... Abstracts for papers presented: Space, time and Life ... Descriptors : *ABSTRACTS, SIMULATION, MODELS, QUANTUM CHEMISTRY, MOLECULES ...

... Abstract : This is a largely tutorial lecture on the basic ideas of General Relativity - Einstein's theory of gravity as curved space-time - emphasizing ...

Following an overview of Minkowski's and Einstein's modifications of Newtonian physics, along with Lobachevskiy's and Riemann's modifications of Euclidean geometry, the General Theory of Relativity is outlined with emphasis on departures from classical co...

Transversality theory is used to study the curvature of generic space-times in general relativity and some applications to unique determination of the metric by the curvature are given.

... Title : Space-Time Filtering, Sampling and Motion Uncertainty. ... Abstract : The structure of filters which are ... time DOG as an energy filter, discusses its ...

Jun 22, 2005 ... Abstract: Space-Time Analysis of Regional Systems (STARS) is an open source package designed for the analysis of aerial data measured over ...

... Abstract : Space-time correlations of the longitudinal velocity fluctuations have been measured in a turbulent boundary layer, with and without ...

Conventional character of concepts of simultaneity and distance in the special relativity theory is discussed. The possibility is pointed out of introducing (within the mentioned convention) the anisotropic space-time that is characterized in general by a...

The topics discussed cover space--time physics, physics in flat space -- time, the mathematics of curved space --time, Einstein's geometric theory of gravity, relativistic stars, the universe, gravitational collapse and black holes, gravitational waves, experimental tests of ...

griebl@fmi.uni�passau.de ABSTRACT Automatic parallelization of loop programs based on space- time mapping. Space-time mapping gives us direct access to execution data such as (virtual) processor number results) to the (perfectly nested) space-time mapped program, as already mentioned. ...

A quantum relativity theory formulated in terms of Davis' quantum relativity principle is outlined. The first task in this theory as in classical relativity theory is to model space-time, the arena of natural processes. It is argued that the quantum space...

- fold, be it the Reimannian space time of General Relativity or the Minkowski space time of Relativistic general relativity, the four dimensional space time geometry, simply does not exist, except in a classical. [25] B.G. ...

. myuan@ou.edu, Telephone: 405-325-4293, Facsimile: 405-325-6090 Abstract This article consists of two. There are many research issues involved in the integration of GIS and KDD. Specifically, this article emphasizes, Tornadoes Space-time relation: (T ;S ,S ), Aggregates (Sub process)3 4 5 Process class: Hail Super process

... Abstract : The energy spectrum and spatial distribution of neutrons emitted by a plasma focus device was measured with nuclear emulsions and ...

... Pagination or Media Count : 35. Abstract : Radar clutter is usually characterized statistically by two parameter lognormal or Weibull models. ...

A couple of massless dipole ghost fields in two space-time dimensions is studied. The latter fields are related by the condition that the underlying zero norm fields, that are present in the equations of the Froissart model, are in fact a couple of dual s...

Classical electrodynamics is reconstructed in discrete space--time, then combined with Regge's discrete version of general relativity. Quantization using path integrals is considered briefly. (AIP)

Classical electrodynamics is reconstructed in discrete space-time, then combined with Regge's discrete version of general relativity. Quantization using path integrals is considered briefly. (ERA citation 01:026724)

Experiments designed to test Special Relativity are reviewed and their capabilities of distinguishing Special Relativity from Absolute Space-Time theories are analysed. Of two specific forms of Absolute theories proposed in recent years, it is shown that ...

AbstractSpace-Time Data Fusion (STDF) is a methodology for combing .... of the space-time interpolation problem, including data fusion. Each box in the ...

The evolution in curved space-time of quantum fields in theories with relatively flat potentials is considered. It is known that bubble nucleation, a quantum mechanical tunneling process, may occur in flat space-time even if V(?) has no barrier. It is shown that bubble nucleation can also occur in curved space-time ...

... This metric obviously reduces, in the Euclidean limit of constant coefficients, to the metric of Minkowski's space-time manifold of special relativity. ...

... and quantum effects occur as special cases. ... MATRIX THEORY, TENSOR ANALYSIS, RELATIVITY THEORY, ELECTRODYNAMICS, GRAVITY ...

