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arXiv · 2104.12720

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

Aritra Ghosh·Sudipta Mukherji·Chandrasekhar Bhamidipati
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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.

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Aritra Ghosh, Sudipta Mukherji, Chandrasekhar Bhamidipati. 2021-04-26. Logarithmic corrections to the entropy function of black holes in the open ensemble. https://doi.org/10.1016/j.nuclphysb.2022.115902

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