Joule-Thomson expansion of Reissner-Nordstrom-Anti-de Sitter black holes with cloud of strings and quintessence

The Joule-Thomson expansion is studied for Reissner-Nordstrom-Anti-de Sitter black holes with cloud of strings and quintessence, as well as its thermodynamics. The cosmological constant is treated as thermodynamic pressure, whose conjugate variable is considered as the volume. The characteristics of the Joule-Thomson expansion are studied in four main aspects with the case of omega = -1 and omega = -2/3, including the Joule-Thomson coefficient, the inversion curves, the isenthalpic curves and the ratio between the minimum inversion temperature T-i(min) and the critical temperature T-c. The sign of the Joule-Thomson coefficient is possible for determining the occurrence of heating or cooling. The divergent point of the Joule-Thomson coefficient corresponds to the zero point of the Hawking temperature. Unlike the van der Waals fluids, the inversion curve of the black hole is not closed. The inversion curve is the dividing line between heating and cooling regions, above which the slope of the isenthalpic curve is positive and cooling occurs, and the cooling-heating critical point is more sensitive to Q. Concerning the ratio T-i(min)/T-c , we calculate it separately in the cases where only the cloud of strings, only quintessence and both are present. (C) 2021 Elsevier B.V. All rights reserved.

Automated summary

The study focuses on the Joule-Thomson expansion of Reissner-Nordstrom-Anti-de Sitter black holes with cloud of strings and quintessence, analyzing its thermodynamics and characteristics in relation to omega values, refrigeration and heating effects, critical points, and sensitivity to parameters. The analysis reveals significant differences with van der Waals fluids and provides insights into the behavior of black hole inversion curves in determining cooling and heating regions. The research also calculates the ratio of minimum inversion temperature to critical temperature in various scenarios.