrington, J.; Hafidi, K.; Holt, R. J.; Reimer, P. E.; Schulte, E.; Zheng, X.; Asaturyan, R.; Mkrtchyan, H.; Navasardyan, T.; Tadevosyan, V.; Baker, O. K.; Ent, R.; Keppel, C. E.; Tang, L.
2009-09-15
Inclusive electron-proton and electron-deuteron inelastic cross sections have been measured at Jefferson Lab (JLab) in the resonance region, at large Bjorken x, up to 0.92, and four-momentum transfer squared Q{sup 2} up to 7.5 GeV{sup 2} in the experiment E00-116. These measurements are used to extend to larger x and Q{sup 2} precision, quantitative, studies of the phenomenon of quark-hadron duality. Our analysis confirms, both globally and locally, the apparent 'violation' of quark-hadron duality previously observed at a Q{sup 2} of 3.5 GeV{sup 2} when resonance data are compared to structure function data created from CTEQ6M and MRST2004 parton distribution functions (PDFs). More importantly, our new data show that this discrepancy saturates by Q{sup 2}{approx}4 GeV{sup 2}, becoming Q{sup 2} independent. This suggests only small violations of Q{sup 2} evolution by contributions from the higher-twist terms in the resonance region that is confirmed by our comparisons to ALEKHIN and ALLM97. We conclude that the unconstrained strength of the CTEQ6M and MRST2004 PDFs at large x is the major source of the disagreement between data and these parametrizations in the kinematic regime we study and that, in view of quark-hadron duality, properly averaged resonance region data could be used in global quantum chromodynamics fits to reduce PDF uncertainties at large x.
Cultural Politics in the Classroom.
ERIC Educational Resources Information Center
Mackwood, Gae
1992-01-01
Discusses political correctness and cultural politics in the schools. Questions whether concern over education's traditionally Eurocentric view justifies rejecting the curriculum. Observes that the issue of how teachers teach also has cultural implications. Suggests that the political correctness debate shows how long the road to cross-cultural…
Political Correctness and Cultural Studies.
ERIC Educational Resources Information Center
Carey, James W.
1992-01-01
Discusses political correctness and cultural studies, dealing with cultural studies and the left, the conservative assault on cultural studies, and political correctness in the university. Describes some of the underlying changes in the university, largely unaddressed in the political correctness debate, that provide the deep structure to the…
The Nature of Organizational Politics.
ERIC Educational Resources Information Center
Newman, Belinda K.; Carpenter, D. Stanley
1993-01-01
Examines the role organizational politics play in student affairs. Sees background knowledge of politics as a concept critical to understanding idiosyncratic nature of any organization. Notes that both organizational conditions and individual behavior contribute to organization's political climate. Concludes that professionals who fail to…
Computing and the Political World.
ERIC Educational Resources Information Center
Danziger, James N.
1986-01-01
Presents a review of research on the influence of computing on government and politics. States that computing has increased information power, efficiency, and centralized control within the political world. Concludes that even though there is little current evidence that computing has revolutionized politics, the emerging impacts of advanced…
The Politics of Physical Education
ERIC Educational Resources Information Center
Claxton, David
2012-01-01
This paper, which was given as the Dudley Allen Sargent lecture at the 2012 conference of the National Association for Kinesiology and Physical Education in Higher Education, discusses the politics of physical education. It examines how both national politics and local/campus politics affect the discipline. Drawing from the history of national…
Two new tests to the distance duality relation with galaxy clusters
Santos-da-Costa, Simony; Busti, Vinicius C.; Holanda, Rodrigo F.L. E-mail: vcbusti@astro.iag.usp.br
2015-10-01
The cosmic distance duality relation is a milestone of cosmology involving the luminosity and angular diameter distances. Any departure of the relation points to new physics or systematic errors in the observations, therefore tests of the relation are extremely important to build a consistent cosmological framework. Here, two new tests are proposed based on galaxy clusters observations (angular diameter distance and gas mass fraction) and H(z) measurements. By applying Gaussian Processes, a non-parametric method, we are able to derive constraints on departures of the relation where no evidence of deviation is found in both methods, reinforcing the cosmological and astrophysical hypotheses adopted so far.
Ohm's law at strong coupling: S duality and the cyclotron resonance
Hartnoll, Sean A.; Herzog, Christopher P.
2007-11-15
We calculate the electrical and thermal conductivities and the thermoelectric coefficient of a class of strongly interacting 2+1-dimensional conformal field theories with anti-de Sitter space duals. We obtain these transport coefficients as a function of charge density, background magnetic field, temperature, and frequency. We show that the thermal conductivity and thermoelectric coefficient are determined by the electrical conductivity alone. At small frequency, in the hydrodynamic limit, we are able to provide a number of analytic formulas for the electrical conductivity. A dominant feature of the conductivity is the presence of a cyclotron pole. We show how bulk electromagnetic duality acts on the transport coefficients.
Quantum equivalence of σ models related by non-Abelian duality transformations
NASA Astrophysics Data System (ADS)
Balázs, L. K.; Balog, J.; Forgács, P.; Mohammedi, N.; Palla, L.; Schnittger, J.
1998-03-01
Coupling constant renormalization is investigated in two dimensional σ models related by non-Abelian duality transformations. In this respect it is shown that in the one loop order of perturbation theory the duals of a one parameter family of models, interpolating between the SU(2) principal model and the O(3) sigma model, exhibit the same behavior as the original models. For the O(3) model also the two loop equivalence is investigated, and is found to be broken just like in the already known example of the principal model.
Distance duality relation from x-ray and Sunyaev-Zel'dovich observations of clusters
Uzan, Jean-Philippe; Aghanim, Nabila; Mellier, Yannick
2004-10-15
X-ray and Sunyaev-Zel'dovich data of clusters of galaxies enable to construct a test of the distance duality relation between the angular and luminosity distances. We argue that such a test on large cluster samples maybe of importance, as a consistency check, while trying to distinguish between various models accounting for the acceleration of the universe. The analysis of a data set of 18 clusters shows no significant violation of this relation for a {lambda}-Cold Dark Matter (CDM) model. The origin and amplitude of systematic effects and the possibility to increase the precision of this method are discussed.
Ultrashort Optical Pulses in a Fermi Liquid and Duality of Gauge Gravitation
NASA Astrophysics Data System (ADS)
Konobeeva, N. N.; Belonenko, M. B.
2016-07-01
The problem of the propagation of ultrashort pulses, including both two-dimensional and three-dimensional pulses, in a Fermi liquid is considered with the help of representations of the duality of gauge gravitation. The electromagnetic field is considered classically on the basis of the Maxwell equations. The effective equation so obtained is analyzed numerically and the dynamics of the state of the electromagnetic field are elucidated in the planar case, and also when it is localized in two/three spatial dimensions.
Electromagnetic duality symmetry and helicity conservation for the macroscopic Maxwell's equations.
Fernandez-Corbaton, Ivan; Zambrana-Puyalto, Xavier; Tischler, Nora; Vidal, Xavier; Juan, Mathieu L; Molina-Terriza, Gabriel
2013-08-01
In this Letter, we show that the electromagnetic duality symmetry, broken in the microscopic Maxwell's equations by the presence of charges, can be restored for the macroscopic Maxwell's equations. The restoration of this symmetry is shown to be independent of the geometry of the problem. These results provide a tool for the study of light-matter interactions within the framework of symmetries and conservation laws. We illustrate its use by determining the helicity content of the natural modes of structures possessing spatial inversion symmetries and by elucidating the root causes for some surprising effects in the scattering off magnetic spheres. PMID:23971539
3d deconfinement, product gauge group, Seiberg-Witten and new 3d dualities
NASA Astrophysics Data System (ADS)
Nii, Keita
2016-08-01
We construct a three-dimensional deconfinement method which enables us to find new three-dimensional dualities and we apply various techniques developed in the fourdimensional supersymmetric gauge theories, such as product gauge groups and SeibergWitten curves, to the three-dimensional {N}=2 supersymmetric gauge theories. The dual descriptions of the three-dimensional {N}=2 supersymmetric gauge theories which involve two-index matters, for example, adjoint, symmetric, and anti-symmetric matters without a superpotential can be obtained. These matters are described in terms of the s-confining phases of the supersymmetric gauge theories.
Universality of the diffusion wake in the gauge-string duality
Gubser, Steven S.; Yarom, Amos
2008-03-15
As a particle moves through a fluid, it may generate a laminar wake behind it. In the gauge-string duality, we show that such a diffusion wake is created by a heavy quark moving through a thermal plasma and that it has a universal strength when compared to the total drag force exerted on the quark by the plasma. The universality extends over all asymptotically anti-de Sitter supergravity constructions with arbitrary scalar matter. We discuss how these results relate to the linearized hydrodynamic approximation and how they bear on our understanding of di-hadron correlators in heavy ion collisions.
Two pieces of folklore in the AdS/CFT duality
Maeda, Kengo; Natsuume, Makoto; Okamura, Takashi
2010-08-15
In the AdS/CFT duality, it is often said that a local symmetry in a bulk theory corresponds to a global symmetry in the corresponding boundary theory, but the global symmetry can become local when one couples with an external source. As a result, the Gubser-Klebanov-Polyakov-Witten relation gives a response function instead of a Green function. We explore this point in detail using the example of holographic superconductors. We point out that these points play a crucial role in interpreting the holographic London equation properly.
Two pieces of folklore in the AdS/CFT duality
NASA Astrophysics Data System (ADS)
Maeda, Kengo; Natsuume, Makoto; Okamura, Takashi
2010-08-01
In the AdS/CFT duality, it is often said that a local symmetry in a bulk theory corresponds to a global symmetry in the corresponding boundary theory, but the global symmetry can become local when one couples with an external source. As a result, the Gubser-Klebanov-Polyakov-Witten relation gives a response function instead of a Green function. We explore this point in detail using the example of holographic superconductors. We point out that these points play a crucial role in interpreting the holographic London equation properly.
Three-point functions in duality-invariant higher-derivative gravity
Naseer, Usman; Zwiebach, Barton
2016-03-21
Here, doubled α'-geometry is the simplest higher-derivative gravitational theory with exact global duality symmetry. We use the double metric formulation of this theory to compute on-shell three-point functions to all orders in α'. A simple pattern emerges when comparing with the analogous bosonic and heterotic three-point functions. As in these theories, the amplitudes factorize. The theory has no Gauss-Bonnet term, but contains a Riemann-cubed interaction to second order in α'.
Duality and genetic significance of REE speciation in tourmaline from tin deposits of the Far East
NASA Astrophysics Data System (ADS)
Gorelikova, N. V.; Balashov, F. V.; Bychkova, Ya. V.; Minervina, E. A.; Korostelev, P. G.; Magazina, O. L.; Bortnikov, N. S.