... solar system. This is accomplished with the help of Einstein's general theory of relativity, which is briefly reviewed. It is found ...

Space-time correlations of the longitudinal velocity fluctuations have been measured in a turbulent boundary layer, with and without frequency filtering. Celerities, relative to various fluctuation scales, are defined as partial derivatives of the isocorr...

We show that in Minkowski space-time quantization of Dirac-Kahler spinors leads to abnormal anticommutation relations for half of the spinor modes. We discuss a possible remedy for the problem.

Nonlinear space-time transformations in the radial path integral are discussed. A transformation formula is derived, which relates the original path integral to the Green's function of a new quantum system with an effective potential containing an observa...

Quantum conformal fluctuations around a classical space-time geometry is investigated. A quantized version of Einstein's general relativity is used. The approach to quantum gravity is via path integrals. The root cause of the quantum fluctuation divergenc...

The general relativity theory considered as a gauge theory in a mathematical space-time (Heaven space) is quantized in terms of invariant dynamical variables and observable physical space-time (Sky space) constructed using the principles of quantum theory...

Subspace-Based Blind and Group-Blind Space-Time Multiuser Detection for the Generalized://www-mobile.ecs.soton.ac.uk Abstract--Subspace-based blind and group-blind space-time multiuser detection is invoked for a smart- ing channel, where the channel estimates are attained by using subspace- based blind techniques

A New Unitary Space-Time Code with High Diversity Product 1 Terasan Niyomsataya , Ali Miri@uottawa.ca Abstract In this paper, we propose new full diversity unitary space-time codes based on Hamiltonian of unity. We give some examples of proposed constellations, and also show that they outperform known design

Space-time neutronic behavior of CANDU reactors is of importance in the analysis and design of reactor safety systems. A methodology has been developed for simulating CANDU space-time neutronics with application to the analysis of postulated loss-of-coolant accidents. The approach involves the efficient use of a set of computer codes that provides a ...

The quaternion formalism is applied to special relativity and Riemannian space-time. Though quaternions introduce some difficulties in manipulation, they combine the advantages of spinor calculus and the matrix notations of Pauli and Dirac, in that field ...

A broad survey of the mathematics of general relativity theory is presented. Among the topics covered are Einstein field equations, cosmological models, black holes, space-times, and electromagnetism.(AIP)

... 14. ABSTRACT A MIMO-OFDM system for aircraft to urban ... techniques, namely spatial multiplexing, beamforming, space-time coding, and diversity ...

... Abstract : A MIMO-OFDM system for aircraft to urban ... MIMO techniques, namely spatial multiplexing, beamforming, space-time coding, and diversity ...

... Abstract : A space-time optimal power schedule for multiple distributed multiple-input multiple-output (MIMO) links without the knowledge of the ...

... Abstract : This research effort develops a space-time adaptive processing (STAP) radar data model for the side-looking (SL) array with platform ...

... ABSTRACT Future airborne radars will be required to detect targets in an interference background comprised of clutter and jamming. ... 2.5 Jamming ...

... DEVELOPMENT. Personal Author(s) : Swann,WFG. Report Date : MAR 1962. Pagination or Media Count : 241. Abstract : Contents ...

{rhood, gmat thew} @nas. nasa. gov. Abstract. In this work we describe the implementation of a practical mechanism for collecting and displaying ...

The theory of relativistic positioning systems and their natural associated emission coordinates are essential ingredients in the analysis of navigation systems and astrometry. Here we study emission coordinates in Minkowski space-time. For any choice of the four emitters (arbitrary space-time trajectories) the relation between the ...

Space, time, and causality provide a natural structure for organizing our experience. These abstract categories allow us to think relationally in the most basic sense; understanding simple events require one to represent the spatial relations among objects, the relative ...

We investigate the energy-momentum tensor for a massless conformally coupled scalar field in the region between two curved surfaces in k = -1 static Robertson-Walker space-time. We assume that the scalar field satisfies the Robin boundary condition on the surfaces. Robertson-Walker space-time space is conformally related to Rindler ...

A relation ''closer than'' is introduced for simple regions of curved space-time. This is a total relation on events within a light cone and a partial relation for events on a cone. The group of bijective automorphisms of the relation is the group of ...

