Thermodynamic Phase Transition of Generalized Ayon-Beato Garcia Black Holes

Abstract

In this work we study thermodynamics of generalized Ayon-Beato and Garcia (ABG) black hole metric which contains three parameters named as mass $m$, magnetic charge $q$ and dimensionless coupling constant of nonlinear electrodynamics interacting field $\gamma$. We showed that central regions of this black hole behaves as dS(AdS) vacuum space by setting $q<2m(q>2m)$ and in the case $q=2m$ reaches to a flat Minkowski space. In the large distances this black hole behaves as a Reissner-Nordstrom BH. However important role of the charge q is appeared in produce of a formal variable cosmological parameter which will support pressure coordinate in the thermodynamic perspective of this black hole in our setup. We should be point that this formal variable cosmological parameter is different with cosmological constant which comes from AdS/CFT correspondence and it is effective at large distances as AdS space pressure. In our setup the assumed pressure is originated from internal material of the black hole say q and m here. By calculating the Hawking temperature of this black hole we obtain equation of state. Then we plotted isothermal P-v curves and heat capacity at constant pressure. They show that the system participates in the small to large phase transition of the black hole or the Hawking-Page phase transition which is similar to the Van der Waals phase transition in the ordinary thermodynamics systems . In fact in the Hawking-Page phase transition disequilibrium evaporating generalized ABG black hole reaches to a vacuum AdS space finally.

arXiv comment17 pages, 2 figures and 2 tables, will be appeared in Advances in High Energy Physics

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Cited by in corpus (1)

• Thermodynamic phase transition of Anti-de Sitter Reissner-Nordström black holes with exotic Einstein-Maxwell gravities