The Entropy Relations of Black Holes with Multihorizons in Higher Dimensions

Abstract

We study the entropy relations of multi-horizons black holes in higher dimensional (A)dS spacetime with maximal symmetries, including Einstein-Maxwell gravity and $f(R)$(-Maxwell) gravity. These additional equalities in thermodynamics are expected to be useful to understanding the origin of black hole entropy at the microscopic level. Revisiting the entropy product introduced by Cvetic etc, in our case, it has an unexpected behavior. It is shown that this electric charge $Q$ plays an important role in this entropy product. The entropy product of charged black holes only depends on the electric charge $Q$ and is mass independence. When $Q$ vanishes in the solution, it turns to mass dependence, even when including the effect of the un-physical ``virtual'' horizons. In this sense, the ``universal relation'' of this entropy product is destroyed. Then we introduce another kind of ``universal'' entropy relation, which only depends on the cosmological constant $\Lambda$ and the background topology $k$, and which does not depend on the conserved charges $Q$, nor even the mass $M$.

9 pages, revtex4-1, Accepted for publication in Physical Review D

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• Higher dimensional charged $f(R)$ black holes
• Inner Cauchy horizon of axisymmetric and stationary black holes with surrounding matter in Einstein-Maxwell theory
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• Mass Dependence of the Entropy Product and Sum
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• Angular Momentum Independence of the Entropy Sum and Entropy Product for AdS Rotating Black Holes In All Dimensions
• Universal entropy relations: entropy formulae and entropy bound
• Angular Momentum-Free of the Entropy Relations for Rotating Kaluza-Klein Black Holes