Contents: Lectures on general relativity theory; Comparison of theory and observation in general relativity; Experimental tests of general relativity. radar; Gravitational waves; Measurements of space time curvature and search for gravitational radiation;...

The treatment of relativity theory includes the rise and fall of absolute space, Einsteinian kinematics and optics, space--time and four vectors, relativistic particle kinematics, relativity and electrodynamics, basic ideas of general relativity, and the formal development of general ...

The meaning of functions of the Riemannian coordinates and their relation to measurements are investigated. It is shown how symmetries of a Riemannian space-time describable by groups of motions may be given physical interpretation in terms of fiat space-time concepts. The linear first integrals of the differential equations ...

... be derived from the space- time locus of ... coding, and message prioritization relative to delay ... that utilize advanced MIMO and OFDM techniques and ...

Apr 7, 2006 ... The idea of acceleration and how it relates to gravity comes from Einstein's Equivalence Principle, which states that you cannot tell the ...

An invariant derived from the curvature of a Sp(2) fiber bundle over a Riemannian manifold reduces to the Dirac Lagrangian for flat space-time.

Equations relating crossed beam space-time correlations to the sound source strength per unit length

A theory of gravitation is developed which is a natural generalization of the Newtonian theory and of special relativity. Space-time is Riemannian, but its metric is determined by a scalar function phi, the analogue of the Newtonian potential. The functio...

A global connection on the Connes Marcolli renormalization bundle relates ?-functions of a class of regularization schemes by gauge transformations, as well as local solutions to ?-functions over curved space-time.

Quantum theory (QT) is usually formulated in terms of abstract mathematical postulates involving Hilbert spaces, state vectors and unitary operators. In this paper, we show that the full formalism of QT can instead be derived from five simple physical requirements, based on elementary assumptions regarding preparations, transformations and measurements. This is very similar to ...

A quantum relativity theory formulated in terms of Davis' quantum relativity principle is outlined. The first task in this theory as in classical relativity theory is to model space-time, the arena of natural processes. It is argued that the quantum space...

in the study of Einstein's General Theory of Relativity). These problems are, of course, all related to one solely in terms of the contributions they made to general relativity, as that theory is known in its of General Relativity', Hilbert stressed that the new conceptions of space, ...

By collecting both quantum and gravitational principles, a space time uncertainty relation (?t)???rlp2 is derived. It can be used to facilitate the discussion of several profound questions, such as computational capacity and thermodynamic properties of the universe and the origin of holographic dark energy. The universality and ...

The perspectives, information and conclusions conveyed in research project abstracts, progress reports, final reports, journal abstracts and journal publications convey the viewpoints of the principal investigator and may not represent the views and policies of ORD and EPA. Concl...

in the spacetime metric tensor, which propagate at the speed of light: ripples in the rigid fabric of spacetime #12;Spacetime and special relativity Henceforth space by itself, and time by itself, are doomed to fade away space time The Minkowski spacetime of special relativity is R4 . There is no preferred ...

In this paper we recall the construction of scalar field action on ?-Minkowski space-time and investigate its properties. In particular we show how the coproduct of ?-Poincar� algebra of symmetries arises from the analysis of the symmetries of the action, expressed in terms of Fourier transformed fields. We also derive the action on commuting space-time, ...

A new procedure for constructing electromagnetic and neutrino fields in curved space-times is formulated. The basic method consists of a covariant generalization of the Debye - or two-component Hertz - potential formalism of flat space. The formulation replaces the strongly coupled first-order Maxwell or Dirac system by a fully decoupled second-order differential equation. The ...

Twistorial formulation of a particle of arbitrary spin has been constructed. The twistor formulation is deduced from a space-time formulation of the spinning particle by introducing pure gauge Lorentz harmonics in this system. Canonical transformations and gauge fixing conditions, excluding space-time variables, produce the fundamental conditions of twistor transform ...

13. Endstates of stars: black holes 13.1 Space-time near a black hole Though not as well known exceeds that limit, nothing will stop its collapse, and it will eventually form a black hole. The properties of a black hole can be understood only in the context of General Relativity. General Relativity

The theory presented represents a different approach toward unification of the various branches of physics. The foundation of the theory rests upon generalizations of the classical laws of thermodynamics, particularly Caratheodory's abstract statement of the second law. These adopted laws are shown to produce, as special cases, current theories such as ...

