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arXiv · 2411.10417

On the thermodynamics of the black holes of the Cano-Ruipérez 4-dimensional string effective action

Tomás Ortín·Matteo Zatti
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Abstract

The Cano-Ruipérez 4-dimensional string effective action is the simplest consistent truncation of the first-order in $α'$ heterotic string effective action compactified on T$^{6}$. This theory contains, on top of the metric, a dilaton and an axion that couple to the Gauss-Bonnet term and to the Pontrjagin density which suggests a very strong relation between the physical and geometrical properties of its solutions. In this paper we study the thermodynamics of the string black-hole solutions of this theory using Wald's formalism. We construct the on-shell closed generalized Komar, dilaton and axion 2-form charges, and we used them to find the Smarr formula (that we test on the Schwarzschild and Kerr solutions) and to prove no-(primary)-hair theorems for the scalar. We find that $α'$ plays the role of a thermodynamical variable with an associated chemical potential. We also notice the occurrence of non-standard gravitational charges in the Wald entropy and scalar charges.

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Tomás Ortín, Matteo Zatti. 2024-11-15. On the thermodynamics of the black holes of the Cano-Ruipérez 4-dimensional string effective action. https://arxiv.org/abs/2411.10417

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