2016-04-01
The distribution of REEs and some minor elements in tourmalines of different associations and deposits of the Russian Far East is studied by the methods of ICP-MS, ICP-MS with laser ablation and scanning electron microscopy. The duality of REE speciation in tourmaline is established: in high-temperature varieties, most REEs (mainly HREEs) are incorporated in rare minerals (monazite, xenotime, zircon, and F-Ce-Y carbonate), whereas hydrothermal ores are characterized by isomorphic incorporation of LREEs in the mineral structure, as well as by a fine admixture of zircon at the expense of detrital clasts in flyschoid rocks with the zones of tourmalinization.
NASA Astrophysics Data System (ADS)
Gu, Yingfei; Lee, Ching Hua; Wen, Xueda; Cho, Gil Young; Ryu, Shinsei; Qi, Xiao-Liang
2016-09-01
In this paper, we study (2 +1 ) -dimensional quantum anomalous Hall states, i.e., band insulators with quantized Hall conductance, using exact holographic mapping. Exact holographic mapping is an approach to holographic duality which maps the quantum anomalous Hall state to a different state living in (3 +1 ) -dimensional hyperbolic space. By studying topological response properties and the entanglement spectrum, we demonstrate that the holographic dual theory of a quantum anomalous Hall state is a (3 +1 ) -dimensional topological insulator. The dual description enables a characterization of topological properties of a system by the quantum entanglement between degrees of freedom at different length scales.
Political involvement in nursing--politics, ethics, and strategic action.
Des Jardin, K
2001-11-01
Political apathy in the nursing profession can be attributed to numerous factors, including a perceived ethical conflict between professional values and political involvement, as well as a lack of strategy for political action. Differences in personal and professional ethics, conflicting loyalties, and a negative image of politics create ethical tension for nurses. Political-ethical conflicts can mean choosing between job, patient care, and personal ideals. Many nurses never have considered it their place to challenge the structure of the health care system or the rules guiding that system. Supporting political action that demands change in the system, therefore, can cause tension among nurses. The political-ethical dilemma for nurses is related to outdated images of nursing, repression, fear of power, and lack of knowledge. Many guidelines exist to help nurses understand why they should get involved in the political process. By using these guidelines, nurses can evaluate issues and use a valid method to assess problems, plan for action, and evaluate the effectiveness and benefits of specific strategies. In the second of this two-part series on political involvement in nursing, political-ethical conflict is explored, along with strategies for political action.
T-duality of α‧-correction to DBI action at all orders of gauge field
NASA Astrophysics Data System (ADS)
Garousi, Mohammad R.
2016-08-01
By explicit calculations of four-field couplings, we observe that the higher derivative corrections to the DBI action in flat space-time, can be either in a covariant form or in a T-duality invariant form. The two forms are related by a non-covariant field redefinition. Using this observation, we then propose a non-covariant but T-duality invariant action which includes all orders of massless fields and has two extra derivatives with respect to the DBI action.
Serenity in political uncertainty.
Doumit, Rita; Afifi, Rema A; Devon, Holli A
2015-01-01
College students are often faced with academic and personal stressors that threaten their well-being. Added to that may be political and environmental stressors such as acts of violence on the streets, interruptions in schooling, car bombings, targeted religious intimidations, financial hardship, and uncertainty of obtaining a job after graduation. Research on how college students adapt to the latter stressors is limited. The aims of this study were (1) to investigate the associations between stress, uncertainty, resilience, social support, withdrawal coping, and well-being for Lebanese youth during their first year of college and (2) to determine whether these variables predicted well-being. A sample of 293 first-year students enrolled in a private university in Lebanon completed a self-reported questionnaire in the classroom setting. The mean age of sample participants was 18.1 years, with nearly an equal percentage of males and females (53.2% vs 46.8%), who lived with their family (92.5%), and whose family reported high income levels (68.4%). Multiple regression analyses revealed that best determinants of well-being are resilience, uncertainty, social support, and gender that accounted for 54.1% of the variance. Despite living in an environment of frequent violence and political uncertainty, Lebanese youth in this study have a strong sense of well-being and are able to go on with their lives. This research adds to our understanding on how adolescents can adapt to stressors of frequent violence and political uncertainty. Further research is recommended to understand the mechanisms through which young people cope with political uncertainty and violence. PMID:25658930
Serenity in political uncertainty.
Doumit, Rita; Afifi, Rema A; Devon, Holli A
2015-01-01
College students are often faced with academic and personal stressors that threaten their well-being. Added to that may be political and environmental stressors such as acts of violence on the streets, interruptions in schooling, car bombings, targeted religious intimidations, financial hardship, and uncertainty of obtaining a job after graduation. Research on how college students adapt to the latter stressors is limited. The aims of this study were (1) to investigate the associations between stress, uncertainty, resilience, social support, withdrawal coping, and well-being for Lebanese youth during their first year of college and (2) to determine whether these variables predicted well-being. A sample of 293 first-year students enrolled in a private university in Lebanon completed a self-reported questionnaire in the classroom setting. The mean age of sample participants was 18.1 years, with nearly an equal percentage of males and females (53.2% vs 46.8%), who lived with their family (92.5%), and whose family reported high income levels (68.4%). Multiple regression analyses revealed that best determinants of well-being are resilience, uncertainty, social support, and gender that accounted for 54.1% of the variance. Despite living in an environment of frequent violence and political uncertainty, Lebanese youth in this study have a strong sense of well-being and are able to go on with their lives. This research adds to our understanding on how adolescents can adapt to stressors of frequent violence and political uncertainty. Further research is recommended to understand the mechanisms through which young people cope with political uncertainty and violence.
Sanders, T G
1987-01-01
Women are gradually gaining influence in Brazilian politics, especially since recent advances in the women's movement, but they still play a limited role. There have been journals devoted to feminism and some notable feminists since 1850. In 1932 suffragettes in Brazil gained women the right to vote. Women's associations burgeoned in the 1940s and 1950s, culminating in a peak in number of women in national elected positions in 1965. A repressive military regime reversed the process, which resumed in 1975. 1975 was also significant for the Brazilian women's movement because of the U.N. Women's Year. Several large, influential feminist political action groups were formed, typically by upper class women with leftist views, although some church and union groups from lower classes also appeared. In 1979-1981, the coherence of these groups fell into schism and fragmentation, because of disagreements over the feminist political doctrines and roles, views on legality of abortion, and special interest groups such as lesbians. Another bitter dispute is opposition by leftist women to BEMFAM, the Brazilian Society of Family Welfare, which provides family planning for the poor: leftists oppose BEMFAM because it is supported by funds from "imperialist" countries such as the U.S. There are several types of feminists groups: those that emphasize health, sexuality and violence; those composed of lesbians; those originating from lower classes and unions; publicly instituted organizations. Brazilian law forbids discrimination against women holding public office, but in reality very few women actually do hold office, except for mayors of small towns and a few administrators of the Education and Social Security ministries. Political office in Brazil is gained by clientism, and since women rarely hold powerful positions in business, they are outsiders of the system. Brazilian women have achieved much, considering the low female literacy rate and traditional power system, but their
Ditto, Peter H; Wojcik, Sean P; Chen, Eric Evan; Grady, Rebecca Hofstein; Ringel, Megan M
2015-01-01
Duarte et al. are right to worry about political bias in social psychology but they underestimate the ease of correcting it. Both liberals and conservatives show partisan bias that often worsens with cognitive sophistication. More non-liberals in social psychology is unlikely to speed our convergence upon the truth, although it may broaden the questions we ask and the data we collect. PMID:26786070
Sanders, T G
1987-01-01
Women are gradually gaining influence in Brazilian politics, especially since recent advances in the women's movement, but they still play a limited role. There have been journals devoted to feminism and some notable feminists since 1850. In 1932 suffragettes in Brazil gained women the right to vote. Women's associations burgeoned in the 1940s and 1950s, culminating in a peak in number of women in national elected positions in 1965. A repressive military regime reversed the process, which resumed in 1975. 1975 was also significant for the Brazilian women's movement because of the U.N. Women's Year. Several large, influential feminist political action groups were formed, typically by upper class women with leftist views, although some church and union groups from lower classes also appeared. In 1979-1981, the coherence of these groups fell into schism and fragmentation, because of disagreements over the feminist political doctrines and roles, views on legality of abortion, and special interest groups such as lesbians. Another bitter dispute is opposition by leftist women to BEMFAM, the Brazilian Society of Family Welfare, which provides family planning for the poor: leftists oppose BEMFAM because it is supported by funds from "imperialist" countries such as the U.S. There are several types of feminists groups: those that emphasize health, sexuality and violence; those composed of lesbians; those originating from lower classes and unions; publicly instituted organizations. Brazilian law forbids discrimination against women holding public office, but in reality very few women actually do hold office, except for mayors of small towns and a few administrators of the Education and Social Security ministries. Political office in Brazil is gained by clientism, and since women rarely hold powerful positions in business, they are outsiders of the system. Brazilian women have achieved much, considering the low female literacy rate and traditional power system, but their
Developing power and political skills.
Lussier, R N
1990-01-01
One characteristic of power is the ability to influence others; managers cannot be effective without it. Politics is the network of interactions by which power is acquired, transferred, and exercised; it is a fact of health-care life. Like the money in our economy, politics is the medium of exchange in an organization. Managers must be political beings to meet their objectives. This article helps you to assess your political behavior and describes specific methods to increase power and develop political skills. Using these techniques can result in getting what you want and having things done your way, resulting in better job performance and career advancement.
Rosoff, J I
1985-01-01
The legalization of abortion in the United States by the Supreme Court in 1973 bypassed the political process in the majority of the states. Since then, however, political controversy and agitation in relation to abortion has become nationwide. From largely Catholic-based opposition, it has grown to encompass religious fundamentalists and to be a major part of the New Right's agenda. Abortion is now, pro and con, part of the platform of both political parties. The sweeping nature of the Supreme Court's decisions leaves the opposition with very little room to restrict abortion, short of overturning the decisions through a constitutional amendment. Such an amendment requires a two-thirds majority of Congress and passage is unlikely. However, funding bans on scores of federal programmes have succeeded in restricting access to abortion for the poor, the young and minorities. These restrictions are part of a long-term strategy to educate the public as to the evils of abortion with the aim of making it illegal again, either through the adoption of a constitutional amendment or by obtaining a reversal by a hoped-for change in membership of the Supreme Court.
Playing politics fair and square.
Umiker, W
1990-07-01
Political action, like leadership behavior, may or may not be beneficial to the success of organizations and their personnel. At one end of the scale, political behavior is selfish. Some outliers are even unethical or illegal. In the upper registers, politically astute behavior supplements professional competency. It is beneficial not only to the practitioner, but also to his or her subordinates, superiors, peers, and employer. Negative political behavior is self-serving, manipulative, and violates the spirit of honest communication. It produces resentment and destroys morale. Often what is perceived as politics is merely poor communication. The remedy for this is better use of formal and informal channels of information. Incompetent employees often rationalize their failures by using politics as a scapegoat. To encourage positive political strategies, employers should institute training programs. Such programs should promote teamwork and teach positive interpersonal skills. Seminars on ethical decision making must be supplemented by model behavior on the part of upper managers.
