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Entropy Evaporated by a Black Hole

1982; American Physical Society; Volume: 49; Issue: 23 Linguagem: Inglês

10.1103/physrevlett.49.1683

1092-0145

Wojciech H. Zurek,

Quantum Electrodynamics and Casimir Effect

It is shown that the entropy of the radiation evaporated by an uncharged, nonrotating black hole into vacuum in the course of its lifetime is approximately $\frac{4}{3}$ times the initial entropy of this black hole. Also considered is a thermodynamically reversible process in which an increase of black-hole entropy is equal to the decrease of the entropy of its surroundings. Implications of these results for the generalized second law of thermodynamics and for the interpretation of black-hole entropy are pointed out.