Akademik Veri Yönetim Sistemi
PHYSICS OF THE DARK UNIVERSE, cilt.51, 2026 (SCI-Expanded, Scopus)
This paper presents a comprehensive analysis of the Joule-Thomson (J-T) expansion and thermodynamic properties of charged AdS black holes (BHs) coupled to nonlinear electrodynamics and embedded within a string cloud with particular emphasis on elucidating the profound role of thermal fluctuations. By formulating the equation of state and analyzing the J-T coefficient, we distinguish the heating and cooling phases of the BH and demonstrate how the mass, string cloud parameter and deviation parameter x influence the transition between them. The isenthalpic curves in the T-P plane reveal that larger BH masses enhance cooling efficiency while nonlinear electrodynamics suppresses it. Incorporating logarithmic corrections due to thermal fluctuations, we study the corrected entropy and various thermodynamic potentials, including the Helmholtz free energy, internal energy, enthalpy, Gibbs free energy and heat capacity. Evidence from the analysis suggests that quantum thermal corrections significantly alter the stability profile of AdS BHs. Configurations of small horizon radius exhibit negative heat capacity, thereby entering an unstable regime, whereas sufficiently large BHs undergo a transition to positive capacity, restoring stability and equilibrium. The radiative spectrum, moreover, is characterized by a pronounced peak at intermediate frequencies, echoing the profile of Hawking emission yet distinctly modified through nonlinear electrodynamic contributions. Collectively, these insights establish that nonlinear electrodynamics, the presence of a string cloud, and quantum fluctuations are fundamental determinants in shaping the phase structure, equilibrium properties, and radiative dynamics of AdS BHs.