arXiv subjects

Ahmed. Daassou

Publications and source records attributed to Ahmed. Daassou.

3 recordsLinked to original sources

arXiv2024

Phase diagrams of a nonlinear magnetic charged rotating AdS black hole with a quintessence field

In this paper, we investigate the phase transitions and critical behavior of a nonlinear magnetically charged rotating AdS black hole, with a particular emphasis on the influence of a quintessence field. Our comprehensive thermodynamic analysis explores the impact of thermal fluctuations on the black hole's properties. We observe that for larger black holes, the corrected entropy remains positive, similar to the uncorrected case, which highlights the significant role of thermal fluctuations in modifying the entropy of smaller black holes. Through a meticulous analysis of various thermodynamic properties, we derive explicit analytical expressions for the critical points. Our findings demonstrate that the quintessence field significantly affects phase transitions, resulting in distinct critical phenomena. Notably, the black hole's phase transitions exhibit striking similarities to those observed in van der Waals fluids, offering deeper insights into the complex thermodynamic behavior of these systems across different scales.

hep-th↗

arXiv2024

Analytical Critical Phenomena of Rotating Regular AdS Black Holes with Dark Energy

This study focuses on precisely calculating analytical critical points for rotating regular AdS black holes, examining scenarios with and without external dark field contributions. Importantly, it represents the first attempt to compute critical points for this specific class of rotating black holes. Our primary focus is on investigating the impact resulting from variations in the charge of nonlinear electrodynamics on the critical phenomena of rotating regular AdS black holes, while also incorporating the influence of quintessence field contributions. The analytical investigation is concentrated on the horizon radius, employing two distinct approaches to simplify the complexity and length of the calculations. Furthermore, our examination extends to deciphering the intricate relationship between dark energy and critical phenomena. This involves visually portraying a range of critical behaviors and detailing a recent discovery regarding how the intensity of quintessence affects phase transitions. The shift in these transitions conform to either a concave or convex function, a characteristic dependent on the sign of quintessence intensity.

hep-th↗

arXiv2024

Thermodynamic features of AdS black holes within the Rastall gravity and perfect fluid matter framework

In this study, we analyzed the impact of a perfect fluid on the phase transition of Anti-de Sitter (AdS) black holes within the Rastall gravitational background. Compared to similar studies in the literature, the findings of this work are highlighted by the determination of analytical expressions for critical points for charged and Kerr-Newman AdS black holes using approximated formulas for the horizon radius. An accurate analysis of these new analytical expressions allowed us to discover a new viable condition that relates the Rastall parameter \k{appa}λ to the equation of state parameter ω, expressed as: \k{appa}λ = ω/(1+ω). Thanks to this new condition, we were able to reproduce all the analytical expressions of critical points calculated within the framework of Einsteinâs general relativity for two cases: a charged AdS black hole and a rotating AdS black hole. These findings suggest that Rastall gravity, considering this new condition, could serve as an alternative theory of gravitation to general relativity. The approximate expression of the horizon radius also enabled the exploration of the distinctiveness of fractional-order phase transitions in these AdS black holes. Furthermore, we calculated the critical exponents, offering insights into the behavior of crucial thermodynamic quantities near the inflection point. Examining how a perfect fluid influences phase transition reveals various critical behaviors, demonstrating that the variation in the phase transition depends on the intensity of the perfect fluid. Notably, this variation is portrayed by a linearly increasing trajectory with the escalation of this intensity.

hep-th↗