Probing phase transitions and microscopic interactions in quasi-topological black holes

TL;DR

This study investigates the thermodynamic geometry of four-dimensional quasi-topological black holes, revealing microstructure interactions and phase transitions through the analysis of the Ruppeiner scalar curvature.

Contribution

It introduces novel black hole solutions in generalized quasi-topological gravity with a p-form field and analyzes their thermodynamic geometry to identify phase transitions.

Findings

Ruppeiner scalar curvature indicates microstructure interactions

A single zero-crossing of R signals a second-order phase transition

Thermodynamic behavior is streamlined with clear critical points

Abstract

In this paper, we examine the thermodynamic geometry of four-dimensional quasi-topological black holes by computing the Ruppeiner scalar curvature R which serves as an empirical tool to describe the nature of interactions among black hole microstructures. In four dimensions, we write novel black hole solutions within the framework of generalized quasi-topological gravity, extended through a fundamental p-form field. Temperature, entropy, and thermodynamic volume are explicitly expressed using the extended first law. The nature of the interactions between the microstructure is then revealed by computing R, where positive curvature indicates repulsion dominant interactions and negative curvature indicates the dominance of attraction. Our approach uses divergences and sign changing nature of R to identify critical points and phase transitions. Further, our analysis reveals a notably streamlined thermodynamic behavior, a single zero-crossing of curvature R, marking a second-order phase transition and offering direct insight into the underlying microstructure interactions.