Black Holes with Less Entropy Than A/4

Details Black Holes with Less Entropy Than A/4 Black Holes with Less Entropy Than A/4

2001-09-11

arxiv.org/abs/gr-qc/0109040v2

Phys.Rev. D65 (2002) 024017

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

26 pages, LaTeX, no figures, accepted 2001 Sept. 25 for Phys. Rev. D. Comments added on ineffective reflection of gravitationa

Scientific paper

10.1103/PhysRevD.65.024017

One can increase one-quarter the area of a black hole, A/4, to exceed the total thermodynamic entropy, S, by surrounding the hole with a perfectly reflecting shell and adiabatically squeezing it inward. A/4 can be made to exceed S by a factor of order unity before the shell enters the Planck regime, though practical limitations are much more restrictive. One interpretation is that the black hole entropy resides in its thermal atmosphere, and the shell restricts the atmosphere so that its entropy is less than A/4.

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