314 IEEE COMMUNICATIONS LETTERS, VOL. 7, NO. 7, JULY 2003 BER Analysis of MPSK Space-Time Block Member, IEEE Abstract--Closed-form expressions of the bit error rate (BER) are derived for space channel, and the BER expres- sion is an approximation for high signal to noise ratio. Theoretical results

In this paper, we study the symmetries of massless and massive particles action. By considering the non-commutative space-time, we find appropriate non-commutative relation for relativistic particles which leaves invariant the non-commutative Minkowski space-time. We show that non-commutativity break the scale and conformal invariance ...

In this paper we classify Bianchi type VIII and IX space�times according to their teleparallel Killing vector fields in the teleparallel theory of gravitation by using a direct integration technique. It turns out that the dimensions of the teleparallel Killing vector fields are either 4 or 5. From the above study we have shown that the Killing vector fields for Bianchi type ...

We focus on the dynamical aspects on Newton-Hooke space-time NH{sub +} mainly from the viewpoint of geometric contraction of the de Sitter spacetime with Beltrami metric. (The term spacetime is used to denote a space with non-degenerate metric, while the term space-time is used to denote a space with degenerate metric.) We first discuss the Newton-Hooke ...

In loop quantum cosmology, Friedmann-LeMaitre-Robertson-Walker space-times arise as well-defined approximations to specific quantum geometries. We initiate the development of a quantum theory of test scalar fields on these quantum geometries. Emphasis is on the new conceptual ingredients required in the transition from classical space-time backgrounds to ...

The paper describes the structure and the use of a program written in the algebraic programming language REDUCE 2, giving the super-Hamiltonian and supermomenta constraints, as well as Hamilton's canonical equations in terms of the canonical variables, for vacuum relativistic space-times. The program uses as input the components of the spatial metric tensor and of the ...

Topics covered include: foundations of the general theory of relativity; classical tests of general relativity; curved space-time; stars and planets; pulsars; gravitational collapse and black holes; search for black holes; gravitational waves; cosmology; and cosmogony and the early universe. (GHT)

The chiral SU(3) quark model is shown to be a consequence of general relativity for Petrov type Id space-times, in much the same way that the Dirac equation is a consequence of special relativity. (auth)

Planar scalar field configurations in general relativity differ considerably from those in flat space. It is shown that static domain walls of finite thickness in curved space-time do not possess a reflection symmetry. At infinity, the space-time tends to...

The special theory of relativity (SR), developed by ALBERT EINSTEIN in 1905, represents a revolutionary change in the human conception of the nature of space and time. According to SR, space and time are not absolute but must be viewed as components of a single entity, SPACE-TIME. This idea has numerous important implications, both conceptual and ...

Higher order compact algorithms are developed for the numerical simulation of wave propagation by using the concept of a discrete dispersion relation. The dispersion relation is the imprint of any linear operator in space-time. The discrete dispersion rel...

As a result of generalization of special relativity theory to atomic structure of scales and watch according to Einstein indication space-time is established with two groups of isometries which assembly forms Poincare group. In such generalized Minchkowsk...

This is a largely tutorial lecture on the basic ideas of General Relativity - Einstein's theory of gravity as curved space-time - emphasizing the physical concepts and using only elementary mathematics. Per the slow motions and weak gravitational fields w...

lgonzalz@vxcern.cern.ch February 1997 SPACE, TIME AND SUPERLUMINAL PARTICLES L. GONZALEZ. It seems natural to assume that particles with critical speed in vacuum different from c are superluminal of superluminal particles, and of matter without a universal relativity principle, are discussed in view

A torsion-free world line is shown to correspond to a particle whose three-acceleration vector points in a fixed direction relative to its Fermi-transported local inertial rest frame. In flat space-time this is equivalent to the three-acceleration vector ...

A generalized notion of conformastat space-times is introduced in relativity theory. In this sense, the conformastat space-time is stationary with the three-space of time-like Killing trajectories being conformally flat. A 3+1 decomposition of the field e...

