<< September 2019 >>
 
 >>
 >>
 >>
 >>
 >>
Sun Mon Tue Wed Thu Fri Sat
 1   2   3   4   5   6   7 
 8   9   10   11   12   13   14 
 15   16   17   18   19   20   21 
 22   23   24   25   26   27   28 
 29   30   
 
Add an Event Edit This Event

This Week at Physics

<< Spring 2019 Fall 2019 Spring 2020 >>
Subscribe to receive email announcements of events

Event Number 5196

  Wednesday, September 25th, 2019

Theory Seminar (High Energy/Cosmology)
An Entropic Bound on the Lifetime of De Sitter Space
Time: 4:00 pm
Place: 5280 Chamberlin Hall
Speaker: Lars Aalsma, UW-Madison dept of Physics
Abstract: Abstract: What does the finiteness of the de Sitter entropy teach us about cosmology? In this talk, I will present evidence that 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 Unruh-de Sitter state - which is the cosmological analogue of the Unruh state that describes evaporating black holes. I will compare and contrast the obtained bound with other recent works that suggest that quantum (gravity) effects limit the lifetime of de Sitter space.
Host: Nicholas Orlofsky
Add this event to your calendar

©2013 Board of Regents of the University of Wisconsin System