[Todos] Quantum Gravity and All of That: Jan 20, 2022 - "Gravity and the Crossed Product", by Edward Witten (Princeton, Inst. Advanced Study)

[Ernesto Arganda Carreras]

---------- Forwarded message ---------
De: *Alexey Koshelev* <alex.koshelev en ubi.pt>
Date: mar, 18 ene 2022 a las 23:04
Subject: Quantum Gravity and All of That: Jan 20, 2022
To: <agustin.sabio en uam.es>


Dear Participant
of "Quantum Gravity and All of That" seminar series,

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This Thursday, January 20, 2022 at 17.00 CET
(08:00 Los Angeles, 11:00 New York, 19:00 Moscow, 01:00 (next day) Tokyo)
we are pleased to have the talk

Title: Gravity and the Crossed Product

Speaker: Edward Witten (Princeton, Inst. Advanced Study)

Abstract: Recently Leutheusser and Liu [1,2] identified an emergent
algebra of Type III_1 in the operator algebra of N=4 super Yang-Mills
theory for large N. Here we describe some 1/N corrections to this
picture and show that the emergent Type III_1 algebra becomes an algebra
of Type II_∞. The Type II_∞ algebra is the crossed product of the Type
III_1 algebra by its modular automorphism group. In the context of the
emergent Type II_∞ algebra, the entropy of a black hole state is
well-defined up to an additive constant, independent of the state. This
is somewhat analogous to entropy in classical physics.


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https://us02web.zoom.us/j/85312157735?pwd=WW5qRmVQS2MxcVFTaDVPMlpDeE10UT09

Meeting ID: 853 1215 7735
Passcode: QGaAoT2122

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