BEGIN:VCALENDAR
VERSION:2.0
CALSCALE:GREGORIAN
PRODID:UW-Madison-Physics-Events
BEGIN:VEVENT
SEQUENCE:1
UID:UW-Physics-Event-5196
DTSTART:20190925T210000Z
DURATION:PT1H0M0S
DTSTAMP:20260415T053905Z
LAST-MODIFIED:20190919T183218Z
LOCATION:5280 Chamberlin Hall
SUMMARY:An Entropic Bound on the Lifetime of De Sitter Space\, Theory 
 Seminar (High Energy/Cosmology)\, Lars Aalsma\, UW-Madison dept of Phy
 sics
DESCRIPTION:Abstract: What does the finiteness of the de Sitter entrop
 y teach us about cosmology? In this talk\, I will present evidence tha
 t it puts a bound on the amount of (quasi-)exponential expansion that 
 can be sustained in semi-classical gravity. We will see how this bound
  arises by considering a new quantum state of de Sitter space - the Un
 ruh-de Sitter state - which is the cosmological analogue of the Unruh 
 state that describes evaporating black holes. I will compare and contr
 ast the obtained bound with other recent works that suggest that quant
 um (gravity) effects limit the lifetime of de Sitter space.
URL:https://www.physics.wisc.edu/events/?id=5196
END:VEVENT
END:VCALENDAR