Black hole masking and black hole thermodynamics
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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.
KeywordsBlack Hole Canonical Ensemble Massive Shell Black Hole Thermodynamic Microcanonical Ensemble