Black holes and black hole thermodynamics without event horizons

Details Black holes and black hole thermodynamics without event horizons Black holes and black hole thermodynamics without event horizons

2008-09-23

arxiv.org/abs/0809.3850v1

Gen.Rel.Grav.41:1539-1584,2009

Physics

High Energy Physics

High Energy Physics - Theory

Invited review article for General Relativity and Gravitation. 43 pages

Scientific paper

10.1007/s10714-008-0739-9

We investigate whether black holes can be defined without using event horizons. In particular we focus on the thermodynamic properties of event horizons and the alternative, locally defined horizons. We discuss the assumptions and limitations of the proofs of the zeroth, first and second laws of black hole mechanics for both event horizons and trapping horizons. This leads to the possibility that black holes may be more usefully defined in terms of trapping horizons. We also show how Hawking radiation can also be seen to arise from trapping horizons and discuss which horizon area should be associated with the gravitational entropy.

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