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

作　　者：Ashima Sood Md Sabir Ali J.K.Singh Sushant G.Ghosh 

机构地区：[1]Department of Mathematics,Netaji Subhas University of Technology,New Delhi-110078,India [2]Centre for Theoretical Physics,Jamia Millia Islamia,New Delhi 110025,India [3]Department of Physics,Mahishadal Raj College,Purba Medinipur,West Bengal,721628,India [4]Institute of Theoretical Physics&Research Center of Gravitation,Lanzhou University,Lanzhou 730000,China [5]Key Laboratory of Quantum Theory and Applications of MoE,Lanzhou University,Lanzhou 730000,China [6]Lanzhou Center for Theoretical Physics&Key Laboratory of Theoretical Physics of Gansu Province,Lanzhou University,Lanzhou 730000,China [7]Astrophysics and Cosmology Research Unit,School of Mathematics,Statistics and Computer Science,University of KwaZulu-Natal,Private Bag X54001,Durban 4000,South Africa

出　　处：《Chinese Physics C》2024年第6期247-259,共13页中国物理C（英文版）

基　　金：Supported by the National Natural Science Foundation of China(11875151,12347177,12247101);the 111 Project under(B20063);the Lanzhou City's Scientific Research Funding Subsidy to Lanzhou University。

摘　　要：We obtain an exact solution for 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 analyze 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(β),we analyze the Hawking temperature,entropy,and specific heat.Furthermore,we investigate the relationship between the photon sphere radius and phase transition for the Letelier AdS black holes immersed in PFDM.Through the analysis,with a particular condition,non-monotonic behaviors are found between the photon sphere radius,impact parameter,PFDM parameter,temperature,and pressure.We can regard the changes in both the 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,similar to that in ordinary thermal systems.This indicates that a universal relation of gravity may exist near the critical point for a black hole thermodynamic system.

关 键 词：AdS black holes perfect fluid dark matter Letelier spacetime photon orbit extended phase space thermodynamics correlation of photon orbit and thermodynamics 

分 类 号：P145.8[天文地球—天体物理]