Thermodynamic overview and heat engine efficiency of Kerr–Sen–AdS black hole

Abstract

This paper reflects a study on the thermodynamic features of charged rotating Kerr–Sen–AdS black holes discussed with an extended phase space, where the negative cosmological constant is accounted for pressure. Thermal stability/instability and dependency of the phase transition points on the parameters of a black hole have been discussed further. The authors have systematically studied the throttling process of the black hole considering its mass is identified by its enthalpy. Moreover, the phenomenon of Joule–Thomson expansion has been explored, and inversion temperature for the black hole has been investigated using a numerical approach. Next, a heat engine is constructed by considering the black hole as a working object and subsequently, its efficiency is calculated by considering a rectangular heat cycle in the [Formula: see text]–[Formula: see text] plane. Then the effects of the black hole parameters on its efficiency and their respective roles are studied, followed by a careful comparison of the efficiency with that of a Carnot engine so that the second law of thermodynamics holds true.

Heat engines of the Kerr-AdS black hole

“…So it is interesting to consider the heat engine of the rotating AdS black hole, and to determine the influence of the angular momentum on the engine physics. The efficiency for the Carnot cycle of the Kerr-Sen-AdS black hole, which recovers the Kerr-AdS when the charge vanishes, was investigated in [40]. We will further investigate the Stirling engine and the Rankine engine.…”