Abstract
The entropy upper bound for a charged black hole in equilibrium with thermal radiation is derived by means of a general model-independent approach. This bound in some ways improves that proposed by Bekenstein by taking into account the energy of the electrical field. The corresponding lower bound for the Euclidean action is also obtained. The particular role of black-hole physics in the context under consideration is discussed.
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Zaslavskii, O.B. Entropy and action bounds for charged black holes. Gen Relat Gravit 24, 973–983 (1992). https://doi.org/10.1007/BF00759127
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DOI: https://doi.org/10.1007/BF00759127