Joule-Thomson effect and Efficiency of deformed AdS-Schwarzschild black hole in presence of quintessence

Abstract

We study the Joule-Thomson expansion and extended thermodynamics of a modified black hole characterised by the parameters $\alpha$, $\beta$, and $\sigma$. Analysis of the Hawking temperature, Joule-Thomson coefficient, inversion curves, and isenthalpic trajectories shows that these parameters significantly modify the heating-cooling behaviour and thermal stability of the system. The deformation parameter $\alpha$ and control parameter $\beta$ shift the temperature minimum, enlarge the cooling region, and raise the inversion temperature, while $\sigma$ produces a weaker but consistent influence. The heat-engine analysis reveals that $\alpha$ enhances efficiency, whereas higher $\beta$ and $\sigma$ reduce it. Overall, the results demonstrate that geometric deformation and quintessence jointly govern the unified thermodynamic structure of the black hole.

17 pages, accepted for publication at EPJC