The algebra of matrices occurring in the finite-difference Dirac equation proposed by Meessen for a cubic space--time lattice is studied. It is found that no matrix representation exists for the algebra as originally given. A slightly weaker set of relations admits an essentially unique irreducible representation of dimension 16. (auth)

This volume features state-of-the-art research and talks by leading experts emphasizing on the currently developing areas of the theory. Some areas discussed are the structure of radiative space times, Robinson-Trautman solutions, space time geometry, canonical and causal structures. The role of wormholes in ...

The authors survey some known facts and open questions concerning the global properties of 3+1 dimensional space-times containing a compact Cauchy surface. The authors consider space-times with an l-dimensional Lie algebra of space-like Killing fields. Fo...

It is noted that the joint use of two basic differential identities in curved space-time, namely, 1) the Einstein-Hilbert identity (1915), and 2) the identity of P. Freud (1939), permits a viable alternative to general relativity and a resolution of the ``field stress-energy'' problem of the gravitational theory. (A tribute to Eugene P. Wigner's 1957 ...

In this essay, we argue that the emergence of classically connected space-times is intimately related to the quantum entanglement of degrees of freedom in a nonperturbative description of quantum gravity. Disentangling the degrees of freedom associated with two regions of space-time results in these regions pulling apart and pinching off from each other in ...

related to the research over the last few years in blind MIMO estimation, see for instance 15, 16Blind Space-time Receivers for CDMA Communications 1 David Gesbert Boon Chong Ngy Arogyaswami J applications with emphasis on blind signal detection. We begin with a motivation for the use of blind space

been proposed using cor- relation matching techniques [3]. Blind space-time RAKE receivers are designedBLIND ADAPTIVE MULTIUSER DETECTION FOR UPLINK LONG-CODE CDMA SYSTEMS Ping Liu and Zhengyuan Xu Dept. 2813-2822, November 2001. [4] J. Ramos, M. Zoltowski and H. Liu, "Low-complexity space-time processor

We discuss a differential equation, whose unknowns are a function and a Riemannian metric. This equation occurs both in general relativity (static space times) and in the study of the space of Riemannian metrics on a manifold (singularities of the map from the space of metrics into the space of functions, which assigns to any metric ...

In this Letter we discuss the possibility to define a space time with a DSR based approach. We show that the strategy of defining a non-linear realization of the Lorentz symmetry with a consistent vector composition law cannot be reconciled with the extra request of an invariant length (time) scale. The latter request forces to abandon the group structure ...

The de Sitter space-time appears to be the most widely chosen manifold to study quantum field theories on curved space-time. The reason is, of course, its high symmetry and the related fact that the mode functions can be obtained exactly in terms of known functions. Thus the different problems of quantization on curved ...

In this essay, we introduce a new approach to energy-momentum in general relativity. Space-time, as opposed to space, is recognized as the necessary arena for its examination, leading us to define new extended space-time energy and momentum constructs. From local and global considerations, we conclude that the Ricci tensor is the ...

For a certain example of a 'doubly special relativity theory' the modified space-time Lorentz transformations are obtained from the momentum space transformations by using canonical methods. In the sequel an energy-momentum dependent space-time metric is constructed, which is essentially invariant under the modified ...

Concepts of space and time are widely developed in physics. However, there is a considerable lack of biologically plausible theoretical frameworks that can demonstrate how space and time dimensions are implemented in the activity of the most complex life-system � the brain with a mind. Brain activity is organized both temporally and spatially, thus representing space-time in ...

Analyzing the development of the structure of space-time from the theory of Aristotle to the present day, the present work attempts to sketch a science of relativistic mechanics. The concept of relativity is discussed in relation to the way in which space-time splits up into space and time, and in relation to ...

ABSTRACT: In this paper we provide a review of selected mathematical ideas that can help us better understand the boundary between living and non-living systems. We focus on group theory and abstract algebra applied to molecular systems biology. Throughout this paper we briefly describe possible open problems. In connection with the genetic code we propose ...

The counterterms in the Lagrangian of a renormalizable quantum field theory that involve the Riemann curvature tensor are considered. It is proved that for six or fewer dimensions the counterterms not containing derivatives of the Riemann tensor are linearly independent. It is shown that there appears to be a maximum space-time dimension for which identities can exist among ...

