[Seminars] FW: [physcolloqadmin] Physics Colloquium Thursday April 1, 2021 at 3:30pm CDT with Ahmed Almheiri

[Ramona Echols]

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New surprises from the gravitational path integral

 [A person with a beard  Description automatically generated with medium confidence]





Ahmed Almheiri

Institute of Advanced Study



3:30pm CDT, Thursday, April 1, 2021

ZOOM Link:
<https://urldefense.com/v3/__https:/uchicagogroup.zoom.us/j/96367028599?pwd=VU9nOHZ1YW1hUnZGVXNPTVBhOWdkdz09__;!!BpyFHLRN4TMTrA!tt_kV2_FH9A631m17zfQHAyPu9DvDkxCiPRRA50o-8NkWhd6H2b5zfkWBTtv0kSZXw$>https://uchicagogroup.zoom.us/j/96367028599?pwd=VU9nOHZ1YW1hUnZGVXNPTVBhOWdkdz09<https://urldefense.com/v3/__https:/uchicagogroup.zoom.us/j/96367028599?pwd=VU9nOHZ1YW1hUnZGVXNPTVBhOWdkdz09__;!!BpyFHLRN4TMTrA!tt_kV2_FH9A631m17zfQHAyPu9DvDkxCiPRRA50o-8NkWhd6H2b5zfkWBTtv0kSZXw$>



The gravitational path integral has been a constant source of surprising insights despite it being poorly understood. One gets a handle on it by approximating the integral with a sum over saddle-point configurations that represent different semi-classical spacetimes with fluctuating quantum fields. Some of these configurations include spacetime wormholes that connect together different parts of spacetime, and which have recently been shown to grant gravity the knowledge of things it ought not to know about. For instance, they predict that closed universes have a one dimensional Hilbert space, that information that falls into a black hole can be recovered from the Hawking radiation, that gravity implements quantum error correction, that gravity is holographic, and that it can do all this while also doing your taxes. I will go over these recent advances and discuss which of these only a(n April's) fool would believe.



*******************************************************
Tiffany Kurns, Undergraduate Affairs Administrator
Department of Physics, Instructional Services Office
5720 S. Ellis Avenue, KPTC 205
Chicago, IL. 60637
Phone: 773-702-7019
tkurns at uchicago.edu<mailto:tkurns at uchicago.edu>



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