Dynamic black-hole entropy

Details Dynamic black-hole entropy Dynamic black-hole entropy

1998-10-02

arxiv.org/abs/gr-qc/9810006v1

Phys.Lett.A256:347-350,1999

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

3 pages, revtex

Scientific paper

10.1016/S0375-9601(99)00225-X

We consider two non-statistical definitions of entropy for dynamic (non-stationary) black holes in spherical symmetry. The first is analogous to the original Clausius definition of thermodynamic entropy: there is a first law containing an energy-supply term which equals surface gravity times a total differential. The second is Wald's Noether-charge method, adapted to dynamic black holes by using the Kodama flow. Both definitions give the same answer for Einstein gravity: one-quarter the area of the trapping horizon.

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