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  • Letter
  • Open Access

Higher-derivative corrections to black hole entropy at zero temperature

Brian McPeak*

  • Department of Physics, University of Pisa and INFN, Largo Pontecorvo 3, I-56127 Pisa, Italy

  • *brian.mcpeak@df.unipi.it
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Phys. Rev. D 105, L081901 – Published 11 April, 2022

DOI: https://doi.org/10.1103/PhysRevD.105.L081901

Abstract

There is a well-established connection between the higher-derivative corrections to the black hole entropy and the black hole extremality bound. The particular combination of effective field theory (EFT) coefficients ci that controls the mass shift at fixed charge and temperature also controls the entropy shift at fixed charge and mass, in the limit where the mass approaches the uncorrected value for the extremal mass. In this paper, we use the classical entropy function formalism to examine the entropy corrections at exactly zero temperature, or at the corrected value for the extremal mass. We find that the zero-temperature entropy shift (a) is unrelated to the mass shift, (b) is O(ci) in the EFT coefficients, rather than O(ci), as is the constant-mass entropy shift, and (c) is negative in the example of the EFT arising at low energies from QED plus gravity.

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Phys. Rev. D 105, L081901– Published 11 April, 2022
  • Received 7 January 2022
  • Accepted 31 January 2022
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