Bulletin of the American Physical Society
2008 APS April Meeting and HEDP/HEDLA Meeting
Volume 53, Number 5
Friday–Tuesday, April 11–15, 2008; St. Louis, Missouri
Session B7: The Quantum Nature of Gravitational Singularities |
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Sponsoring Units: GGR Chair: Lior Burko, University of Alabama, Huntsville Room: Hyatt Regency St. Louis Riverfront (formerly Adam's Mark Hotel), Rose Garden |
Saturday, April 12, 2008 10:45AM - 11:21AM |
B7.00001: The Nature of Classical Singularities Invited Speaker: Almost 40 years ago, Penrose and Hawking proved that, for reasonable matter, some type of singular behavior would arise if gravitational fields were to become sufficiently strong. The nature of the singular behavior was not specified and examples exhibiting a wide variety of pathologies are known. Shortly thereafter, Belinskii, Lifshitz, and Khalatnikov (BKL) conjectured that singularities arising from generic gravitational collapse would be spacelike and local (in the sense that spatial derivatives would not be dynamically important so that each spatial point would evolve as a separate universe). The status of our knowledge about singularities in classical general relativity, both at a rigorous mathematical level and through numerical simulations, will be reviewed. [Preview Abstract] |
Saturday, April 12, 2008 11:21AM - 11:57AM |
B7.00002: Singularity Resolution in Loop Quantum Gravity Invited Speaker: By now there are several examples in loop quantum gravity in which effects of quantum geometry became important, dominate the Planck regime and resolve classical singularities. The resulting quantum space-times are typically significantly larger than the original classical space-times. In simple examples, the physics of these quantum extensions has shed considerable light on issues such as the quantum nature of the big-bang and information loss puzzle. I will present a few examples to illustrate this growing area. [Preview Abstract] |
Saturday, April 12, 2008 11:57AM - 12:33PM |
B7.00003: Singularity resolution in string theory Invited Speaker: I will give an overview of what string theory can say about the singularities of general relativity. While we do not yet have a complete answer, progress has been made in two different directions. Even perturbatively, string theory resolves some singularities since strings sense spacetime differently than point particles. A nonperturbative formulation of string theory is provided by a gauge/gravity duality. This provides a way to map the problem of spacetime singularities into a problem in a nongravitational field theory. I will give examples of both approaches, and describe the remaining open problems. [Preview Abstract] |
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