Thermodynamics Of dilaton-axion black holes

TL;DR

This paper investigates the thermodynamic properties of dilaton-axion black holes in a generalized Einstein-Maxwell framework, confirming the area-entropy law, analyzing stability, and exploring phase transition possibilities.

Contribution

It provides a detailed analysis of thermodynamics for dilaton-axion black holes, including stability conditions and phase transition prospects, within a generalized scalar-coupled Einstein-Maxwell theory.

Findings

Bekenstein-Hawking area-entropy law holds for these black holes.

Black holes can be thermodynamically stable under certain parameters.

Potential phase transitions are discussed based on specific heat properties.

Abstract

Considering a generalised action for Einstein Maxwell theory in four dimensions coupled to scalar and pseudo-scalar fields, the thermodynamic properties of asymptotically flat black holes solutions in such a background are investigated. Bekenstein-Hawking area-entropy law is verified for these class of black holes. From the property of specific heat, it is shown that such black holes can be stable for certain choice of the parameters like charge, mass and the scalar vacuum expectation value. The possibility of a black hole phase transition is discussed in this context.