A precise characterization of the high-frequency limit in general relativity (vacuum space-times) is presented. The averaging schemes used in earlier works are avoided by the use of weak limits, giving the characterization the advantage that the high-frequency limit can be rigorously analyzed. Using this characterization, a theorem to the effect that a ...

The paper summarizes, generalizes and reveals the physical content of a recently proposed framework that unifies the standard formalisms of special relativity and quantum mechanics. The framework is based on Hilbert spaces H of functions of four space-time variables x, t, furnished with an additional indefinite inner product invariant under Poincar� ...

In this paper we classify cylindrically symmetric static space-times according to their teleparallel homothetic vector fields using direct integration technique. It turns out that the dimensions of the teleparallel homothetic vector fields are 4, 5, 7 or 11, which are the same in numbers as in general relativity. In case of 4, 5 or 7 proper teleparallel ...

The evolution in flat and curved space-time of quantum fields in theories with relative flat potential and its consequences are considered. It is shown that bubble nucleation, a quantum mechanical tunnelling process, may occur in flat space-time, having a bounce solution, even if V(phi) has no barrier. It is shown that bubble ...

The two-dimensional topological field theory which describes a four-dimensional self-dual space-time (gravitational instanton) as a target space, which we constructed before, is shown to be deeply connected with Penrose's 'twistor theory'. The relations a...

The Joint Chiefs of Staff envision information superiority, attained through the conduct of Information Operations (I0), as key in obtaining full spectrum dominance in future conflicts. Computer Network Attack (CNA) and Defense (CND) are relatively new I0...

A space-time adaptive gridding technique for unsteady flows is presented. The technique is applied to the 2D unsteady Euler equations. The method is relatively simple, computationally very efficient and it can be easily adapted to other types of fluid flo...

In order to clarify the role of gravitation in forming a microcosmos and as a result of generalization of the principle of intertia relativity a three-dimensional space-time is obtained which posseses groups of isometries including Lorentz transformations...

Quantum mechanics of a neutral point-like particle in the general Riemannian space-time is constructed starting with the general Fock representation of the quantum scalar field. The known ambiguity of the representation is removed by the requirement that ...

A new analysis of global sea level has been made that avoids space/time bias of previous works. A coherent pattern of increasing relative sea level (RSL) was found to exist between 1903 to 1969. A similar analysis of the period 1930 to 1975 again showed R...

Critical analysis of the general theory of relativity (GTR) is briefly described. Acceptance of its conception is shown to lead to dropping a series of fundamental physical representations being the basis for physics. Firstly, it is giving up from the con...

May 3, 2011 ... NASA's Gravity Probe B (GP-B) mission has confirmed two key predictions derived from Albert Einstein's general theory of relativity, which the ...

The BRST invariance of theories with local space-time symmetries, such as the reparametrization-invariant point-particle or d-dimensional general relativity, and of theories with local internal symmetries, like abelian and non-abelian gauge theories, can ...

Supergravity, the particle theory which unifies under a unique gauge principle, the quantum-mechanical concept of spin and space-time geometry, is formulated in terms of quantities defined over Minkowski space-time. The relation between this formulation a...

The space-time structure of an exact dyon solution with the Tomimatsu-Sato-Yamazaki metric (ergosurfaces, event horizons, and ring singularities) is studied, and the relation between dyon black hole and thermodynamics is discussed. (Atomindex citation 14:...

An orthonormal tetrad system and associated coordinate system is obtained, which may be used to locally describe any dust-filled space-time. This is used to study dust-filled spaces in which there exist multiply transitive groups of motions; all such spac...

With the statistics of morphology of F-layer irregularities now in hand, it is possible to forecast in broad terms what to expect at equatorial, auroral, and polar latitudes during various levels of solar flux. With the beginning of an understanding of th...

The asymptotic symmetry group of General Relativity is the Bondi-Metzner-Sachs (BMS) group. We find the appropriate supergeneralization of this group for supergravity. The analysis is carried out using properties of the twistor equation and is valid for any space-time dimension.

From the work by Isham and Kuchar it is well known that in General Relativity space-time diffeomorphism algebra cannot be realized canonically without an additional structure. Here we show that the background Minkowski metric together with the covariant D...