Bulletin of the American Physical Society
APS April Meeting 2014
Volume 59, Number 5
Saturday–Tuesday, April 5–8, 2014; Savannah, Georgia
Session B11: Invited Session: Issues in Quantum Gravity |
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Sponsoring Units: GGR Chair: Jorge Pullin, Louisiana State University Room: Oglethorpe Auditorium |
Saturday, April 5, 2014 10:45AM - 11:21AM |
B11.00001: ABSTRACT MOVED TO K16.00007 |
Saturday, April 5, 2014 11:21AM - 11:57AM |
B11.00002: Quantum Space Time Engineering Invited Speaker: Bianca Dittrich Loop quantum gravity and spin foams offer a quantization of space time itself. We discuss how the choice of different kinematical vacua leads to different pictures of quantum space time. In particular we describe a recently introduced new vacuum and the associated representation of geometric observables. This (BF) vacuum is based on a topological phase and can be viewed as a condensate state arising from the more standard Ashtekar-Lewandowski vacuum. We argue that this new vacuum is a crucial step towards constructing a fully physical vacuum, leading to a description for the quantum dynamics of 4D space time. [Preview Abstract] |
Saturday, April 5, 2014 11:57AM - 12:33PM |
B11.00003: Singularity Resolution in Quantum Gravity Invited Speaker: Parampreet Singh In recent years, progress in understanding of the quantization of cosmological spacetimes using techniques of loop quantum gravity, has led to important insights on the resolution of singularities. With a rigorous loop quantization of isotropic and anisotropic spacetimes and development of sophisticated numerical techniques, it is now possible to explore in detail the structure of spacetime in the Planck regime and extract new physics of the very early universe. Investigations of quantization of various spacetimes indicates that classical singularities such as the big bang are avoided, and quantum evolution results in a bounce of the scale factor. The resolution of singularities seems to occur without any assumption on the initial state for quantum evolution or the equation of state of matter. In this talk, we will review some of the main developments in this direction and provide an up to date summary of the novel results obtained on the resolution of singularities in various models in loop quantum gravity. [Preview Abstract] |
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