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<div dir="ltr" class="gmail_attr">De: <strong
class="gmail_sendername" dir="auto">Alexey Koshelev</strong>
<span dir="auto"><<a href="mailto:alex.koshelev@ubi.pt"
moz-do-not-send="true" class="moz-txt-link-freetext">alex.koshelev@ubi.pt</a>></span><br>
Date: mar, 18 ene 2022 a las 23:04<br>
Subject: Quantum Gravity and All of That: Jan 20, 2022<br>
To: <<a href="mailto:agustin.sabio@uam.es"
moz-do-not-send="true" class="moz-txt-link-freetext">agustin.sabio@uam.es</a>><br>
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<br>
<br>
Dear Participant<br>
of "Quantum Gravity and All of That" seminar series,<br>
<br>
As a short house keeping we want to stress that in order to
minimize the <br>
risk of intrusion accidents during seminars we kindly ask you:<br>
- not to distribute the seminar zoom link randomly<br>
- login with a recognizable name<br>
<br>
This Thursday, January 20, 2022 at 17.00 CET<br>
(08:00 Los Angeles, 11:00 New York, 19:00 Moscow, 01:00 (next
day) Tokyo)<br>
we are pleased to have the talk<br>
<br>
Title: Gravity and the Crossed Product<br>
<br>
Speaker: Edward Witten (Princeton, Inst. Advanced Study)<br>
<br>
Abstract: Recently Leutheusser and Liu [1,2] identified an
emergent <br>
algebra of Type III_1 in the operator algebra of N=4 super
Yang-Mills <br>
theory for large N. Here we describe some 1/N corrections to
this <br>
picture and show that the emergent Type III_1 algebra becomes
an algebra <br>
of Type II_∞. The Type II_∞ algebra is the crossed product of
the Type <br>
III_1 algebra by its modular automorphism group. In the
context of the <br>
emergent Type II_∞ algebra, the entropy of a black hole state
is <br>
well-defined up to an additive constant, independent of the
state. This <br>
is somewhat analogous to entropy in classical physics.<br>
<br>
<br>
Here are the ZOOM coordinates:<br>
<br>
<a
href="https://us02web.zoom.us/j/85312157735?pwd=WW5qRmVQS2MxcVFTaDVPMlpDeE10UT09"
rel="noreferrer" target="_blank" moz-do-not-send="true"
class="moz-txt-link-freetext">https://us02web.zoom.us/j/85312157735?pwd=WW5qRmVQS2MxcVFTaDVPMlpDeE10UT09</a><br>
<br>
Meeting ID: 853 1215 7735<br>
Passcode: QGaAoT2122<br>
<br>
We especially note that after the talk we will keep discussing
giving an<br>
opportunity to as many people as reasonable to participate.<br>
We do not impose any time limits for discussions.<br>
<br>
We are looking forward to welcoming you at the seminar.<br>
<br>
With very warm regards,<br>
the Organizers<br>
<br>
PS You can unsubscribe from future announcements regarding
"Quantum<br>
Gravity and All of That" seminar series at any moment by
sending a<br>
free-form e-mail preferably mentioning UNSUBSCRIBE in the
subject to<br>
<a href="mailto:qgholqi@mi-ras.ru" target="_blank"
moz-do-not-send="true" class="moz-txt-link-freetext">qgholqi@mi-ras.ru</a><br>
This will also make you removed from the list of the seminar
participants.<br>
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