Static dilatonic black hole with nonlinear Maxwell and Yang-Mills fields of power-law type

TL;DR

This paper derives static spherically symmetric black hole solutions in Einstein-dilaton theory with nonlinear power-law Maxwell and Yang-Mills fields, analyzing their thermodynamics, phase transitions, and critical behavior.

Contribution

It introduces new black hole solutions with nonlinear gauge fields and explores their thermodynamic phase structure, including first and zeroth order phase transitions.

Findings

Black holes can have two horizons similar to linear gauge fields.

Existence of first order phase transitions below critical temperature and pressure.

Potential for zeroth order phase transitions at certain coupling parameters.

Abstract

Static spherically symmetric black hole solution is obtained in the framework of Einstein-dilaton theory with nonlinear Maxwell and Yang-Mills fields of power-law type. It is observed that black hole might have two horizons similarly as it takes place for linear gauge fields case. Thermodynamics of the black hole is studied, namely the behaviour of temperature is examined and the first law is written. The concept of extended phase space is also utilized, namely we have written and analyzed the equation of state for the black hole and examined the Gibbs free energy. The Gibbs free energy shows that there is the first order phase transition if the temperature or the pressure are below their critical values and coupling parameters are relatively small. Increasing of the coupling parameters might give rise to appearance of a domain with the zeroth order phase transition, the existence of the latter one is specific for other types of dilatonic black holes. Prigogine-Defay ratio has been calculated, it shows that at the critical point the phase transition is not exactly of the second order, it is closer to the glass-type phase transition since the Prigogine-Defay ratio is not equal to one.