Black Holes without Event Horizons

Details Black Holes without Event Horizons Black Holes without Event Horizons

2008-02-23

arxiv.org/abs/0802.3422v1

J.Korean Phys.Soc.54:2576-2582,2009

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

Talk at APCTP Winter School, Daejeon, Korea, 2008. 7 pages, no figures

Scientific paper

10.3938/jkps.54.2576

We discuss some of the drawbacks of using event horizons to define black holes. The reasons are both practical, physical and theoretical. We argue that locally defined trapping horizons can remedy many of these drawbacks. We examine of the question of whether black hole thermodynamics should be associated with event horizons or trapping horizons. To this end we discuss what role trapping horizons may play in black hole thermodynamics. In addition, we show how trapping horizons may give rise to Hawking radiation and discuss the issue of gravitational entropy.

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