Non-Abelian electric-magnetic duality with supersymmetry in 4D and 10D
NASA Astrophysics Data System (ADS)
Nishino, Hitoshi; Rajpoot, Subhash
2015-10-01
We present electric-magnetic (Hodge) duality formulation for non-Abelian gauge groups with N =1 supersymmetry in 3 +1 (4D) dimensions. Our system consists of three multiplets: (i) A super-Yang-Mills vector multiplet (YMVM) (Aμ I,λI) , (ii) a dual vector multiplet (DVM) (Bμ I,χI) , and (iii) an unphysical tensor multiplet (TM) (Cμν I,ρI,φI) , with the index I for adjoint representation. The multiplets YMVM and DVM are dual to each other like: Gμν I=(1 /2 )ɛμν ρ σFρσ I . The TM is unphysical, but still plays an important role for establishing the total consistency of the system, based on recently developed tensor-hierarchy formulation. We also apply this technique to non-Abelian electric-magnetic duality in 9 +1 (10D) dimensions. The extra bosonic auxiliary field Kμ1⋯μ6 in 10D is shown to play an important role for the closure of supersymmetry on fields.
NASA Astrophysics Data System (ADS)
Adam, C.; Sanchez-Guillen, J.; Wereszczynski, A.; Zakrzewski, W. J.
2013-01-01
The Bogomol’nyi-Prasad-Sommerfield (BPS) baby Skyrme models are submodels of baby Skyrme models, where the nonlinear sigma model term is suppressed. They have Skyrmion solutions saturating a BPS bound, and the corresponding static energy functional is invariant under area-preserving diffeomorphisms (APDs). Here we show that the solitons in the BPS baby Skyrme model, which carry a nontrivial topological charge Qb∈π2(S2) (a winding number), are dual to vortices in a BPS vortex model with a topological charge Qv∈π1(S1) (a vortex number), in the sense that there is a map between the BPS solutions of the two models. The corresponding energy densities of the BPS solutions of the two models are identical. A further consequence of the duality is that the dual BPS vortex models inherit the BPS property and the infinitely many symmetries (APDs) of the BPS baby Skyrme models. Finally, we demonstrate that the same topological duality continues to hold for the U(1) gauged versions of the models.
Virtual color-kinematics duality: 6-pt 1-loop MHV amplitudes
NASA Astrophysics Data System (ADS)
Yuan, Ellis Ye
2013-05-01
We study 1-loop MHV amplitudes in {N} = 4 super Yang-Mills theory and in {N} = 8 supergravity. For Yang-Mills we find that the simple form for the full amplitude presented by Del Duca, Dixon and Maltoni naturally leads to one that has physical residues on all compact contours. After expanding the simple form in terms of standard scalar integrals, we introduce redundancies under certain symmetry considerations to impose the color-kinematics duality of Bern, Carrasco and Johansson (BCJ). For five particles we directly find the results of Carrasco and Johansson as well as a new compact form for the supergravity amplitude. For six particles we find that all kinematic dual Jacobi identities are encapsulated in a single functional equation relating the expansion coefficients. By the BCJ double-copy construction we obtain a formula for the corresponding {N} = 8 super-gravity amplitude. Quite surprisingly, all physical information becomes independent of the expansion coefficients modulo the functional equation. In other words, there is no need to solve the functional equation at all. This is quite welcome as the functional equation we find, using our restricted set of redundancies, actually has no solutions. For this reason we call these results virtual color-kinematics duality. We end with speculations about the meaning of an interesting global vs. local feature of the functional equation and the situation at higher points.
On the Emergence of Syntactic Structures: Quantifying and Modeling Duality of Patterning.
Loreto, Vittorio; Gravino, Pietro; Servedio, Vito D P; Tria, Francesca
2016-04-01
The complex organization of syntax in hierarchical structures is one of the core design features of human language. Duality of patterning refers, for instance, to the organization of the meaningful elements in a language at two distinct levels: a combinatorial level, where meaningless forms are combined into meaningful forms; and a compositional level, where meaningful forms are composed into larger lexical units. The question remains wide open regarding how such structures could have emerged. The aim of this paper is to address these two aspects in a self-consistent way. First, we introduce suitable measures to quantify the level of combinatoriality and compositionality in a language, and we present a framework to estimate these observables in human natural languages. Second, we show that a recently introduced multi-agent modeling scheme, namely the Blending Game, provides a mathematical framework to address the problem of how a population of individuals can bootstrap combinatoriality and compositionality. Theoretical predictions based on this model turn out to be in good agreement with empirical data. It is remarkable that the two sides of duality of patterning emerge simultaneously as a consequence of a pure cultural dynamics in a simulated environment that contains meaningful relations, provided a simple constraint on message transmission fidelity is also considered. PMID:26969857
Duality and Stationary Distributions of the "Immediate Exchange Model" and Its Generalizations
NASA Astrophysics Data System (ADS)
van Ginkel, Bart; Redig, Frank; Sau, Federico
2016-04-01
We study the "Immediate Exchange Model", a wealth distribution model introduced in Heinsalu and Patriarca (Eur Phys J B 87:170, 2014). We prove that the model has a discrete dual, where the duality functions are natural polynomials associated to the Gamma distribution with shape parameter 2 and are exactly those connecting the Brownian Energy Process (with parameter 2) and the corresponding Symmetric Inclusion Process in Carinci et al. (J Stat Phys 152:657-697, 2013) and Giardinà et al. (J Stat Phys 135(1):25-55, 2009). As a consequence, we recover invariance of products of Gamma distributions with shape parameter 2, and obtain ergodicity results. Next we show similar properties for a more general model, where the exchange fraction is Beta(s, t) distributed, and product measures with text{ Gamma }(s+t) marginals are invariant. We also show that the discrete dual model itself is self-dual and has the original continuous model as its scaling limit. We show that the self-duality is linked with an underlying SU(1, 1) symmetry, reminiscent of the one found before for the Symmetric Inclusion Process and related processes.
Self-duality and self-similarity of little string orbifolds
NASA Astrophysics Data System (ADS)
Hohenegger, Stefan; Iqbal, Amer; Rey, Soo-Jong
2016-08-01
We study a class of N =(1 ,0 ) little string theories obtained from orbifolds of M-brane configurations. These are realized in two different ways that are dual to each other: either as M parallel M5-branes probing a transverse AN -1 singularity or N M5-branes probing an AM -1 singularity. These backgrounds can further be dualized into toric, noncompact Calabi-Yau threefolds XN ,M which have double elliptic fibrations and thus give a natural geometric description of T-duality of the little string theories. The little string partition functions are captured by the topological string partition function of XN ,M . We analyze in detail the free energies ΣN ,M associated with the latter in a special region in the Kähler moduli space of XN ,M and discover a remarkable property: in the Nekrasov-Shatashvili limit, ΣN ,M is identical to N M times Σ1 ,1. This entails that the Bogomol'nyi-Prasad-Sommerfield (BPS) degeneracies for any (N ,M ) can uniquely be reconstructed from the (N ,M )=(1 ,1 ) configuration, a property we refer to as self-similarity. Moreover, as Σ1 ,1 is known to display a number of recursive structures, BPS degeneracies of little string configurations for arbitrary (N ,M ) as well acquire additional symmetries. These symmetries suggest that in this special region the two little string theories described above are self-dual under T-duality.
An introduction to gauge-gravity duality and its application in condensed matter
NASA Astrophysics Data System (ADS)
Green, A. G.
2013-02-01
The past few years have witnessed a remarkable crossover of string theoretical ideas from the abstract world of geometrical forms to the concrete experimental realm of condensed matter physics. The basis for this - variously known as holography, the AdS/CFT correspondence or gauge-gravity duality - comes from notions right at the cutting edge of string theory. Nevertheless, the insights afforded can often be expressed in ways very familiar to condensed matter physicists. ? The aim of this short, introductory review is to survey the ideas underpinning this crossover, in a way that - as far as possible - strips them of sophisticated mathematical formalism, whilst at the same time retaining their fundamental essence. I will sketch the areas in which progress has been made to date and highlight where the challenges and open questions lie. Finally, I will attempt to give a perspective upon these ideas. What contribution can we realistically expect from this approach and how might it be accommodated into the canon of condensed matter theory? Inevitably, any attempt to do this in such a rapidly evolving field will be superseded by events. Nevertheless, I hope that this will provide a useful way to think about gauge-gravity duality and the uncharted directions in which it might take us.
Naming a Structured World: A Cultural Route to Duality of Patterning
Tria, Francesca; Galantucci, Bruno; Loreto, Vittorio
2012-01-01
The lexicons of human languages organize their units at two distinct levels. At a first combinatorial level, meaningless forms (typically referred to as phonemes) are combined into meaningful units (typically referred to as morphemes). Thanks to this, many morphemes can be obtained by relatively simple combinations of a small number of phonemes. At a second compositional level of the lexicon, morphemes are composed into larger lexical units, the meaning of which is related to the individual meanings of the composing morphemes. This duality of patterning is not a necessity for lexicons and the question remains wide open regarding how a population of individuals is able to bootstrap such a structure and the evolutionary advantages of its emergence. Here we address this question in the framework of a multi-agents model, where a population of individuals plays simple naming games in a conceptual environment modeled as a graph. We demonstrate that errors in communication as well as a blending repair strategy, which crucially exploits a shared conceptual representation of the environment, are sufficient conditions for the emergence of duality of patterning, that can thus be explained in a pure cultural way. Compositional lexicons turn out to be faster to lead to successful communication than purely combinatorial lexicons, suggesting that meaning played a crucial role in the evolution of language. PMID:22723839
Violation of quark-hadron duality and spectral chiral moments in QCD
Gonzalez-Alonso, Martin; Pich, Antonio; Prades, Joaquim
2010-04-01
We analyze the spectral moments of the V-A two-point correlation function. Using all known short-distance constraints and the most recent experimental data from tau decays, we determine the lowest spectral moments, trying to assess the uncertainties associated with the so-called violations of quark-hadron duality. We have generated a large number of acceptable spectral functions, satisfying all conditions, and have used them to extract the wanted hadronic parameters through a careful statistical analysis. We obtain accurate values for the {chi}PT couplings L{sub 10} and C{sub 87}, and a realistic determination of the dimension six and eight contributions in the operator product expansion, O{sub 6}=(-5.4{sub -1.6}{sup +3.6}){center_dot}10{sup -3} GeV{sup 6} and O{sub 8}=(-8.9{sub -7.4}{sup +12.6}){center_dot}10{sup -3} GeV{sup 8}, showing that the duality-violation effects have been underestimated in previous literature.
