Bulletin of the American Physical Society
2006 APS April Meeting
Saturday–Tuesday, April 22–25, 2006; Dallas, TX
Session B11: Focus Session: Recent Results in Quantum Gravity |
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Sponsoring Units: GGR Chair: William Hiscock, Montana State University Room: Hyatt Regency Dallas Cumberland E |
Saturday, April 22, 2006 10:45AM - 11:21AM |
B11.00001: Emergence of the standard model from quantum gravity Invited Speaker: Recent developments in loop quantum gravity (LQG) are presented which have implications for experiment. First a review is given of the basic ideas and principles which underlie loop quantum gravity which is a non-perturbative approach to unifying gravity and relativity with quantum theory. The main results are then reviewed, with emphasis on those that establish the finiteness of the theory and the discreteness of quantum geometry. A brief survey is then given of recent applications to black holes, the very early universe and high energy astrophys experiments such as AUGER and GLAST. The last part of the talk will then introduce recent results which show that, given certain assumptions, the low energy excitations of the quantum gravity theory have fermionic states which coincide with the fermions of the standard model. [Preview Abstract] |
Saturday, April 22, 2006 11:21AM - 11:33AM |
B11.00002: Black hole peregrinations Eanna Flanagan We consider the evaporation of a black hole of initial mass $M_i$, as monitored by observers who measure its position, mass, and momentum from its asymptotic gravitational field at a distance of order $\sim M_i^2$ in Planck units. As the black hole evaporates, each quanta of Hawking radiation will carry away some spatial momentum and will cause a slight recoil of the black hole. The net effect of this is a spreading of the black hole's wavefunction, first analyzed by Don Page in 1980. There are corresponding fluctuations in the asymptotically measured mass. We argue based on simple models that at the end of the evaporation process the black hole is spread out over a region of size $\sim M_i^2$ in both space and time. This effect complicates the usual sharp arguments for the information loss paradox, and seems to lead to a slight easing of the paradox. [Preview Abstract] |
Saturday, April 22, 2006 11:33AM - 11:45AM |
B11.00003: Holography and entropy bounds in the plane wave matrix model Aleksey Mints, Raphael Bousso As a quantum theory of gravity, Matrix theory should provide a realization of the holographic principle, in the sense that a holographic theory should contain one binary degree of freedom per Planck area. We present evidence that Bekenstein's entropy bound, which is related to area differences, is manifest in the plane wave matrix model. If holography is implemented in this way, we predict crossover behavior at strong coupling when the energy exceeds N**2 in units of the mass scale. [Preview Abstract] |
Saturday, April 22, 2006 11:45AM - 11:57AM |
B11.00004: Consistent discretization of classical and quantum Regge Calculus Jorge Pullin, Rodolfo Gambini We apply the ``consistent discretization'' approach to Regge Calculus. As a consequence, one can construct a consistent well defined canonical theory for it. This would, in particular, allow the introduction of a natural measure in the path integral quite different from the usual ones. We apply the technique to a concrete example in 2+1 dimensional gravity. [Preview Abstract] |
Saturday, April 22, 2006 11:57AM - 12:09PM |
B11.00005: Horizon Constraints and Stringy Black Holes Steven Carlip To ask a question about a black hole in quantum gravity, one must constrain initial or boundary data to ensure that a suitable black hole is actually present. In a canonical formalism, such a new constraint can alter the algebra of diffeomorphisms, leading to the appearance of ``Goldstone boson-like'' physical degrees of freedom. I show that this modified algebra can be matched to known properties of a large class of string theoretical black holes, allowing a simple picture of their thermodynamics. [Preview Abstract] |
Saturday, April 22, 2006 12:09PM - 12:21PM |
B11.00006: Loop quantum cosmology in the Schwarzschild interior Daniel Cartin, Gaurav Khanna In this work, we solve the discrete Hamiltonian constraint for the interior of the Schwarzschild black hole, recently derived by Ashtekar and Bojowald. Both analytic results and numerical simulations are presented here, characterizing the range of wave function solutions and putting a limitation on the quantum ambiguities appearing in the problem. [Preview Abstract] |
Saturday, April 22, 2006 12:21PM - 12:33PM |
B11.00007: Non-singular cosmological dynamics in Bianchi models of Loop Quantum Cosmology Kevin Vandersloot Loop quantum cosmolgy predicts modifications to the standard Friedmann dynamics of cosmological models in the high energy regime. We show the ramefications of this in the Bianchi I and IX models and how it resolves the classical Big-Bang singularity and replaces it with a bounce for generic forms of matter. [Preview Abstract] |
Saturday, April 22, 2006 12:33PM - 12:45PM |
B11.00008: Introducing a Unifying Theory of Relativity and Quantum Mechanics N. Glenn Gratke The essence of this proposition of Unified Quantum Relativity lies in the realization that the energy of rest-rest quanta vary due to motion and gravity and that this variation produces the effects of Relativity. This talk will reinterpret gravitational redshift as a basis for assessing the variation of quanta due to gravity. [Preview Abstract] |
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