Entropy of Reissner-Nordström-de Sitter black hole

Abstract

Based on the consideration that the black hole horizon and the cosmological horizon of Reissner-Nordström black hole in de Sitter space are not independent each other, we conjecture the total entropy of the system should have an extra term contributed from the entanglement between the two horizons, except for the sum of the two horizon entropies. Making use of the globally effective first law and the effective thermodynamic quantities, we derive the total entropy and find that it will diverge as the two horizons tends to coincide.

arXiv comment3 pages, 2 figures. In the published version, there are some errors in the equations (13-15). We correct them in this version. The conclusion is not affected

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• Overview of thermodynamic properties for Reissner-Nordstrom-de Sitter spacetime in induced phase space
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• Hawking radiation inside a charged, cosmological black hole
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• Reissner-Nordström black holes in de Sitter space-time: bounds with quasinormal frequencies