Thermodynamic Relations for Kiselev and Dilaton Black Hole

TL;DR

This paper explores the thermodynamics and phase transitions of Kiselev and dilaton black holes, analyzing various thermodynamic products and their universality, and verifying the first law of thermodynamics.

Contribution

It provides new calculations of thermodynamic products for Kiselev and dilaton black holes, highlighting which are universal and analyzing phase transitions.

Findings

Products of areas and entropies are independent of black hole mass.

Products of surface gravities and temperatures are not universal.

Phase transitions occur under specific conditions.

Abstract

We investigate the thermodynamics and phase transition for Kiselev black hole and dilaton black hole. Specifically we consider Reissner Nordstrom black hole surrounded by radiation and dust, and Schwarzschild black hole surrounded by quintessence, as special cases of Kiselev solution. We have calculated the products relating the surface gravities, surface temperatures, Komar energies, areas, entropies, horizon radii and the irreducible masses at the Cauchy and the event horizons. It is observed that the product of surface gravities, surface temperature product and product of Komar energies at the horizons are not universal quantities for the Kiselev solutions while products of areas and entropies at both the horizons are independent of mass of the above mentioned black holes (except for Schwarzschild black hole surrounded by quintessence). For charged dilaton black hole, all the products vanish. First law of thermodynamics is also verified for Kiselev solutions. Heat capacities are calculated and phase transitions are observed, under certain conditions.