Thermal fluctuations of black holes with non-linear electrodynamics and charged Renyi entropy

TL;DR

This paper extends charged Renyi entropy to a holographic framework involving non-linear electrodynamics, analyzing black hole thermodynamics and thermal fluctuations, with implications for condensed matter systems and holography beyond saddle points.

Contribution

It introduces a general holographic model coupling non-linear electrodynamics to AdS gravity and derives formulas for thermodynamic quantities and fluctuations in this setting.

Findings

Derived a general form for holographic quantities in non-linear electrodynamics

Computed the first thermal fluctuation of charged Renyi entropy

Identified logarithmic divergence in entanglement entropy related to IR effects

Abstract

We extend the charged Renyi entropy to a more general holographic scenario. Coupling an arbitrary non-linear electrodynamics Lagrangian density to AdS gravity, we analyse the thermodynamic features of non-linearly charged hyperbolic black holes and the thermal fluctuations in the grand canonical ensemble. We provide a general form for the relevant holographic quantities that describes a CFT with a global $U(1)$ symmetry in terms of horizon data and we compute the first thermal fluctuation of the charged Renyi entropy. We demonstrate the validity of the formulae through an analytic example; the Coulomb source in $2+1$ dimensions. We propose this model to be dual to charged free bosons in $1+1$ dimensions. The corrections generates a subleading logarithmic divergence in the entanglement entropy which appear in some Condensed Matter systems with spontaneous symmetry breaking due to IR effects in the ground state. We comment on the possibility of interpreting these results in terms of holography beyond the saddle point approximation.