Black hole masking and black hole thermodynamics
(1) Department of Physics and Technology, Kharkov V.N. Karazin National University, 4 Svoboda Square, Kharkov, 61077, Ukraine
Masking of black holes means that, for given total mass and Hawking temperatures, these data may correspond to either a "pure" black hole or a black hole of smaller mass surrounded by a massive shell. It is shown that there is a one-to one correspondence between this phenomenon and thermodynamics of a black hole in a finite size cavity: masking of black holes is possible if and only if there exists at least one locally unstable black hole solution in the corresponding canonical ensemble.
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