Effects of a string cloud on the criticality and efficiency of AdS black holes as heat engines

TL;DR

This paper investigates how a string cloud influences the thermodynamics, critical behavior, and heat engine efficiency of AdS black holes within general relativity and f(R) gravity frameworks.

Contribution

It introduces the effects of a string cloud on black hole criticality and heat engine performance, extending thermodynamic analysis to new matter distributions and gravity theories.

Findings

String cloud modifies black hole critical points and phase transitions.

The presence of a string cloud affects the efficiency of black holes as heat engines.

Critical behavior varies with the matter distribution and gravity theory.

Abstract

We study the black hole thermodynamics in the presence of a string cloud matter distribution, considering a work term due to a variable cosmological "constant" in arbitrary dimensions. Then, we explore the criticality of the system and the behavior of the black hole as a heat engine in the context of general relativity and metric f(R) gravity.