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VERSION:2.0
CALSCALE:GREGORIAN
PRODID:UW-Madison-Physics-Events
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SEQUENCE:3
UID:UW-Physics-Event-6713
DTSTART:20211117T190000Z
DTEND:20211117T200000Z
DTSTAMP:20260413T043440Z
LAST-MODIFIED:20211115T191947Z
LOCATION:Chamberlin 5280
SUMMARY:No Page curves for the de Sitter horizon\, Theory Seminar (Hig
 h Energy/Cosmology)\, Evita Verheijden\, University of Amsterdam
DESCRIPTION:One of the greatest puzzles in our universe\, which can --
  to good approximation -- be described by de Sitter space\, is a prope
 r understanding of the cosmological horizon that surrounds any observe
 r. Over the past few years\, a semi-classical approach involving quant
 um extremal surfaces and so-called ‘islands’ has been very success
 ful to increase our understanding of the black hole information proble
 m\; in light of these advancements\, it could prove fruitful to undert
 ake a similar approach to investigate an evaporating de Sitter horizon
 . In this talk I will consider such an approach for two-dimensional de
  Sitter space. Starting from three-dimensional de Sitter space\, I wil
 l show how a partial dimensional reduction supplies 2D JT de Sitter wi
 th an auxiliary system acting as a heat bath. I will then contrast the
  time-dependent entropy of radiation collected by an observer at futur
 e infinity with that collected by an observer inside the static patch.
  Central to the analysis in the static patch is the identification of 
 a weakly-coupled region close to the cosmological horizon. I will high
 light how backreaction considerations crucially obstruct both observer
 s from witnessing unitary evaporation.
URL:https://www.physics.wisc.edu/events/?id=6713
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