Functional-analysis based tool for testing quark-hadron duality
NASA Astrophysics Data System (ADS)
Caprini, Irinel; Golterman, Maarten; Peris, Santiago
2014-08-01
Quark-hadron duality is a key concept in QCD, allowing for the description of physical hadronic observables in terms of quark-gluon degrees of freedom. The modern theoretical framework for its implementation is Wilson's operator product expansion (OPE), supplemented by analytic extrapolation from large Euclidean momenta, where the OPE is defined, to the Minkowski axis, where observable quantities are defined. Recently, the importance of additional terms in the expansion of QCD correlators near the Minkowski axis, responsible for quark-hadron duality violations (DVs), was emphasized. In this paper we introduce a mathematical tool that might be useful for the study of DVs in QCD. It is based on finding the minimal distance, measured in the L∞ norm along a contour in the complex momentum plane, between a class of admissible functions containing the physical amplitude and the asymptotic expansion predicted by the OPE. This minimal distance is given by the norm of a Hankel matrix that can be calculated exactly, using as input the experimental spectral function on a finite interval of the timelike axis. We also comment on the relation between the new functional tool and the more commonly used χ2-based analysis. The approach is illustrated on a toy model for the QCD polarization function recently proposed in the literature.
Duality, quantum skyrmions, and the stability of a SO(3) two-dimensional quantum spin glass
NASA Astrophysics Data System (ADS)
da Conceição, C. M. S.; Marino, E. C.
2009-08-01
Quantum topological excitations (skyrmions) are analyzed from the point of view of their duality to spin excitations in the different phases of a disordered two-dimensional, short-range interacting, SO(3) quantum magnetic system of Heisenberg type. The phase diagram displays all the phases, which are allowed by the duality relation. We study the large-distance behavior of the two-point correlation function of quantum skyrmions in each of these phases and, out of this, extract information about the energy spectrum and nontriviality of these excitations. The skyrmion correlators present a power-law decay in the spin-glass (SG) phase, indicating that these quantum topological excitations are gapless but nontrivial in this phase. The SG phase is dual to the AF phase, in the sense that topological and spin excitations are, respectively, gapless in each of them. The Berezinskii-Kosterlitz-Thouless mechanism guarantees the survival of the SG phase at T≠0 , whereas the AF phase is washed out to T=0 by the quantum fluctuations. Our results suggest a more symmetric way of characterizing a SG phase: one for which both the order and disorder parameters vanish, namely, ⟨σ⟩=0 and ⟨μ⟩=0 , where σ is the spin and μ is the topological excitation operators.
Petersen, Michael Bang; Aarøe, Lene
2012-12-20
As evidenced by research in evolutionary psychology, humans have evolved sophisticated psychological mechanisms tailored to solve enduring adaptive problems of social life. Many of these social problems are political in nature and relate to the distribution of costs and benefits within and between groups. In that sense, evolutionary psychology suggests that humans are, by nature, political animals. By implication, a straightforward application of evolutionary psychology to the study of public opinion seems to entail that modern individuals find politics intrinsically interesting. Yet, as documented by more than fifty years of research in political science, people lack knowledge of basic features of the political process and the ability to form consistent political attitudes. By reviewing and integrating research in evolutionary psychology and public opinion, we describe (1) why modern mass politics often fail to activate evolved mechanisms and (2) the conditions in which these mechanisms are in fact triggered.
Personalizing politics: a congruency model of political preference.
Caprara, Gian Vittorio; Zimbardo, Philip G
2004-10-01
Modern politics become personalized as individual characteristics of voters and candidates assume greater importance in political discourse. Although personalities of candidates capture center stage and become the focus of voters' preferences, individual characteristics of voters, such as their traits and values, become decisive for political choice. The authors' findings reveal that people vote for candidates whose personality traits are in accordance with the ideology of their preferred political party. They also select politicians whose traits match their own traits. Moreover, voters' traits match their own values. The authors outline a congruency model of political preference that highlights the interacting congruencies among voters' self-reported traits and values, voters' perceptions of leaders' personalities, politicians' self-reported traits, and programs of favored political coalitions.
Berezhnoy, A. V.; Likhoded, A. K.
2008-02-15
On the basis of the assumption of quark-hadron duality, it is shown that the color-singlet contribution to the cross sections for the processes e + g {yields} e + J/{psi} + g and gg {yields} J/{psi}g increases upon taking into account the relative motion of quarks in the J/{psi} meson.
Berezhnoy, A. V. Likhoded, A. K.
2008-02-15
On the basis of the assumption of quark-hadron duality, it is shown that the color-singlet contribution to the cross sections for the processes e + g {sup {yields}} e + J/{psi} + g and gg {sup {yields}} J/{psi}g increases upon taking into account the relative motion of quarks in the J/{psi} meson.
Bambra, C; Fox, D; Scott‐Samuel, A
2007-01-01
This glossary reflects a (re‐)emerging awareness within public health of the political dimension of health and health inequalities, and it also attempts to define some of the key concepts from the political science literature in a way that will be of use in future public health analyses. Examples from different domains (healthcare and population health) are provided to highlight how political concepts pervade health. PMID:17568046
Scientists need political literacy
NASA Astrophysics Data System (ADS)
Simarski, Lynn Teo
Scientists need to sharpen their political literacy to promote public and congressional awareness of science policy issues. This was the message of a panel of politically savvy scientists at a recent workshop at the American Association for the Advancement of Science's annual meeting in Washington, D.C. Researchers can maximize their lobbying efforts by targeting critical points of the legislative and federal funding cycles, the panel said, and by understanding the differences between the science and policy processes.Drastic modifications to the federal budget process this year will influence how much funding flows to research and development. A new feature for FY 1991-1993 is caps on federal expenditure in three areas: defense, foreign aid, and domestic “discretionary” spending. (Most of the agencies that fund geophysics fall into the domestic category.) Money cannot now be transferred from one of these areas to another, said Michael L. Telson, analyst for the House Budget Committee, and loopholes will be “very tough to find.” What is more, non-defense discretionary spending has dropped over a decade from 24% of the budget to the present 15%. Another new requirement is the “pay-as-you-go” system. Under this, a bill that calls for an increase in “entitlement” or other mandatory spending must offset this by higher taxes or by a cut in other spending.
The political abuse of medicine.
Meyer-Lie, A
1987-01-01
The author considers the political abuse of medicine to include the suppression of the health professions through the intimidation of individuals and the control of professional organizations, as well as the active or passive participation of health professionals in punishment or torture of prisoners or political dissidents. He labels as indirect political abuse of medicine government policies which divert health resources and personnel from the health needs of the population. He supports actions to "build up a forceful worldwide public opinion against the political abuse of medicine" and suggests also the adoption of "internationally legally correct procedures binding on members of the world community."
The Politics of Endangered Species.
ERIC Educational Resources Information Center
Lipscomb, Fran
1982-01-01
Presents background information and teaching suggestions about endangered species for social studies teachers. Discusses political processes, economics, current events, and ethics. Lists resource information. (DC)
Political Science, Political Scientists, and the Baccalaureate Reform Movement.
ERIC Educational Resources Information Center
Colarulli, Guy C.; D'Lugin, Victor F.
This article reviews the Association of American Colleges' (AAC) report titled "Integrity in the College Curriculum: A Report to the Academic Community" in terms of its relevance to political science instruction at the undergraduate level. The report examines two issues: (1) political science as a core component of a general education curriculum;…
Political Correctness: Can It Ever Be Politically Incorrect?
ERIC Educational Resources Information Center
Trachtenberg, Stephen Joel
1993-01-01
"Politically correct" outlooks are to be neither wholly accepted nor wholly rejected; they are to be learned from. The self-scrutiny bred by concern about political correctness is an important part of the university tradition; and without it, colleges could not experience their current growing diversity. (MSE)
Political Disenchantment: A Cognitive-Perceptual Theory of Political Alienation.
ERIC Educational Resources Information Center
Long, Samuel
An investigation of a cognitive-perceptual model to measure adolescents' feelings of political alienation is reported. The model hypothesizes that fundamental to the political alienation process is a feared actual or potential loss of freedom; this process is called psychological reactance. The sample consisted of 460 senior high school students…
Personalizing Politics: A Congruency Model of Political Preference
ERIC Educational Resources Information Center
Caprara, Gian Vittorio; Zimbardo, Philip G.
2004-01-01
Modern politics become personalized as individual characteristics of voters and candidates assume greater importance in political discourse. Although personalities of candidates capture center stage and become the focus of voters' preferences, individual characteristics of voters, such as their traits and values, become decisive for political…
Millennials Talk Politics: A Study of College Student Political Engagement
ERIC Educational Resources Information Center
Kiesa, Abby; Orlowski, Alexander P.; Levine, Peter; Both, Deborah; Kirby, Emily Hoban; Lopez, Mark Hugo; Marcelo, Karlo Barrios
2007-01-01
In 1993, The Charles F. Kettering Foundation published "College Students Talk Politics," a national study conducted by the Harwood Group and based on focus groups on ten American campuses. The study found, among other things, that students considered politics "irrelevant" to their lives and saw little purpose in ever actively participating in the…
Political Socialization and Political Ideology as Sources of Educational Discontent
ERIC Educational Resources Information Center
Grove, John D.; And Others
1974-01-01
Political socialization and political ideology as sources of educational discontent are analyzed among a national sample of 1,811 academically successful, college-bound high school seniors. The findings indicate a substantial level of student dissatisfaction primarily caused by student alienation and formal curriculum. (Author/DE)
Busing in Boston: Political Issues. Comparing Political Experiences, Experimental Edition.
ERIC Educational Resources Information Center
Gillespie, Judith A.; Lazarus, Stuart
Unit two to the second-semester "Comparing Political Experiences" course focuses on a specific controversial political issue: court-ordered busing in Boston. A documentary approach represents the core of instruction in this 12th-grade unit. This approach avoids lengthy narratives of a theoretical approach and yet is more in-depth than the…
Youth, Life, and Politics: Examining the Everyday in Comparative Politics
ERIC Educational Resources Information Center
Ortuoste, Maria
2012-01-01
The traditional way of introducing comparative politics to freshmen, which is through the study of institutions, is contrasted with an alternative approach. An everyday-politics approach compares the daily struggles of global youth--how they cope in times of peace and war, and with issues of wealth and poverty, identity, education and employment,…
Mentoring Nurses in Political Skill to Navigate Organizational Politics
2016-01-01
Objective. The aim of this study was to describe and analyze the correlations between mentoring functions and political skill development among nurses who have earned or are candidates for a Ph.D. or doctorate of nursing practice (DNP) degree. Background. The healthcare system is in flux; future generations of Ph.D. and DNP nurse leaders will be required to demonstrate political acumen. Political skill to navigate organizational politics has had limited research within nursing. Methods. A cross-sectional research design using a web-based survey of 222 nurses who have earned or are candidates for a Ph.D. or DNP. This study utilized two validated tools to measure mentoring functions and political skill. Results. The response rate was 52% (n = 115) of which 86 were Ph.D. and 29 were DNPs. An informal mentoring relationship was described by 62% of the respondents and formal mentoring by 35% of the protégés; only 25% (n = 74) established a mentoring contract. Mentoring score showed significance for total political skill and moderate effect on the networking ability. The mentoring functions of advocacy, career development facilitation, learning facilitation, and friendship were found to correlate significantly with total political skill scores. Conclusions. This study established a benefit for nurses who have earned or are candidates for a Ph.D. or DNP from mentoring to support political skill development. PMID:27777798
Ni endohedral-doped C60 with duality of magnetic moments
NASA Astrophysics Data System (ADS)
Li, J. L.; Yang, G. W.
