Bulletin of the American Physical Society
APS April Meeting 2019
Volume 64, Number 3
Saturday–Tuesday, April 13–16, 2019; Denver, Colorado
Session B02: Quantum aspects of gravitationInvited
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Sponsoring Units: DGRAV Chair: Gary Horowitz, University of California Santa Barbara Room: Sheraton Plaza D |
Saturday, April 13, 2019 10:45AM - 11:21AM |
B02.00001: dS/dS and T\bar T Invited Speaker: Eva Silverstein Quantum gravity in realistic, cosmological spacetimes is well motivated by observations and the structure of stress-energy sources in string theory. We review and explain new developments in the uplift of the AdS/CFT duality to de Sitter spacetime, known as the dS/dS correspondence. The $T\bar T$ deformation of a conformal field theory has a dual description as a cutoff $AdS_3$ spacetime, at least at the level of pure 3d gravity. We generalize this deformation in such a way that it builds up a patch of bulk $dS_3$ spacetime instead. At each step along the trajectory in the space of $2d$ theories, the theory is deformed by a specific combination of $T\bar T$ and the two-dimensional cosmological constant. This provides a concrete holographic dual for the warped throat on the gravity side of the dS/dS duality, at leading order in large central charge. We also analyze a sequence of excitations of this throat on both sides of the duality, as well as the entanglement entropy. The talk will also describe work in progress joining the two warped throats, incorporating bulk matter, and assessing the generalization to higher dimensions. |
Saturday, April 13, 2019 11:21AM - 11:57AM |
B02.00002: Traversable wormholes Invited Speaker: Daniel L. Jafferis The prospect of traversable wormhole configurations has long been a source of fascination. I will describe the first examples that are consistent in a UV completable theory of gravity, involving no exotic matter. The configuration involves a direct connection between the two ends of the wormhole. I will also discuss its implications for quantum information in gravity, the black hole information paradox, and its relation to quantum teleportation. |
Saturday, April 13, 2019 11:57AM - 12:33PM |
B02.00003: Tabletop experiments for quantum gravity Invited Speaker: Daniel Carney Recent advances in cooling, control, and measurement of mechanical systems in the quantum regime have opened the possibility of the first direct observation of quantum gravity, at scales achievable in experiments. I'll give a broad overview of this idea, discussing a representative set of experiments and how they can be used to test various models of the gravitational field coupled to quantum matter. Particular attention will be paid to perturbatively quantized general relativity viewed as an effective field theory. |
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