PIRSA Logo


PERIMETER INSTITUTE RECORDED SEMINAR ARCHIVE

PIRSA:20070015  ( MP4 Medium Res , MP3 , PDF ) Which Format?
Black hole information, spacetime wormholes, and baby universes
Speaker(s): Henry Maxfield
Abstract: Recent discoveries suggest that semiclassical gravity is more consistent with unitarity than previously believed. I will argue that it makes predictions for the measurements of asymptotic observers that are in complete accord with the idea that black holes are ordinary quantum systems, with states counted by the Bekenstein-Hawking formula. The argument uses the semiclassical gravitational path integral, incorporating newly discovered `spacetime wormhole' topologies. These new ideas revive an old paradigm, relating the information problem to the physics of baby universes.
Date: 16/07/2020 - 1:15 pm
Valid XHTML 1.0!