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SUMMARY:Firewalls from General Covariance
DTSTART:20250328T130000Z
DTEND:20250328T140000Z
DTSTAMP:20260616T025300Z
UID:indico-event-46086@agenda.infn.it
DESCRIPTION:Speakers: Raphael Bousso (UC\, Berkeley)\n\nI define "horizon 
 normalcy" as the approximate validity of Semiclassical Gravity and Effecti
 ve Field Theory\, for the description of observers that approach or cross 
 a black hole horizon. If black holes return information\, then horizon nor
 malcy must fail substantially\, at least in some global states. Proposals 
 such as ER=EPR and nonisometric maps assert that horizon normalcy persists
 \, so long as the Hawking radiation remains in a computationally simple st
 ate. Here I argue that state-dependent horizon normalcy - independently of
  the underlying mechanism\, and independently of the class of radiation st
 ates asserted to guarantee normalcy - requires a breakdown of general cova
 riance far from the black hole\, or else horizon normalcy will depend on t
 he infinite future of the exterior. This is because the radiation can be i
 n different states at different events\, all spacelike to the horizon cros
 sing event whose normalcy is at stake. I discuss a related effect in AdS/C
 FT\, and I argue that its resolution by timefolds is of no help here.\n\nh
 ttps://agenda.infn.it/event/46086/
LOCATION:Aula Grassano
URL:https://agenda.infn.it/event/46086/
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