Effects of a cloud of strings on the extended phase space of Einstein-Gauss-Bonnet AdS black holes

TL;DR

This paper explores how a cloud of strings influences the thermodynamic phase transitions of Einstein-Gauss-Bonnet-AdS black holes, revealing Van der Waals-like behavior and phase transition modifications in an extended phase space.

Contribution

It analytically investigates the effects of a string cloud on EGB-AdS black hole thermodynamics and phase transitions, highlighting conditions for Van der Waals-like behavior.

Findings

Cloud of strings induces Van der Waals-like phase transitions.

Hawking-Page transition disappears with string cloud in the absence of Gauss-Bonnet term.

Joule-Thomson effect is not observed in this setup.

Abstract

In this paper we study the thermodynamics of Einstein-Gauss-Bonnet (EGB)-AdS black holes minimally coupled to a cloud of strings in an extended phase space where the cosmological constant is treated as pressure of the black holes and its conjugate variable is the thermodynamical volume of the black holes. To investigate the analogy between EGB black holes surrounded by a cloud of strings and liquid-gas system we derive the analytical solutions of the critical points and probe the effects of a cloud of strings on $P-V$ criticality. There is obtained resemblance between "small black hole/large black hole" (SBH/LBH) phase transition and the liquid-gas phase transition. We see that impact of a cloud of strings can bring Van der Waals-like behavior, in absence of the Gauss-Bonnet (GB) counterpart. In the other words, in the EGB black hole with $\alpha \to 0$ and when it is surrounded by a cloud of strings the Hawking-Page phase transition would be disappeared and SBH/LBH phase transition recovers. Also there is not happened Joule-Thomson effect.