2010-06-01
We have performed the magnetic properties of Ni endohedral-doped C60 (Ni@C60) by the spin-polarized density functional calculations, and showed that there are three stable configurations depending on different sites of the doped Ni atoms. Due to the high hybridization and confinement effects, the magnetic moment of the Ni-encapsulated metallofullerenes has duality, i.e., altering between 2.02μB and zero, by positioning the Ni atom in the hollow cage of C60. These findings of the alternative magnetic moments of the Ni-encapsulated C60 implied that Ni@C60 could be expected to be promising as a single molecular magnetic switch.
SOME DUALITY THEOREMS FOR CYCLOTOMIC \\Gamma-EXTENSIONS OF ALGEBRAIC NUMBER FIELDS OF CM TYPE
NASA Astrophysics Data System (ADS)
Kuz'min, L. V.
1980-06-01
For an odd prime l and a cyclotomic \\Gamma{-}l-extension k_\\infty/k of a field k of CM type, a compact periodic \\Gamma-module A_l(k), analogous to the Tate module of a function field, is defined. The analog of the Weil scalar product is constructed on the module A_l(k). The properties of this scalar product are examined, and certain other duality relations are determined on A_l(k). It is proved that, in a finite l-extension k'/k of CM type, the \\mathbf{Z}_l-ranks of A_l(k) and A_l(k') are connected by a relation similar to the Hurwitz formula for the genus of a curve.Bibliography: 7 titles.
A new Tolman test of a cosmic distance duality relation at 21 cm.
Khedekar, Satej; Chakraborti, Sayan
2011-06-01
Under certain general conditions in an expanding universe, the luminosity distance (d(L)) and angular diameter distance (d(A)) are connected by the Etherington relation as d(L)=d(A)(1+z)2. The Tolman test suggests the use of objects of known surface brightness, to test this relation. In this Letter, we propose the use of a redshifted 21 cm signal from disk galaxies, where neutral hydrogen (HI) masses are seen to be almost linearly correlated with surface area, to conduct a new Tolman test. We construct simulated catalogs of galaxies, with the observed size-luminosity relation and realistic redshift evolution of HI mass functions, likely to be detected with the planned Square Kilometer Array. We demonstrate that these observations may soon provide the best implementation of the Tolman test to detect any violation of the cosmic distance duality relation.
Searching for systematics in SNIa and galaxy cluster data using the cosmic duality relation
Shafieloo, Arman; Majumdar, Subhabrata; Sahni, Varun; Starobinsky, Alexei A. E-mail: subha@tifr.res.in E-mail: alstar@landau.ac.ru
2013-04-01
We compare two different probes of the expansion history of the universe, namely, luminosity distances from type Ia supernovae and angular diameter distances from galaxy clusters, using the Bayesian interpretation of Crossing statistic [1,2] in conjunction with the assumption of cosmic duality relation. Our analysis is conducted independently of any a-priori assumptions about the nature of dark energy. The model independent method which we invoke searches for inconsistencies between SNIa and galaxy cluster data sets. If detected such an inconsistency would imply the presence of systematics in either of the two data sets. Simulating observations based on expected WFIRST supernovae data and X-ray eROSITA + SZ Planck cluster data, we show that our method allows one to detect systematics with high precision and without advancing any hypothesis about the nature of dark energy.
Roles of Asymptotic Condition and S-Matrix as Micro-Macro Duality in Qft
NASA Astrophysics Data System (ADS)
Ojima, Izumi
2010-01-01
Various versions of "independence" are actively inverstigated in quantum probability. In the context of relativistic QFT, we show here that the physical origin of "independence" can be sought in the asymptotic condition through which asymptotic fields and states exhibiting the independence emerge from the non-independent interacting Heisenberg fields in a kind of "central limit". From the algebraic viewpoint, this condition is equivalent to the on-shell condition to pick up free one-particle modes, which also reduces to Einstein's famous formula E = mc2. A scenario to reconstruct interacting Heisenberg fields as Micro-objects from these "independent" =free Macro-objects intertwined by an S-matrix as a measurable quantity is formulated according to the Micro-Macro Duality associated with a new notion of a cocycle of K-T operators.
Non-linear gauge transformations in D = 10 SYM theory and the BCJ duality
NASA Astrophysics Data System (ADS)
Lee, Seungjin; Mafra, Carlos R.; Schlotterer, Oliver
2016-03-01
Recent progress on scattering amplitudes in super Yang-Mills and super-string theory benefitted from the use of multiparticle superfields. They universally capture tree-level subdiagrams, and their generating series solve the non-linear equations of ten-dimensional super Yang-Mills. We provide simplified recursions for multiparticle superfields and relate them to earlier representations through non-linear gauge transformations of their generating series. Moreover, we discuss the gauge transformations which enforce their Lie symmetries as suggested by the Bern-Carrasco-Johansson duality between color and kine-matics. Another gauge transformation due to Harnad and Shnider is shown to streamline the theta-expansion of multiparticle superfields, bypassing the need to use their recursion relations beyond the lowest components. The findings of this work tremendously simplify the component extraction from kinematic factors in pure spinor superspace.
Color-kinematics duality in multi-Regge kinematics and dimensional reduction
NASA Astrophysics Data System (ADS)
Johansson, Henrik; Vera, Agustín Sabio; Campillo, Eduardo Serna; Vázquez-Mozo, Miguel Á.
2013-10-01
In this note we study the applicability of the color-kinematics duality to the scattering of two distinguishable scalar matter particles with gluon emission in QCD, or graviton emission in Einstein gravity. Previous analysis suggested that direct use of the Bern-Carrasco-Johansson double-copy prescription to matter amplitudes does not reproduce the gravitational amplitude in multi-Regge kinematics. This situation, however, can be avoided by extensions to the gauge theory, while maintaning the same Regge limit. Here we present two examples of these extensions: the introduction of a scalar contact interaction and the relaxation of the distinguishability of the scalars. In both cases new diagrams allow for a full reconstruction of the correct Regge limit on the gravitational side. Both modifications correspond to theories obtained by dimensional reduction from higher-dimensional gauge theories.
The case for duality violations in the analysis of hadronic τ decays
NASA Astrophysics Data System (ADS)
Peris, Santiago; Boito, Diogo; Golterman, Maarten; Maltman, Kim
2016-08-01
We discuss why, in the determination of $\\alpha_s(m_{\\tau}^2)$ from hadronic $\\tau$ decays, two important assumptions made in most of previous analyses, namely the neglect of higher-dimension condensates and of Duality Violations (DVs), have introduced uncontrolled systematic errors into this determination. Although the use of pinched weights is usually offered as a justification of these assumptions, we explain why it is not possible to simultaneously suppress these two contributions; particularly since the Operator Product Expansion is expected to be an asymptotic, rather than a convergent expansion. There is not only experimental and theoretical evidence for DVs, but they also affect the extraction of $\\alpha_s(m_{\\tau}^2)$.
The duality of health technology in chronic illness: how designers envision our future.
Lehoux, Pascale
2008-06-01
This essay critically explores the role of technological innovation in the constitution of chronic states and illness. Drawing on the co-construction of technology and society perspective, it focuses more specifically on the way in which innovation designers envisage the enhancement of the chronically ill and build certain kinds of socio-technical configuration to deal with chronic illness. Using the case of ;intelligent distance patient monitoring' as an illustration, the paper argues that technology creates as much as it solves the problem of chronic illness. Technology is recursively embedded in chronic illness and it generates dual effects: it constrains and sustains users' daily practices. Only by recognizing technology's duality and eventually transcending it will research and policy initiatives be able to deal creatively and responsibly with the design of our future health experiences.
Quark-hadron duality in the free neutron F2 structure function
Niculescu, Gabriel
2015-09-01
The Thomas Jefferson National Accelerator Facility (JLab) experiment BONuS used a novel spectator-tagging technique to measure the inclusive electron-free neutron scattering cross section and extract the F2 structure function. This data was used to reconstruct moments of F2 in the three prominent resonance region and the moments integrated over the entire resonance region. Comparisons of the experimental results with moments obtained from global parton distribution function parametrization seem to suggest that the quark-hadron duality hypothesis holds locally for the neutron in the second and third resonance regions down to Q^{2} of 1 GeV^{2}; with up to 20% violations observed in the first resonance region.
On inherited duality in Script N = 1 d = 4 supersymmetric gauge theories
NASA Astrophysics Data System (ADS)
Argyres, Philip C.; Intriligator, Ken; Leigh, Robert G.; Strassler, Matthew J.
2000-04-01
Four-dimensional Script N = 1 supersymmetric gauge theories with two adjoints and a quartic superpotential are believed, from AdS/CFT duality, to have SL(2,Bbb Z) invariance. In this note we review an old, unpublished argument for this property, based solely on field theory. The technique involves a complexified flavor rotation which deforms an Script N = 2 supersymmetric gauge theory with matter to an Script N = 1 theory, leaving all holomorphic invariants unchanged. We apply this to the Script N = 1 gauge theory with two massless adjoints and show that it has the same auxiliary torus as that of Script N = 4 gauge theory, from which SL(2,Bbb Z) invariance follows. In the appendix, we check that our arguments are consistent with earlier work on the SU(2) case. Our technique is general and applies to many other Script N = 1 theories.
GENERAL: Study on Duality of Wave and Particle of Turbulence Using CML Models
NASA Astrophysics Data System (ADS)
Liu, Zhao-Cu
2009-05-01
A family of coupled map lattice (CML) models has been developed to simulate the evolutional mechanism of interactions of convection, diffusion, and dispersion in both weakly and strongly coupled cases. Not only coherent and turbulent properties as well as their relations, but also the transitional states between convection dominating, diffusion dominating and dispersion dominating are analyzed to demonstrate the essential characteristics of any state. Numerical results show that the models are capable of simulating both layered coupling and stochastic mechanism, and lead us to understand whether or not turbulence coherent structure is formed by modulation of wave packet. The duality of wave and particle characters of turbulence is illustrated in the numerical simulation; a sketch picture is given to explain the questions associated with the turbulent inverse cascade, which is the result of the mutual interactions among the physical factors of nonlinearity, dissipation and dispersion.
