Baby Universes and Holography II: Observer Complementarity

          @misc{ scivideos_PIRSA:25060026,
            doi = {10.48660/25060026},
            url = {https://pirsa.org/25060026},
            author = {Gesteau, Elliott},
            keywords = {Quantum Gravity, Quantum Information},
            language = {en},
            title = {Baby Universes and Holography II: Observer Complementarity},
            publisher = {Perimeter Institute for Theoretical Physics},
            year = {2025},
            month = {jun},
            note = {PIRSA:25060026 see, \url{https://scivideos.org/index.php/pirsa/25060026}}
          }
          

Abstract

The notion of complementarity, first introduced in the context of the information paradox, posits that the experiences of two observers who cannot communicate need not match in quantum gravity. In the context of the previous talk, I will argue that the recent proposals for explicitly taking observers into account provide a way to describe semiclassical closed universes in holography, at the expense of a resort to complementarity. I will then discuss an analogous setup in the case of an evaporating black hole, and propose a set of general principles for black hole complementarity. This talk is based on an ongoing collaboration with Netta Engelhardt and Daniel Harlow.