| Thursday 25 April 2024 | |
| Events for day: Thursday 16 April 2020 |
Unitarity From a Smooth Horizon? PHYSICS Under semiclassical evolution, black holes retain a smooth horizon but fail to return information. Yet, the Ryu-Takayanagi prescription computes the boundary entropy expected from unitary CFT evolution. We demonstrate this in a novel setting with an asymptotic bulk detector, eliminating an assumption about the entanglement wedge of auxiliary systems. We consider three interpretations of this result. (i) At face value, information is lost in the bulk but not in the CFT. This conflicts with the AdS/CFT dictionary. (ii) No unique QFT state (pure or mixed) governs all detector responses to the bulk Hawking radiation. This conflicts with the exist ... 11:00 - 12:00 IPM holography virtual seminar Unitarity From a Smooth Horizon? School PARTICLES AND ACCELERATORS Abstract: Under semiclassical evolution, black holes retain a smooth horizon but fail to return information. Yet, the Ryu-Takayanagi prescription computes the boundary entropy expected from unitary CFT evolution. We demonstrate this in a novel setting with an asymptotic bulk detector, eliminating an assumption about the entanglement wedge of auxiliary systems. We consider three interpretations of this result. (i) At face value, information is lost in the bulk but not in the CFT. This conflicts with the AdS/CFT dictionary. (ii) No unique QFT state (pure or mixed) governs all detector responses to the bulk Hawking radiation. This conflicts with ... 11:00 - 12:00 Weekly Webinar Mathematical models prescribe: Staying at home is the key to control the spread of COVID-19 School BIOLOGICAL SCIENCES ... |