The duality of professional practice in nursing: academics for the 21st century.
Andrew, Nicola; Robb, Yvonne
2011-07-01
Although pre-registration nursing in the United Kingdom (UK) is moving towards a graduate exit, the vocational/professional debate is still live and continues to be played out in both popular and professional literature. This study considers the nature of contemporary academic communities and the challenge of duality in professional nursing life. More than a decade after the move into higher education (HE) however the role of the academic is still controversial, with much of the debate focussed on the nature of clinical credibility. This article considers the dimensions of academic nursing, reports the views of academics and clinicians and introduces a model of working that could potentially harness and blend the skills of academics and clinicians, nurturing a culture of applied scholarship throughout the professional/academic journey. PMID:20934236
Giant adsorption of microswimmers: Duality of shape asymmetry and wall curvature
NASA Astrophysics Data System (ADS)
Wysocki, Adam; Elgeti, Jens; Gompper, Gerhard
2015-05-01
The effect of shape asymmetry of microswimmers on their adsorption capacity at confining channel walls is studied by a simple dumbbell model. For a shape polarity of a forward-swimming cone, like the stroke-averaged shape of a sperm, extremely long wall retention times are found, caused by a nonvanishing component of the propulsion force pointing steadily into the wall, which grows exponentially with the self-propulsion velocity and the shape asymmetry. A direct duality relation between shape asymmetry and wall curvature is proposed and verified. Our results are relevant for the design microswimmer with controlled wall-adhesion properties. In addition, we confirm that pressure in active systems is strongly sensitive to the details of the particle-wall interactions.
Pinched weights and duality violation in QCD sum rules: A critical analysis
Gonzalez-Alonso, Martin; Pich, Antonio; Prades, Joaquim
2010-07-01
We analyze the so-called pinched weights, that are generally thought to reduce the violation of quark-hadron duality in finite-energy sum rules. After showing how this is not true in general, we explain how to address this question for the left-right correlator and any particular pinched weight, taking advantage of our previous work [1], where the possible high-energy behavior of the left-right spectral function was studied. In particular, we show that the use of pinched weights allows to determine with high accuracy the dimension six and eight contributions in the operator-product expansion, O{sub 6}=(-4.3{sub -0.7}{sup +0.9})x10{sup -3} GeV{sup 6} and O{sub 8}=(-7.2{sub -5.3}{sup +4.2})x10{sup -3} GeV{sup 8}.
On the curious spectrum of duality invariant higher-derivative gravity
NASA Astrophysics Data System (ADS)
Hohm, Olaf; Naseer, Usman; Zwiebach, Barton
2016-08-01
We analyze the spectrum of the exactly duality and gauge invariant higher-derivative double field theory. While this theory is based on a chiral CFT and does not correspond to a standard string theory, our analysis illuminates a number of issues central in string theory. The full quadratic action is rewritten as a two-derivative theory with additional fields. This allows for a simple analysis of the spectrum, which contains two massive spin-2 ghosts and massive scalars, in addition to the massless fields. Moreover, in this formulation, the massless or tensionless limit α ' → ∞ is non-singular and leads to an enhanced gauge symmetry. We show that the massive modes can be integrated out exactly at the quadratic level, leading to an infinite series of higher-derivative corrections. Finally, we present a ghost-free massive extension of linearized double field theory, which employs a novel mass term for the dilaton and metric.
Scattering amplitude and bosonization duality in general Chern-Simons vector models
NASA Astrophysics Data System (ADS)
Yokoyama, Shuichi
2016-09-01
We present the exact large N calculus of four point functions in general Chern-Simons bosonic and fermionic vector models. Applying the LSZ formula to the four point function we determine the two body scattering amplitudes in these theories taking a special care for a non-analytic term to achieve unitarity in the singlet channel. We show that the S-matrix enjoys the bosonization duality, an unusual crossing relation and a non-relativistic reduction to Aharonov-Bohm scattering. We also argue that the S-matrix develops a pole in a certain range of coupling constants, which disappears in the range where the theory reduces to the Chern-Simons theory interacting with free fermions.
S-duality and the prepotential in N={2}^{star } theories (I): the ADE algebras
NASA Astrophysics Data System (ADS)
Billó, M.; Frau, M.; Fucito, F.; Lerda, A.; Morales, J. F.
2015-11-01
The prepotential of N={2}^{star } supersymmetric theories with unitary gauge groups in an Ω background satisfies a modular anomaly equation that can be recursively solved order by order in an expansion for small mass. By requiring that S-duality acts on the prepotential as a Fourier transform we generalise this result to N={2}^{star } theories with gauge algebras of the D and E type and show that their prepotentials can be written in terms of quasi-modular forms of SL(2, {Z}) . The results are checked against microscopic multi-instanton calculus based on localization for the A and D series and reproduce the known 1-instanton prepotential of the pure N=2 theories for any gauge group of ADE type. Our results can also be used to obtain the multi-instanton terms in the exceptional theories for which the microscopic instanton calculus and the ADHM construction are not available.
Putz, Mihai V.
2010-01-01
Within the path integral Feynman formulation of quantum mechanics, the fundamental Heisenberg Uncertainty Relationship (HUR) is analyzed in terms of the quantum fluctuation influence on coordinate and momentum estimations. While introducing specific particle and wave representations, as well as their ratio, in quantifying the wave-to-particle quantum information, the basic HUR is recovered in a close analytical manner for a large range of observable particle-wave Copenhagen duality, although with the dominant wave manifestation, while registering its progressive modification with the factor 1-n2, in terms of magnitude n∈[0,1]. of the quantum fluctuation, for the free quantum evolution around the exact wave-particle equivalence. The practical implications of the present particle-to-wave ratio as well as of the free-evolution quantum picture are discussed for experimental implementation, broken symmetry and the electronic localization function. PMID:21152325
Duality of a compact topological superconductor model and the Witten effect
NASA Astrophysics Data System (ADS)
Nogueira, Flavio S.; Nussinov, Zohar; van den Brink, Jeroen
2016-10-01
We consider a compact Abelian Higgs model in 3 +1 dimensions with a topological axion term and construct its dual theories for both bulk and boundary at strong coupling. The model may be viewed as describing a superconductor with magnetic monopoles, which can also be interpreted as a field theory of a topological Mott insulator. We show that this model is dual to a noncompact topological field theory of particles and vortices. It has exactly the same form as a model for superconducting cosmic strings with an axion term. We consider the duality of the boundary field theory at strong coupling and show that in this case θ is quantized as -8 π n /m , where n and m are the quantum numbers associated with electric and magnetic charges. These topological states lack a noninteracting equivalent.
Duality and the Knizhnik-Polyakov-Zamolodchikov relation in Liouville quantum gravity.
Duplantier, Bertrand; Sheffield, Scott
2009-04-17
We present a (mathematically rigorous) probabilistic and geometrical proof of the Knizhnik-Polyakov-Zamolodchikov relation between scaling exponents in a Euclidean planar domain D and in Liouville quantum gravity. It uses the properly regularized quantum area measure dmicro_{gamma}=epsilon;{gamma;{2}/2}e;{gammah_{epsilon}(z)}dz, where dz is the Lebesgue measure on D, gamma is a real parameter, 0
Open and closed string vertices for branes with magnetic field and T-duality
NASA Astrophysics Data System (ADS)
Pesando, Igor
2010-02-01
We discuss carefully the vertices which describe the dipole open strings and closed strings on a D-brane with magnetic flux on a torus. Translation invariance along closed cycles forces surprisingly closed string vertices written in open string formalism to acquire Chan-Paton like matrices. Moreover the one loop amplitudes have a single trace for the part of gauge group with the magnetic flux. These peculiarities are also required by consistency of the action of T-duality in the open string sector. In this way we can show to all orders in perturbation theory the equivalence of the T-dual open string theories, gravitational interactions included. We provide also a new and direct derivation of the bosonic boundary state in presence of constant magnetic and Kalb-Ramond background based on Sciuto-Della Selva-Saito vertex formalism.
Putz, Mihai V
2010-01-01
Within the path integral Feynman formulation of quantum mechanics, the fundamental Heisenberg Uncertainty Relationship (HUR) is analyzed in terms of the quantum fluctuation influence on coordinate and momentum estimations. While introducing specific particle and wave representations, as well as their ratio, in quantifying the wave-to-particle quantum information, the basic HUR is recovered in a close analytical manner for a large range of observable particle-wave Copenhagen duality, although with the dominant wave manifestation, while registering its progressive modification with the factor 1-n2, in terms of magnitude n∈[0,1]. of the quantum fluctuation, for the free quantum evolution around the exact wave-particle equivalence. The practical implications of the present particle-to-wave ratio as well as of the free-evolution quantum picture are discussed for experimental implementation, broken symmetry and the electronic localization function.
Political dynamics determined by interactions between political leaders and voters.
Bernard, Michael Lewis; Bier, Asmeret; Backus, George A.; Hills, Richard Guy
2010-03-01
The political dynamics associated with an election are typically a function of the interplay between political leaders and voters, as well as endogenous and exogenous factors that impact the perceptions and goals of the electorate. This paper describes an effort by Sandia National Laboratories to model the attitudes and behaviors of various political groups along with that population's primary influencers, such as government leaders. To accomplish this, Sandia National Laboratories is creating a hybrid system dynamics-cognitive model to simulate systems- and individual-level political dynamics in a hypothetical society. The model is based on well-established psychological theory, applied to both individuals and groups within the modeled society. Confidence management processes are being incorporated into the model design process to increase the utility of the tool and assess its performance. This project will enhance understanding of how political dynamics are determined in democratic society.
Revisiting the Distance Duality Relation using a non-parametric regression method
NASA Astrophysics Data System (ADS)
Rana, Akshay; Jain, Deepak; Mahajan, Shobhit; Mukherjee, Amitabha
2016-07-01
The interdependence of luminosity distance, DL and angular diameter distance, DA given by the distance duality relation (DDR) is very significant in observational cosmology. It is very closely tied with the temperature-redshift relation of Cosmic Microwave Background (CMB) radiation. Any deviation from η(z)≡ DL/DA (1+z)2 =1 indicates a possible emergence of new physics. Our aim in this work is to check the consistency of these relations using a non-parametric regression method namely, LOESS with SIMEX. This technique avoids dependency on the cosmological model and works with a minimal set of assumptions. Further, to analyze the efficiency of the methodology, we simulate a dataset of 020 points of η (z) data based on a phenomenological model η(z)= (1+z)epsilon. The error on the simulated data points is obtained by using the temperature of CMB radiation at various redshifts. For testing the distance duality relation, we use the JLA SNe Ia data for luminosity distances, while the angular diameter distances are obtained from radio galaxies datasets. Since the DDR is linked with CMB temperature-redshift relation, therefore we also use the CMB temperature data to reconstruct η (z). It is important to note that with CMB data, we are able to study the evolution of DDR upto a very high redshift z = 2.418. In this analysis, we find no evidence of deviation from η=1 within a 1σ region in the entire redshift range used in this analysis (0 < z <= 2.418).
