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SUMMARY:Don Marolf (UCSB)
DTSTART:20200409T203000Z
DTEND:20200409T223000Z
DTSTAMP:20260404T143401Z
UID:IFQ/5
DESCRIPTION:Title: <a href="https://stable.researchseminars.org/talk/IFQ/5
 /">Baby Universes and Black Hole Information</a>\nby Don Marolf (UCSB) as 
 part of It from Qubit\n\n\nAbstract\nIn the 1980’s\, work by Coleman and
  by Giddings and Strominger linked the physics of spacetime wormholes to 
 ‘baby universes’ and an ensemble of theories. We revisit such ideas\, 
 using features associated with a negative cosmological constant and asympt
 otically AdS boundaries to strengthen the results\, introduce a change in 
 perspective\, and connect with recent replica wormhole discussions of the 
 Page curve. A key new feature is an emphasis on the role of null states. W
 e explore this structure in detail in simple topological models of the bul
 k that allow us to compute the full spectrum of associated boundary theori
 es.  We also argue that similar properties must hold in any consistent gra
 vitational path integral.\n
LOCATION:https://stable.researchseminars.org/talk/IFQ/5/
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