Thermodynamic geometry of static and rotating regular black holes in conformal massive gravity

Abstract

A version of massive gravity, namely conformal massive gravity, is employed to study the behavior of thermodynamic geometry for both the static and the rotating regular black holes. Whereas in thermodynamic geometry singularity can be interpreted as the second phase transition, seeing such phenomena as heat capacity behavior for both cases is investigated in detail. In addition, other thermodynamic quantities like the entropy and the temperature are analyzed as well. Another important property of the black holes is the so-called stability, in which utilizing the first phase transition of the heat capacity is detailed, for both cases, say the static and the spinning black holes. It is also interestingly figured out that, the behavior of temperature of the uncharged black holes in the presence of hair parameter, $λ$, can mimic the charged ones. {The effects of scalar charge, $Q$, and hair parameters with both positive and negative signs and how it affects key parameters in the study of black holes are investigated as well.} To investigate the properties of the black holes both regular thermodynamics and thermodynamic geometry approaches are considered. Then one can observe that aiming to realize the physics of the black holes, many complicated phenomena can be analyzed dramatically easier by considering the latter approach.