• Black hole physics in globally hyperbolic space-times

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    • Keywords


      Black holes; general relativity; cosmology

    • Abstract


      The usual definition of a black hole is modified to make it applicable in a globally hyperbolic space-time. It is shown that in a closed globally hyperbolic universe the surface area of a black hole must eventually decrease. The implications of this breakdown of the black hole area theorem are discussed in the context of thermodynamics and cosmology. A modified definition of surface gravity is also given for non-stationary universes. The limitations of these concepts are illustrated by the explicit example of the Kerr-Vaidya metric.

    • Author Affiliations


      P S Joshi1 J V Narlikar1

      1. Tata Institute of Fundamental Research, Bombay - 400 005, India
    • Dates

  • Pramana – Journal of Physics | News

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      Posted on July 25, 2019

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