Bulletin of the American Physical Society
2005 APS April Meeting
Saturday–Tuesday, April 16–19, 2005; Tampa, FL
Session Z9: New Ideas in Gravitation and Astrophysics |
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Sponsoring Units: DAP GGR Chair: Jorge Pullin, Louisiana State University Room: Marriott Tampa Waterside Room 5 |
Tuesday, April 19, 2005 3:30PM - 3:42PM |
Z9.00001: Energy distribution of Reissner-Nordstrom-anti-de Sitter black holes with negative or vanishing curvature Paul Halpern We use the Einstein energy-momentum complex to investigate the energy distributions of the generalized Reissner-Nordstrom family of spacetimes in 3+1 dimensions with asymptotically anti-de Sitter behavior. We replace the standard spherically-symmetric metric with two alternative geometries, each a solution of the Einstein-Maxwell equations with a negative cosmological constant. The first is a static ``black plane'' solution with vanishing two-dimensional curvature. The second possesses two-dimensional surfaces with constant negative curvature. We calculate the energy distributions of these models as functions of the mass, charge and cosmological constant. Comparing these expressions to those of the standard Reissner-Nordstrom-anti-de Sitter solution, we comment on the qualitative differences. [Preview Abstract] |
Tuesday, April 19, 2005 3:42PM - 3:54PM |
Z9.00002: Spin motion of a string Richard Hammond The equation of motion of a string is derived, and it is shown that deviations from the geodesic include a spin like character. In fact, it is shown that strings have spin and it is quantized. [Preview Abstract] |
Tuesday, April 19, 2005 3:54PM - 4:06PM |
Z9.00003: Gravity as Nonmetricity Alexander Poltorak It is shown that in the presence of an arbitrary affine connection, the gravitational field is described as nonmetricity of the affine connection. An affine connection can be interpreted as induced by a frame of reference (FR), in which the gravitational field is considered. This leads to an alternative geometrical interpretation of GR wherein gravity is a nonmetricity of space-time. Although the gravitational field equations are identical to Einstein's equations of GR, this formulation leads to a covariant tensor (instead of the pseudotensor) of energy-momentum of the gravitational field and covariant conservation laws. We further develop a geometric representation of FR as a metric-affine space ($L_{4}$,$g)$, with transition between FR represented as affine deformation of the connection. We show that the affine connection of a NIFR has curvature and may have torsion. We calculate the curvature for the uniformly accelerated FR. Finally, we show that GR is inadequate to describe gravitational field in a NIFR. We propose a generalization of GR, which describes gravity as nonmetricity of the affine connection induced in a FR. This generalization contains GR as a special case of the inertial FR. [Preview Abstract] |
Tuesday, April 19, 2005 4:06PM - 4:18PM |
Z9.00004: Extended Cellular Automata Models of Particles and Space-Time Michael Beedle Models of particles and space-time are explored through simulations and theoretical models that use Extended Cellular Automata models. The expanded Cellular Automata Models consist go beyond simple scalar binary cell-fields, into discrete multi-level group representations like S0(2), SU(2), SU(3), SPIN(3,1). The propagation and evolution of these expanded cellular automatas are then compared to quantum field theories based on the "harmonic paradigm" i.e. built by an infinite number of harmonic oscillators, and with gravitational models. [Preview Abstract] |
Tuesday, April 19, 2005 4:18PM - 4:30PM |
Z9.00005: Non-Local Gauge Field Theory: a Model Bojan Tunguz Some consequences of Non-Local Gauge (NLG) Invariance are explored with a NLG generalization of QED for which the Unitary group is generated by local functions and differential operators. One of the main features of the model is the existence of spin-two field with gravity-like interaction. Some of the most attractive features of this model are found when we try to quantize it. Most of the obstacles to covariant quantization that are found in General Relativity and other theories of gravity are avoided. This is due to the following features of the model: (1) unique dimensionless perturbation constant, (2) placement of the dimensionful Newton's constant into the gauge-field propagator, (3) polynomial form of the field self-interaction, and (4) the infinite number of local field functions. All these features render this model renormalizable. [Preview Abstract] |
Tuesday, April 19, 2005 4:30PM - 4:42PM |
Z9.00006: A massive graviton generalization of general relativity Chris Vuille The gauge bosons of Einstein's theory of general relativity are thought to be massless, with gravity waves propagating at the speed of light. It may turn out, however, that gravitons possess a very small mass. Developing a geometric theory of massive gravitons, therefore, may aid current researchers in gravity wave physics, who are currently mounting great efforts to observe these waves directly. One such theory, together with some basic solutions, is presented here. The theory is a generalization of Weyl's geometry, and could conceivably provide another avenue in the development of inflationary cosmologies. [Preview Abstract] |
Tuesday, April 19, 2005 4:42PM - 4:54PM |
Z9.00007: Precession of Mercury and Bending of Starlight Using Gravitational Emission Theory Gary Hunter, James Espinosa, Julie Talbot The precession of the perihelion of Mercury and the bending of starlight by the Sun are calculated exactly by modifying Newton's Theory of Gravitation. Assuming for gravity a propagation speed equal to that of light, we derive and solve an equation that includes the relative velocity between two objects. Analytical and numerical results are presented and the relevance to experiment is discussed. [Preview Abstract] |
Tuesday, April 19, 2005 4:54PM - 5:06PM |
Z9.00008: Gravity as a Grand Unification of Forces Rasulkhozha Sharafiddinov Any of all possible types of charges corresponds in nature to a kind of the inertial mass. Such a mass - charge duality of matter explains the coexistence of grand united rest mass and charge for the same neutrino equal respectively to its all the gravitational mass and charge which consist of the gravitoelectric, gravitoweak, gravitostrong and a range of others, innate components. From their point of view, a new grand unification theory has been created at the discussion of a question about unification of forces of a different nature. In this theory, the gravitational field must be naturally united gauge field of the unified system of the most diverse combinations of electromagnetic photons, weak bosons and strong gluons where the four pairs of forces of the micro world fundamental interactions are united. Some consequences and laboratory confirmations of the suggested theory have been listed which allow also to define the structure of the graviton as a grand united boson. Thereby it gives the possibility to directly look at the nature of the gravitational matter elucidating the interratio of intraneutrino forces and the problem of elementary particles chiral and mirror symmetries. [Preview Abstract] |
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