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X-FROM-URL:https://eom.sdu.dk/events/ical/8e19cf74-8ab0-4d59-9f4f-c9fbc739
 48d3
X-WR-CALNAME:QM Research Seminar: Entanglement and geometric transitions i
 n topological string theory
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TZID:Europe/Copenhagen
X-LIC-LOCATION:Europe/Copenhagen
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DTSTAMP:20260602T163100Z
DTSTART:20261028T030000
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DTSTART:20260325T020000
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DESCRIPTION:How do we define a subsystem in quantum gravity?  This is an e
 ssential prerequisite to formulating a notion of quantum information in g
 ravitational theories.   In this talk we will answer this question in a t
 oy model of quantum gravity given by topological string theory. We explai
 n how a subsystem of  closed strings is given by open strings which end o
 n the at large N number of D branes that play the role of a stringy entan
 gling surface.   The entangling of these open strings reproduces the orig
 inal closed strings via a geometric transition\, in which  ``entanglement
  branes" dissolve into closed string flux.   This geometric transition re
 presents a type of local holography closely related to Gopakuma-Vafa dual
 ity\, and therefore employs the same worldsheet mechanism.    The factori
 zation of closed  strings into open strings can be mapped to  the factori
 zation of closed Wilson loops into open Wilson lines in large N Chern Sim
 ons theory.    We explain how these subregion Wilson lines are described 
 by an open string operator algebra\, which provides an algebraic definiti
 on of a subsystem in string theory.    Finally\, we show how the geometri
 c transition of entanglement branes is implemented by a quantum trace on 
 the open string algebra.
DTEND:20251201T150000Z
DTSTAMP:20260602T163100Z
DTSTART:20251201T140000Z
LOCATION:Syddansk Universitet\, Campusvej 55\, 5230\, Odense M
SEQUENCE:0
SUMMARY:QM Research Seminar: Entanglement and geometric transitions in top
 ological string theory
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