Conformal blocks in Virasoro and W theories: Duality and the Calogero-Sutherland model
NASA Astrophysics Data System (ADS)
Estienne, Benoit; Pasquier, Vincent; Santachiara, Raoul; Serban, Didina
2012-07-01
We study the properties of the conformal blocks of the conformal field theories with Virasoro or W-extended symmetry. When the conformal blocks contain only second-order degenerate fields, the conformal blocks obey second order differential equations and they can be interpreted as ground-state wave functions of a trigonometric Calogero-Sutherland Hamiltonian with non-trivial braiding properties. A generalized duality property relates the two types of second order degenerate fields. By studying this duality we found that the excited states of the Calogero-Sutherland Hamiltonian are characterized by two partitions, or in the case of WA theories by k partitions. By extending the conformal field theories under consideration by a u(1) field, we find that we can put in correspondence the states in the Hilbert state of the extended CFT with the excited non-polynomial eigenstates of the Calogero-Sutherland Hamiltonian. When the action of the Calogero-Sutherland integrals of motion is translated on the Hilbert space, they become identical to the integrals of motion recently discovered by Alba, Fateev, Litvinov and Tarnopolsky in Liouville theory in the context of the AGT conjecture. Upon bosonization, these integrals of motion can be expressed as a sum of two, or in general k, bosonic Calogero-Sutherland Hamiltonian coupled by an interaction term with a triangular structure. For special values of the coupling constant, the conformal blocks can be expressed in terms of Jack polynomials with pairing properties, and they give electron wave functions for special Fractional Quantum Hall states.
TESTING THE DISTANCE-DUALITY RELATION WITH GALAXY CLUSTERS AND TYPE Ia SUPERNOVAE
Holanda, R. F. L.; Lima, J. A. S.; Ribeiro, M. B.
2010-10-20
In this Letter, we propose a new and model-independent cosmological test for the distance-duality (DD) relation, {eta} = D{sub L} (z)(1 + z){sup -2}/D{sub A} (z) = 1, where D{sub L} and D{sub A} are, respectively, the luminosity and angular diameter distances. For D{sub L} we consider two sub-samples of Type Ia supernovae (SNe Ia) taken from Constitution data whereas D{sub A} distances are provided by two samples of galaxy clusters compiled by De Filippis et al. and Bonamente et al. by combining Sunyaev-Zeldovich effect and X-ray surface brightness. The SNe Ia redshifts of each sub-sample were carefully chosen to coincide with the ones of the associated galaxy cluster sample ({Delta}z < 0.005), thereby allowing a direct test of the DD relation. Since for very low redshifts, D{sub A} (z) ape D{sub L} (z), we have tested the DD relation by assuming that {eta} is a function of the redshift parameterized by two different expressions: {eta}(z) = 1 + {eta}{sub 0} z and {eta}(z) = 1 + {eta}{sub 0} z/(1 + z), where {eta}{sub 0} is a constant parameter quantifying a possible departure from the strict validity of the reciprocity relation ({eta}{sub 0} = 0). In the best scenario (linear parameterization), we obtain {eta}{sub 0} = -0.28{sup +0.44} {sub -0.44} (2{sigma}, statistical + systematic errors) for the De Filippis et al. sample (elliptical geometry), a result only marginally compatible with the DD relation. However, for the Bonamente et al. sample (spherical geometry) the constraint is {eta}{sub 0} = -0.42{sup +0.34} {sub -0.34} (3{sigma}, statistical + systematic errors), which is clearly incompatible with the duality-distance relation.
4 CFR 7.3 - Political activities.
Code of Federal Regulations, 2013 CFR
2013-01-01
... none of the candidates is to be nominated or elected as representing a political party any of whose... identified with a political party, such as a constitutional amendment, referendum, approval of a municipal... a political party. (8) Political fund means any fund, organization, political action committee,...
4 CFR 7.3 - Political activities.
Code of Federal Regulations, 2012 CFR
2012-01-01
... none of the candidates is to be nominated or elected as representing a political party any of whose... identified with a political party, such as a constitutional amendment, referendum, approval of a municipal... a political party. (8) Political fund means any fund, organization, political action committee,...
4 CFR 7.3 - Political activities.
Code of Federal Regulations, 2014 CFR
2014-01-01
... none of the candidates is to be nominated or elected as representing a political party any of whose... identified with a political party, such as a constitutional amendment, referendum, approval of a municipal... a political party. (8) Political fund means any fund, organization, political action committee,...
4 CFR 7.3 - Political activities.
Code of Federal Regulations, 2011 CFR
2011-01-01
... none of the candidates is to be nominated or elected as representing a political party any of whose... identified with a political party, such as a constitutional amendment, referendum, approval of a municipal... a political party. (8) Political fund means any fund, organization, political action committee,...
9 CFR 354.25 - Political activity.
Code of Federal Regulations, 2010 CFR
2010-01-01
... 9 Animals and Animal Products 2 2010-01-01 2010-01-01 false Political activity. 354.25 Section 354... Political activity. All inspectors are forbidden, during the period of their respective appointments or licenses, to take an active part in political management or in political campaigns. Political activity...
50 CFR 260.88 - Political activity.
Code of Federal Regulations, 2012 CFR
2012-10-01
... 50 Wildlife and Fisheries 11 2012-10-01 2012-10-01 false Political activity. 260.88 Section 260.88... Products for Human Consumption Miscellaneous § 260.88 Political activity. All inspectors and licensed... part in political management or in political campaigns. Political activities in city, county, State,...
50 CFR 260.88 - Political activity.
Code of Federal Regulations, 2011 CFR
2011-10-01
... 50 Wildlife and Fisheries 9 2011-10-01 2011-10-01 false Political activity. 260.88 Section 260.88... Products for Human Consumption Miscellaneous § 260.88 Political activity. All inspectors and licensed... part in political management or in political campaigns. Political activities in city, county, State,...
9 CFR 592.80 - Political activity.
Code of Federal Regulations, 2014 CFR
2014-01-01
... 9 Animals and Animal Products 2 2014-01-01 2014-01-01 false Political activity. 592.80 Section 592... PRODUCTS INSPECTION VOLUNTARY INSPECTION OF EGG PRODUCTS Performance of Services § 592.80 Political..., to take an active part in political management or in political campaigns. Political activity in...
25 CFR 700.557 - Political activity.
Code of Federal Regulations, 2013 CFR
2013-04-01
... 25 Indians 2 2013-04-01 2013-04-01 false Political activity. 700.557 Section 700.557 Indians THE... Responsibility and Conduct § 700.557 Political activity. (a) Regulations on the political activity of Federal... active part in partisan political management or partisan political campaigns. (b) Special...
9 CFR 354.25 - Political activity.
Code of Federal Regulations, 2014 CFR
2014-01-01
... 9 Animals and Animal Products 2 2014-01-01 2014-01-01 false Political activity. 354.25 Section 354... Political activity. All inspectors are forbidden, during the period of their respective appointments or licenses, to take an active part in political management or in political campaigns. Political activity...
25 CFR 700.557 - Political activity.
Code of Federal Regulations, 2014 CFR
2014-04-01
... 25 Indians 2 2014-04-01 2014-04-01 false Political activity. 700.557 Section 700.557 Indians THE... Responsibility and Conduct § 700.557 Political activity. (a) Regulations on the political activity of Federal... active part in partisan political management or partisan political campaigns. (b) Special...
50 CFR 260.88 - Political activity.
Code of Federal Regulations, 2013 CFR
2013-10-01
... 50 Wildlife and Fisheries 11 2013-10-01 2013-10-01 false Political activity. 260.88 Section 260.88... Products for Human Consumption Miscellaneous § 260.88 Political activity. All inspectors and licensed... part in political management or in political campaigns. Political activities in city, county, State,...
9 CFR 592.80 - Political activity.
Code of Federal Regulations, 2011 CFR
2011-01-01
... 9 Animals and Animal Products 2 2011-01-01 2011-01-01 false Political activity. 592.80 Section 592... PRODUCTS INSPECTION VOLUNTARY INSPECTION OF EGG PRODUCTS Performance of Services § 592.80 Political..., to take an active part in political management or in political campaigns. Political activity in...
25 CFR 700.557 - Political activity.
Code of Federal Regulations, 2010 CFR
2010-04-01
... 25 Indians 2 2010-04-01 2010-04-01 false Political activity. 700.557 Section 700.557 Indians THE... Responsibility and Conduct § 700.557 Political activity. (a) Regulations on the political activity of Federal... active part in partisan political management or partisan political campaigns. (b) Special...
9 CFR 592.80 - Political activity.
Code of Federal Regulations, 2010 CFR
2010-01-01
... 9 Animals and Animal Products 2 2010-01-01 2010-01-01 false Political activity. 592.80 Section 592... PRODUCTS INSPECTION VOLUNTARY INSPECTION OF EGG PRODUCTS Performance of Services § 592.80 Political..., to take an active part in political management or in political campaigns. Political activity in...
Institutionalizing Political and Civic Engagement on Campus
ERIC Educational Resources Information Center
Hoffman, Adam H.
2015-01-01
In this quasi-experimental design, I examine the impact of a political engagement program on students, looking at traditional measures of internal efficacy, as well as other areas of political engagement including levels of political knowledge, the development of political skills, and interest in media coverage of politics.
25 CFR 700.557 - Political activity.
Code of Federal Regulations, 2011 CFR
2011-04-01
... 25 Indians 2 2011-04-01 2011-04-01 false Political activity. 700.557 Section 700.557 Indians THE... Responsibility and Conduct § 700.557 Political activity. (a) Regulations on the political activity of Federal... active part in partisan political management or partisan political campaigns. (b) Special...
25 CFR 700.557 - Political activity.
Code of Federal Regulations, 2012 CFR
2012-04-01
... 25 Indians 2 2012-04-01 2012-04-01 false Political activity. 700.557 Section 700.557 Indians THE... Responsibility and Conduct § 700.557 Political activity. (a) Regulations on the political activity of Federal... active part in partisan political management or partisan political campaigns. (b) Special...
9 CFR 354.25 - Political activity.
Code of Federal Regulations, 2011 CFR
2011-01-01
... 9 Animals and Animal Products 2 2011-01-01 2011-01-01 false Political activity. 354.25 Section 354... Political activity. All inspectors are forbidden, during the period of their respective appointments or licenses, to take an active part in political management or in political campaigns. Political activity...
