Photon orbits and phase transition for Letelier AdS black holes immersed in perfect fluid dark matter

Abstract

We obtain an exact solution of spherically symmetric Letelier AdS black holes immersed in perfect fluid dark matter (PFDM). Considering the cosmological constant as the positive pressure of the system and volume as its conjugate variable, we analyse the thermodynamics of our black holes in the extended phase space. Owing to the background clouds of strings parameter ($a$) and the parameter endowed with PFDM ($\beta$), we analyse the Hawking temperature, entropy and specific heat. We also investigate the relationship between the photon sphere radius and the phase transition for the Letelier AdS black holes immersed in PFDM. Through the analysis, we find with a particular condition, there are non-monotonic behaviours between the photon sphere radius, the impact parameter, the PFDM parameter, temperature, and pressure. We can regard both the changes of photon sphere radius and impact parameter before and after phase transition as the order parameter; their critical exponents near the critical point are equal to the same value 1/2, just like ordinary thermal systems. These indicate that a universal relation of gravity may exist near the critical point for a black hole thermodynamic system.

17 pages, 14 figures, Accepted for Publication in Chinese Physics C

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Cited by in corpus (4)

• Euler-Heisenberg black hole surrounded by quintessence in the background of perfect fluid dark matter: Thermodynamics, Shadows and Quasinormal modes
• Schwarzschild black hole surrounded by a cloud of strings in the background of perfect fluid dark matter
• Photon orbits and phase transition for gravitational decoupled Kerr anti-de Sitter black holes
• Born-Infeld AdS Black Holes Surrounded by Perfect Fluid Dark Matter