Logarithmic corrections to the entropy function of black holes in the open ensemble

Abstract

An `open' or $(\mu ,P,T)$-ensemble describes equilibrium systems whose control parameters are chemical potential $\mu$, pressure $P$ and temperature $T$. Such an unconstrained ensemble is seldom used for applications to standard thermodynamic systems due to the fact that the corresponding free energy identically vanishes as a result of the Euler relation. However, an open ensemble is perfectly regular for the case of black holes, as the entropy is a quasi-homogeneous function of extensive thermodynamic variables with scaling dictated by the Smarr formula. Following a brief discussion on thermodynamics in the open ensemble, we compute the general form of logarithmic corrections to the entropy of a typical system, due to fluctuations in energy, thermodynamic volume and a generic charge $N$. This is then used to obtain the exact analytic form of the logarithmically corrected black hole entropy for charged and rotating black holes in anti-de Sitter spacetimes.

arXiv commentv2: 24 pages,4 figures, major revision, erroneous discussion on critical points in earlier version corrected and figures replotted, new appendix added, key conclusions and results unchanged, matches published version

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• Statistical ensembles and logarithmic corrections to black hole entropy
• Black hole thermodynamic free energy as $A$-discriminants