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DTSTART:20070311T020000
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DTSTAMP:20230821T111446
DTSTART;TZID=America/Detroit:20230906T110000
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SUMMARY:Lecture / Discussion:HET Brown Bag Seminar | Generalized entropy for general subregions in quantum gravity
DESCRIPTION:I will describe a construction of algebras of observables associated with local subregions in quantum gravity in the small G_N limit.  This algebra consists of operators dressed to a semiclassical observer degree of freedom which serves as an anchor defining the subregion.  I will argue that properly implementing the gravitational constraints on this algebra results in a type II von Neumann algebra\, which possesses a well-defined notion of entropy.  Up to a state-independent constant\, this entropy agrees with the UV-finite generalized entropy of the subregion\, consisting of a Bekenstein-Hawking area term and a bulk entropy term.  This gives an algebraic explanation for the finiteness of the generalized entropy\, and provides a number of tools for investigating aspects of semiclassical gravitational entropy\, including the generalized second law\, the quantum focusing conjecture\, and the quantum extremal surface prescription in holography.
UID:110530-21825018@events.umich.edu
URL:https://events.umich.edu/event/110530
CLASS:PUBLIC
STATUS:CONFIRMED
CATEGORIES:brown bag,Brown Bag Seminar,Physics,Science
LOCATION:Randall Laboratory - 3481
CONTACT:
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