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SUMMARY:Mehrdad Mirbabayi (ICTP)
DTSTART:20240311T100000Z
DTEND:20240311T110000Z
DTSTAMP:20260423T024824Z
UID:NKUA-HEP/15
DESCRIPTION:Title: <a href="https://researchseminars.org/talk/NKUA-HEP/15/
 ">An Observer's Measure of De Sitter Entropy</a>\nby Mehrdad Mirbabayi (IC
 TP) as part of NKUA HEP Seminars\n\n\nAbstract\nThe two-point correlation 
 function of a massive field\, measured along an observer's worldline in de
  Sitter (dS)\, decays exponentially in time. Meanwhile\, every dS observer
  is surrounded by a horizon and the holographic interpretation of the hori
 zon entropy S_dS suggests that the correlation function should stop decayi
 ng\, and start behaving erratically at late times. We find evidence for th
 is expectation in Jackiw-Teitelboim gravity by finding a topologically non
 trivial saddle\, which is suppressed by exp(-S_dS)\, and which gives a con
 stant contribution to the norm squared of the correlator. This constant mi
 ght have the interpretation of the late-time average over all microscopic 
 theories that have the same low-energy effective description. Based on arx
 iv-2311.07724.\n
LOCATION:https://researchseminars.org/talk/NKUA-HEP/15/
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