Joule-Thomson expansion with Barrow entropy and particle dynamics of charged Rastall-AdS black hole
Faisal Javed, M. Zeeshan Gul, Orhan Dönmez, Tayyab Naseer, Mansoor H. Alshehri
Abstract
In this study, we are interested in exploring the impact of Barrow entropy on Joule-Thomson expansion of Rastal charged-AdS black hole and then we explore the particle dynamics. We examine the manner in which the characteristics of inversion curves and the Joule-Thomson coefficient behave under different physical conditions. We find that for smaller black holes, the Joule-Thomson coefficients are positive, shifting to negative values as charge grows, and that the coefficients increase as the Rastall parameter becomes positive. The inversion temperature likewise rises with increasing Rastall parameter. The behavior of inversion temperature and Joule-Thomson coefficient decreases as the Barrow entropy parameter approaches 1. The intricate link between the black hole mass and charge is revealed by the isenthalpic curves, which show bigger peaks for larger masses and a drop with decreasing mass values and a negative larger Rastall parameter. It is found that the Barrow entropy parameter greatly affects the heating and cooling regions of Rastal charged-AdS black hole. Further, we investigate that the larger Rastall parameter yields greater positive potential values, and the effective potential also shows a declining tendency as mass increases. We also study test particle dynamics around the charged-AdS black holes, seeing a change in the innermost stable circular orbit radius as charge increases and a clear periodic pattern when particles interact with the gravitational field's fixed points. This study advances the comprehension of black hole phenomena within modified gravity theories and establishes a basis for further investigating their complex behaviors in astrophysical settings.