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Joule–Thomson expansion of RN-AdS black hole immersed in perfect fluid dark matter

Communications in Theoretical Physics 2021年第9期73卷 105-112页

作者： Yihe Cao Hanwen Feng Wei Hong Jun Tao Center for Theoretical Physics College of PhysicsSichuan UniversityChengdu610065China

In this paper,we study the Joule–Thomson expansion for RN-AdS black holes immersed in perfect fluid dark *** perfect fluid dark matter is one of the dark matter candidates,we are interested in how it influences the thermodynamic properties of black ***,the negative cosmological constant could be interpreted as thermodynamic pressure and its conjugate quantity as the thermodynamic volume,which give us more physical insights into the black ***,we derive the thermodynamic definitions and study the critical behaviour of the black ***,the explicit expression of Joule–Thomson coefficient is obtained from the basic formulas of the pressure,the volume,the entropy and the ***,we obtain the inversion curves in terms of charge Q and parameterλ.Furthermore,we analyse the isenthalpic curve in T–P graph with the cooling–heating region determined by the inversion *** last,we derive the ratio of minimum inversion temperature to critical temperature and compare the result with that in the RN-AdS case.

关键词： Joule-Thomson expansion black hole perfect fluid dark matter

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

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Chinese Physics C 2024年第6期48卷 247-259页

作者： Ashima Sood Md Sabir Ali J.K.Singh Sushant G.Ghosh Department of Mathematics Netaji Subhas University of TechnologyNew Delhi-110078India Centre for Theoretical Physics Jamia Millia IslamiaNew Delhi 110025India Department of Physics Mahishadal Raj CollegePurba MedinipurWest Bengal721628India Institute of Theoretical Physics&Research Center of Gravitation Lanzhou UniversityLanzhou 730000China Key Laboratory of Quantum Theory and Applications of MoE Lanzhou UniversityLanzhou 730000China Lanzhou Center for Theoretical Physics&Key Laboratory of Theoretical Physics of Gansu Province Lanzhou UniversityLanzhou 730000China Astrophysics and Cosmology Research Unit School of MathematicsStatistics and Computer ScienceUniversity of KwaZulu-NatalPrivate Bag X54001Durban 4000South Africa

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 *** to the background clouds of strings parameter(a)and the parameter endowed with PFDM(β),we analyze the Hawking temperature,entropy,and specific ***,we investigate the relationship between the photon sphere radius and phase transition for the Letelier AdS black holes immersed in *** the analysis,with a particular condition,non-monotonic behaviors are found between the photon sphere radius,impact parameter,PFDM parameter,temperature,and *** 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 *** 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

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