50 CFR 260.88 - Political activity.
Code of Federal Regulations, 2014 CFR
2014-10-01
... 50 Wildlife and Fisheries 11 2014-10-01 2014-10-01 false Political activity. 260.88 Section 260.88... Products for Human Consumption Miscellaneous § 260.88 Political activity. All inspectors and licensed... part in political management or in political campaigns. Political activities in city, county, State,...
9 CFR 592.80 - Political activity.
Code of Federal Regulations, 2012 CFR
2012-01-01
... 9 Animals and Animal Products 2 2012-01-01 2012-01-01 false Political activity. 592.80 Section 592... PRODUCTS INSPECTION VOLUNTARY INSPECTION OF EGG PRODUCTS Performance of Services § 592.80 Political..., to take an active part in political management or in political campaigns. Political activity in...
7 CFR 52.55 - Political activity.
Code of Federal Regulations, 2012 CFR
2012-01-01
... 7 Agriculture 2 2012-01-01 2012-01-01 false Political activity. 52.55 Section 52.55 Agriculture... Regulations Governing Inspection and Certification Miscellaneous § 52.55 Political activity. All inspectors..., to take an active part in political management or in political campaigns. Political activities...
9 CFR 354.25 - Political activity.
Code of Federal Regulations, 2012 CFR
2012-01-01
... 9 Animals and Animal Products 2 2012-01-01 2012-01-01 false Political activity. 354.25 Section 354... Political activity. All inspectors are forbidden, during the period of their respective appointments or licenses, to take an active part in political management or in political campaigns. Political activity...
7 CFR 52.55 - Political activity.
Code of Federal Regulations, 2010 CFR
2010-01-01
... 7 Agriculture 2 2010-01-01 2010-01-01 false Political activity. 52.55 Section 52.55 Agriculture... Regulations Governing Inspection and Certification Miscellaneous § 52.55 Political activity. All inspectors..., to take an active part in political management or in political campaigns. Political activities...
7 CFR 52.55 - Political activity.
Code of Federal Regulations, 2011 CFR
2011-01-01
... 7 Agriculture 2 2011-01-01 2011-01-01 false Political activity. 52.55 Section 52.55 Agriculture... Regulations Governing Inspection and Certification Miscellaneous § 52.55 Political activity. All inspectors..., to take an active part in political management or in political campaigns. Political activities...
9 CFR 592.80 - Political activity.
Code of Federal Regulations, 2013 CFR
2013-01-01
... 9 Animals and Animal Products 2 2013-01-01 2013-01-01 false Political activity. 592.80 Section 592... PRODUCTS INSPECTION VOLUNTARY INSPECTION OF EGG PRODUCTS Performance of Services § 592.80 Political..., to take an active part in political management or in political campaigns. Political activity in...
9 CFR 354.25 - Political activity.
Code of Federal Regulations, 2013 CFR
2013-01-01
... 9 Animals and Animal Products 2 2013-01-01 2013-01-01 false Political activity. 354.25 Section 354... Political activity. All inspectors are forbidden, during the period of their respective appointments or licenses, to take an active part in political management or in political campaigns. Political activity...
50 CFR 260.88 - Political activity.
Code of Federal Regulations, 2010 CFR
2010-10-01
... 50 Wildlife and Fisheries 7 2010-10-01 2010-10-01 false Political activity. 260.88 Section 260.88... Products for Human Consumption Miscellaneous § 260.88 Political activity. All inspectors and licensed... part in political management or in political campaigns. Political activities in city, county, State,...
Technologist's political impotence
Pletta, D.H.
1986-01-01
Scientists and engineers have always improved living standards, but have also generated harmful side-effects which are becoming increasingly threatening. The author cites case histories which include (1) the overloading beyond safe design limits of highways and bridges, (2) the damage to forests and aquatic life from acid rain and irrigated-field runoff, and (3) the failure of certain engineering projects because of regulatory, legislative, or political failures and the lack of participation by scientists and engineers in decision making. Scientists and engineers would serve the public better if they would organize to pursue active leadership roles and if legislators were required to seek their participation and counsel. Scientists and engineers should bear ethical accountability for their professional activity. 9 references.
Rethinking political correctness.
Ely, Robin J; Meyerson, Debra E; Davidson, Martin N
2006-09-01
Legal and cultural changes over the past 40 years ushered unprecedented numbers of women and people of color into companies' professional ranks. Laws now protect these traditionally underrepresented groups from blatant forms of discrimination in hiring and promotion. Meanwhile, political correctness has reset the standards for civility and respect in people's day-to-day interactions. Despite this obvious progress, the authors' research has shown that political correctness is a double-edged sword. While it has helped many employees feel unlimited by their race, gender, or religion,the PC rule book can hinder people's ability to develop effective relationships across race, gender, and religious lines. Companies need to equip workers with skills--not rules--for building these relationships. The authors offer the following five principles for healthy resolution of the tensions that commonly arise over difference: Pause to short-circuit the emotion and reflect; connect with others, affirming the importance of relationships; question yourself to identify blind spots and discover what makes you defensive; get genuine support that helps you gain a broader perspective; and shift your mind-set from one that says, "You need to change," to one that asks, "What can I change?" When people treat their cultural differences--and related conflicts and tensions--as opportunities to gain a more accurate view of themselves, one another, and the situation, trust builds and relationships become stronger. Leaders should put aside the PC rule book and instead model and encourage risk taking in the service of building the organization's relational capacity. The benefits will reverberate through every dimension of the company's work.
Political Socialization in Elementary Schools.
ERIC Educational Resources Information Center
Palonsky, Stuart B.
1987-01-01
Argues that (1) understanding of the ways in which children think about the political aspects of their lives has been limited by functionalist views of schooling and positivist research paradigms; and (2) research should focus on ways children appropriate information from their experiences and use it to construct personal political realities.…
Hiroshima as Politics and History.
ERIC Educational Resources Information Center
Sherwin, Martin J.
1995-01-01
Argues that the objections raised to the Enola Gay exhibit are rooted in Cold War politics. Maintains that this historical myopia exemplifies the need for challenging historical inquiry. Characterizes opposition to the exhibit as largely political and discusses demands made to censor exhibit material. (MJP)
The politics of earthquake prediction
Olson, R.S.
1989-01-01
This book gives an account of the politics, scientific and public, generated from the Brady-Spence prediction of a massive earthquake to take place within several years in central Peru. Though the disaster did not happen, this examination of the events serves to highlight American scientific processes and the results of scientific interaction with the media and political bureaucracy.
Organizational Political Tactics in Universities
ERIC Educational Resources Information Center
Nejad, Bahareh Azizi; Abbaszadeh, Mir Mohammad Seiied; Hassani, Mohammad
2011-01-01
The present research aimed to promote understanding of political tactics in organizations. Political behavior in nowadays-complex conditions is a process that the conflicts, contrasts and differences among interested groups are resolved. It means dialogue, attention to different goals in organizations, regarding the interest of different groups,…
Teacher Political Disclosure as Parrhesia
ERIC Educational Resources Information Center
Journell, Wayne
2016-01-01
Background/Context: The traditional stance on teacher political disclosure within K-12 education is that neutrality is the only morally appropriate approach for teachers to take when broaching political or social issues in their classes due to their role as state employees who serve a particular community. A number of recent high-profile cases of…
ERIC Educational Resources Information Center
Ogden, Suzanne P.
1977-01-01
Presents concerns expressed by instructors teaching university courses on women in politics: course organization, interdepartmental communication between instructors of women's courses, field focus of course, question of role of sex in politics, instructor's pedagogical style, consciousness-raising, and methodological implications. (ND)
The Political Economy of Education.
ERIC Educational Resources Information Center
Carnoy, Martin
1985-01-01
The political economy of education treats education as a factor shaped by the power relations between different economic, political, and social groups. Specific topics discussed include the economic value of education, education as an allocator of economic roles, education and social class, education and income distribution, and education and…
ERIC Educational Resources Information Center
Wilkins, Lee
George Lucas's Star Wars trilogy is used as the basis for the creation of a political subtext arising from one of America's most enduring literary myths--the American Adam. That subtext, when translated into a modern political context, pinpoints two central issues to face this democracy in the coming years, as well as a national ambivalence about…
Assessing a Political Skills Curriculum.
ERIC Educational Resources Information Center
Jackson, Robert M.
This paper describes and evaluates a political skills course for college students. Course objectives include teaching students to do the following: organize and run a meeting; bargain effectively; communicate within and between groups; manage a crisis; organize a political coalition; be aware of personal stress and some of the ways to reduce it;…
Pumping Competition into Political Communication.
ERIC Educational Resources Information Center
Clarke, Peter; Evans, Susan H.
1986-01-01
States that the system of local political journalism has become fragile and that steps should be taken to remediate the situation, such as developing tax incentives that invite television news, distributed in nonbroadcast form, to enter the arena of local political information. (DF)
Libraries in the Political Scene.
ERIC Educational Resources Information Center
Dosa, Marta L.
An attempt is made to document some of the developments which affected the political role of German librarianship as seen through the involvements, activities, and correspondence of one of its leaders, George Leyh, during and after the Hitler era. The interconnections of Leyh's behavior, inner conflicts, and actions and the political and…
Hobbes, Liberalism, and Political Education.
ERIC Educational Resources Information Center
Esquith, Stephen L.
The connection between liberal political philosophy and political education is discussed with particular emphasis on the philosophy of Thomas Hobbes. The purpose of the essay is to explain how liberal citizens become committed to a distinctively liberal conception of the common good. Part 1 discusses Hobbes' theory that rationally determining…
The Politics of Latino Education
ERIC Educational Resources Information Center
Leal, David L., Ed.; Meier, Kenneth J., Ed.
2011-01-01
Education is one of the most important public policy issues facing Latinos in the United States today, but the political dynamics behind Latino school achievement and failure are often misunderstood--and at times, overlooked altogether. In twelve revealing essays, "The Politics of Latino Education" brings together 23 accomplished and influential…
Critical Thinking about Political Commentary.
ERIC Educational Resources Information Center
Luckowski, Jean A.; Lopach, James J.
2000-01-01
Argues that political commentary is excellent pedagogical raw material to help secondary students develop critical thinking. Outlines a lesson plan based on comparing the political commentaries of Rush Limbaugh and Will Rogers. Includes suggested evaluation activities, a list of annotated resources, and excerpts from the writings or statements of…
Political Geography and the Environment.
ERIC Educational Resources Information Center
Steinberg, Phillip E.
1997-01-01
Reviews recent theoretical advances in political geography, particularly those that stress the political conflict behind the production of space. Discusses how this has impacted the study of environmental phenomena such as hazards, human-land relationships, development, and international environmental governance. Suggests ways that political…
Press, Politics and Popular Government.
ERIC Educational Resources Information Center
Will, George F., Ed.
A panel discussion on politics and the press was held at the convention of the American Political Science Association in September 1971. This volume contains an essay delivered at that panel on the various functions or activities of the press--adversary, surrogate, sovereign--and remarks of the three discussants. In addition, an essay especially…