Born-Infeld AdS Black Holes Surrounded by Perfect Fluid Dark Matter

TL;DR

This paper derives exact charged AdS black hole solutions incorporating Born-Infeld nonlinear electrodynamics and perfect fluid dark matter, analyzing their thermodynamics, stability, phase transitions, heat engine efficiency, and geodesic structure.

Contribution

It introduces new exact solutions for charged AdS black holes with PFDM and BI effects, and thoroughly studies their thermodynamic and orbital properties.

Findings

PFDM and BI parameters influence event horizon size.

Black holes exhibit second order phase transitions.

PFDM significantly alters geodesic stability and orbits.

Abstract

We obtain exact charged AdS black hole solutions in Einstein Lambda gravity including the effects of Born Infeld nonlinear electrodynamics and Perfect Fluid Dark Matter. The influence of the PFDM and BI parameters on the event horizon is analyzed. We compute the conserved and thermodynamic quantities and verify that they satisfy the first law of thermodynamics. Thermal stability is studied in the canonical ensemble using the heat capacity and Helmholtz free energy showing how PFDM and BI parameters affect local and global stability regions. We further investigate the thermodynamics in the extended phase space by treating the cosmological constant as thermodynamic pressure obtaining consistent conserved quantities and confirming the first law. The Ehrenfest equations are analytically verified demonstrating that the critical behavior corresponds to a second order phase transition. Heat engines associated with these black holes are also constructed to examine how PFDM and BI parameters influence their efficiency. Finally we analyze the geodesic structure through timelike and null trajectories using the effective potential determining conditions for stable and unstable circular orbits the innermost stable circular orbit and the photon sphere. PFDM significantly modifies the orbital structure while BI corrections are weaker.