Astronomy and Astrophysics – Astrophysics – General Relativity and Quantum Cosmology
Scientific paper
1998-09-17
Phys.Rev. D59 (1999) 064009
Astronomy and Astrophysics
Astrophysics
General Relativity and Quantum Cosmology
Latex, 16 pages, arguments on gauge conditions and near-stationary entropy are added, accepted for publication in Physical Rev
Scientific paper
10.1103/PhysRevD.59.064009
The first law of black hole mechanics was derived by Wald in a general covariant theory of gravity for stationary variations around a stationary black hole. It is formulated in terms of Noether charges, and has many advantages. In this paper several issues are discussed to strengthen the validity of the Noether charge form of the first law. In particular, a gauge condition used in the derivation is justified. After that, we justify the generalization to non-stationary variations done by Iyer-Wald.
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