$P-V$ criticality and Joule-Thomson Expansion of Hayward-AdS black holes in 4D Einstein-Gauss-Bonnet gravity

TL;DR

This paper investigates the thermodynamic phase transitions and Joule-Thomson expansion of Hayward-AdS black holes within 4D Einstein-Gauss-Bonnet gravity, revealing Van der Waals-like behavior and analyzing cooling-heating regions.

Contribution

It demonstrates that Hayward-AdS black holes exhibit Van der Waals-like phase transitions in extended phase space for any positive parameters, and explores the effects of these parameters on inversion and isenthalpic curves.

Findings

Black holes show Van der Waals-like phase transition behavior.

Inversion and isenthalpic curves are plotted to identify cooling and heating regions.

The phase transition characteristics are independent of specific positive parameters.

Abstract

In this paper, the $P-V$ criticality and Joule-Thomson Expansion of Hayward-AdS black holes in 4D Einstein-Gauss-Bonnet gravity are studied in the extended phase space. We find the black hole always exhibits a phase transition similar to that of the Van der Waals system for any arbitrary positive parameters $\alpha$ and $g$. We also study the dependence of $\alpha$ and $g$ on the inversion curves and plot the inversion and isenthalpic curves in the $T-P$ plane, which can determine the cooling-heating regions.