Video URL

https://pirsa.org/20070015

Black hole information, spacetime wormholes, and baby universes

Maxfield, H. (2020). Black hole information, spacetime wormholes, and baby universes. Perimeter Institute for Theoretical Physics. https://pirsa.org/20070015

Maxfield, Henry. Black hole information, spacetime wormholes, and baby universes. Perimeter Institute for Theoretical Physics, Jul. 16, 2020, https://pirsa.org/20070015 

          @misc{ scivideos_PIRSA:20070015,
            doi = {10.48660/20070015},
            url = {https://pirsa.org/20070015},
            author = {Maxfield, Henry},
            keywords = {Cosmology, Particle Physics, Quantum Foundations, Quantum Gravity, Quantum Information},
            language = {en},
            title = {Black hole information, spacetime wormholes, and baby universes},
            publisher = {Perimeter Institute for Theoretical Physics},
            year = {2020},
            month = {jul},
            note = {PIRSA:20070015 see, \url{https://scivideos.org/pirsa/20070015}}
          }

Henry Maxfield University of California, Santa Barbara

DOI 10.48660/20070015
Source Repository PIRSA
Collection
Talk Type Conference
Subject

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.