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SUMMARY:An Observer's Measure of De Sitter Entropy
DTSTART:20250303T140000
DTEND:20250303T151500
DTSTAMP:20260506T135014Z
UID:2d0d4aa5827c8b82792825f284431d2a58250dfe350babc8d94e0e1e
CATEGORIES:Conferences - Seminars
DESCRIPTION:Mehrdad Mirbabayi (ICTP)\nThe two-point correlation function o
 f a massive field\, measured along an observer's worldline in de Sitter
  (dS)\, decays exponentially in time. Meanwhile\, every dS observer is s
 urrounded by a horizon and the holographic interpretation of the horizon e
 ntropy S_dS suggests that the correlation function should stop decaying\, 
 and start behaving erratically at late times. We find evidence for this ex
 pectation in Jackiw-Teitelboim gravity by finding a topologically nontrivi
 al saddle\, which is suppressed by exp(-S_dS)\, and which gives a constant
  contribution to the norm squared of the correlator. This constant might h
 ave the interpretation of the late-time average over all microscopic theor
 ies that have the same low-energy effective description. Based on arxiv-23
 11.07724.
LOCATION:BSP 727 https://plan.epfl.ch/?room==BSP%20727 https://epfl.zoom.u
 s/j/69362612859
STATUS:CONFIRMED
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