Thermodynamic Topology of Kiselev-AdS Black Holes within f (R, T) gravity
arXiv:2410.02262 · doi:10.1088/1674-1137/ada379
Abstract
In this paper, we investigate the topological charge and the conditions for the existence of the photon sphere (PS) in Kiselev-AdS black holes within \(f(R, T)\) gravity. We employ two different methods based on Duan's topological current \(ϕ\)-mapping theory viz analize of temperature and the generalized Helmholtz free energy methods to study the topological classes of our black hole. By considering the mentioned black hole, we discuss the critical and zero points (topological charges and topological numbers) for different parameters. Our findings reveal that the Kiselev parameter \(ω\) and the \(f(R, T)\) gravity parameter \(γ\) influence the number of topological charges of black holes, leading to novel insights into topological classifications. We observe that for given values of the free parameters, there exist total topological charges (\(Q_{total} = -1\)) for T-method and total topological numbers (\(W = +1\)) for the generalized Helmholtz free energy method. Our research findings elucidate that, in contrast to the scenario where \(ω= 1/3\), in other cases, increasing the parameter \(γ\) increases the number of total topological charges for the black hole. Interestingly, for the phantom field (\(ω= -4/3\)), we observed that decreasing the parameter \(γ\) increases the number of topological charges. Additionally, we study the results for the photon sphere. The studied models clearly reveal that the simultaneous presence of \(γ\) and \(ω\) effectively expands the permissible range for \(γ\). In other words, the model can exhibit black hole behavior over a larger domain. Additionally, it is evident that with the stepwise reduction of \(ω\), the region covered by singularity also diminishes and becomes more restricted. However, An interesting point about all three ranges is the elimination of the forbidden region in this model.
arXiv comment21 pages, 13 figures, 4 table
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