Black hole boundaries

  title={Black hole boundaries},
  author={Ivan Booth},
  journal={Canadian Journal of Physics},
  • I. Booth
  • Published 26 August 2005
  • Physics
  • Canadian Journal of Physics
Classical black holes and event horizons are highly nonlocal objects, defined in relation to the causal past of future null infinity. Alternative, quasilocal characterizations of black holes are often used in mathematical, quantum, and numerical relativity. These include apparent, Killing, trapping, isolated, dynamical, and slowly evolving horizons. All of these are closely associated with two-surfaces of zero outward null expansion. This paper reviews the traditional definition of black holes… 
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