PIRSA:20070015

Black hole information, spacetime wormholes, and baby universes

APA

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

MLA

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

BibTex

          @misc{ pirsa_20070015,
            doi = {},
            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},
            year = {2020},
            month = {jul},
            note = {PIRSA:20070015 see, \url{https://pirsa.org}}
          }
          

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.