PIRSA:18040130

Causal properties of evaporating black holes

Lesourd, M. (2018). Causal properties of evaporating black holes. Perimeter Institute. https://pirsa.org/18040130

Lesourd, Martin. Causal properties of evaporating black holes. Perimeter Institute, Apr. 19, 2018, https://pirsa.org/18040130 

          @misc{ pirsa_PIRSA:18040130,
            doi = {10.48660/18040130},
            url = {https://pirsa.org/18040130},
            author = {Lesourd, Martin},
            keywords = {Quantum Gravity},
            language = {en},
            title = {Causal properties of evaporating black holes},
            publisher = {Perimeter Institute},
            year = {2018},
            month = {apr},
            note = {PIRSA:18040130 see, \url{https://pirsa.org}}
          }

Martin Lesourd

University of Oxford

Talk number
PIRSA:18040130
Collection
Talk Type
Subject
Abstract

The causal structure of spacetimes containing fully evaporated black holes is considered from the perspective of Lorentzian geometry. The starting point is provided by theorems, due to Kodama, Geroch and Wald, that derive non-global hyperbolicity from a set of premises relating two partial Cauchy surfaces that are thought of as, respectively, lying before and after the evaporation. Here, we consider the Geroch-Wald theorem in the setting of a conformally embedded spacetime a la Penrose and show, under the assumption that complete null geodesics outside the black hole reach the boundary, that there exists visible incomplete null geodesics and that causal continuity fails.