Preliminary analyses on dynamics and thermodynamics of rotating regular black holes

TL;DR

This paper examines the dynamic and thermodynamic properties of rotating regular black holes, revealing that most models do not fully satisfy the laws of thermodynamics and exploring potential modifications to reconcile these laws.

Contribution

It provides a comprehensive analysis of thermodynamic laws in rotating regular black holes and evaluates three specific models, highlighting their deviations from expected thermodynamic behavior.

Findings

None of the three models satisfies the first law of thermodynamics.

The second model satisfies only the second and third laws.

Modifications to entropy or phase space do not fully restore thermodynamic laws.

Abstract

We investigate the dynamic and thermodynamic laws governing rotating regular black holes. By analyzing dynamic properties, i.e., the interaction between scalar particles and rotating regular black holes, we establish the criteria that determine whether such black holes satisfy the laws of thermodynamics or not. In addition, we provide the general form of conserved quantities related to rotating regular black holes, including the relevant flows associated with neutral scalar particles. Meanwhile, we reexamine the relationship between the third law of thermodynamics and weak cosmic censorship conjecture for rotating regular black holes. In accordance with the criteria mentioned above, we discuss the laws of thermodynamics for three models of rotating regular black holes: Rotating Hayward black holes, Kerr black-bounce solutions, and loop quantum gravity black holes. Our findings indicate that none of the three models satisfies the first law of thermodynamics. In particular, the first and third models fail to comply with the three laws of thermodynamics, while the second model satisfies only the second and third laws of thermodynamics. Finally, we attempt to rescue the laws of thermodynamics by modifying entropy or extending phase space. However, the two scenarios are not able to ensure the three laws of thermodynamics in the three models, which reveals an unusual property of rotating regular black holes.