Journal
INTERNATIONAL JOURNAL OF MODERN PHYSICS D
Volume 27, Issue 7, Pages -Publisher
WORLD SCIENTIFIC PUBL CO PTE LTD
DOI: 10.1142/S0218271818500694
Keywords
Rastall gravity; black hole thermodynamics; phase transition
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Funding
- Conselho Nacional de Desenvolvimento Cientifico e Tecnologico (CNPq-Brazil) [150384/2017-3]
- Research Institute for Astronomy & Astrophysics of Maragha (RIAAM) [1/5237-6]
- CAPES (Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior)
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A promising theory in modifying general relativity (GR) by violating the ordinary energy-momentum conservation law in curved spacetime is the Rastall theory of gravity. In this theory, geometry and matter fields are coupled to each other in a nonminimal way. Here, we study thermodynamic properties of some black hole (BH) solutions in this framework, and compare our results with those of GR. We demonstrate how the presence of these matter sources amplifies the effects caused by the Rastall parameter in thermodynamic quantities. Our investigation also shews that BHs with radius smaller than a certain amount (equivalent to r(0)) have negative heat capacity in the Rastall framework. In fact, it is a lower bound for the possible values of horizon radius satisfied by the stable BHs.
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