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Advances in High Energy Physics
Volume 2019, Article ID 2434390, 6 pages
https://doi.org/10.1155/2019/2434390
Research Article

Perfect Fluid Dark Matter Influence on Thermodynamics and Phase Transition for a Reissner-Nordstrom-Anti-de Sitter Black Hole

Zhaoyi Xu,1,2,3,4 Xian Hou,1,3,4 Jiancheng Wang,1,2,3,4 and Yi Liao5,6

1Yunnan Observatories, Chinese Academy of Sciences, 396 Yangfangwang, Guandu District, Kunming, 650216, China
2University of Chinese Academy of Sciences, Beijing, 100049, China
3Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, 396 Yangfangwang, Guandu District, Kunming, 650216, China
4Center for Astronomical Mega-Science, Chinese Academy of Sciences, 20A Datun Road, Chaoyang District, Beijing, 100012, China
5Department of Physics, National University of Defense Technology, Changsha, 410073, China
6Interdisciplinary Center for Quantum Information, National University of Defense Technology, Changsha, 410073, China

Correspondence should be addressed to Zhaoyi Xu; nc.ca.oany@88uxyz, Xian Hou; moc.liamg@ortsa.uohnaix, and Yi Liao; moc.liamg@iynaitiyoail

Received 5 June 2018; Accepted 23 December 2018; Published 23 January 2019

Guest Editor: Farook Rahaman

Copyright © 2019 Zhaoyi Xu et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. The publication of this article was funded by SCOAP3.

Abstract

Based on Reissner-Nordstrom-anti-de Sitter(RN-AdS) black hole surrounded by perfect fluid dark matter, we study the thermodynamics and phase transition by extending the phase space defined by the charge square and the conjugate quantity , where is a function of horizon radius. The first law of thermodynamics and the equation of state are derived in the form . By investigating the critical behaviour of perfect fluid dark matter around Reissner-Nordstrom-anti-de Sitter black hole, we find that these thermodynamics system are similar to Van der Waals system and can be explained by mean field theory. We also explore the Ruppeiner thermodynamic geometry feature and their connection with microscopic structure. We find that in extended phase space there are existence singularity points of Ruppeiner curvature and they could explained as phase transitions.

1. Introduction

Black hole thermodynamics are one of the most important topics in modern physics research and have been widely studied in recent years. The laws of black hole dynamics and thermodynamics were analyzed by Bekenstein and Hawking [15]. The four laws of black hole thermodynamics have been discussed [6]. Since the Hawking-Page phase transition was discovered, phase transitions have become a important topic in the black hole area. There are lots of work on the phase transition of different black holes, such as Reissner-Nordstrom black hole, Kerr black hole, and Kerr-Newman black hole [710]. These works have also been generalized to other black holes or applied to general situations [1116]. Recently, several studies have considered the cosmological constant as a dynamical variable which is similar to thermodynamical pressure [17]. Utilizing this method, some works have obtained the phase transition in AdS-black hole, in which the analogy between the critical behaviours of the Van der Waals gas and the RN-AdS black hole have been found [1822].

From recent observations, we know that our universe is dominated by Dark Energy and Dark Matter [23, 24]. The dark energy makes the universe to be in accelerated expansion, and its state of equation is very close to the cosmological constant or the vacuum energy [25]. But the dynamics of dark energy are more like quintessence or other dynamical dark energy in behaviour [26]. The dark energy with quintessence could affect the black hole spacetime [27]. For the Schwarzschild black hole in quintessence field, the modified black hole metric has been obtained by Kiselev [28, 29]. Recently the rotational quintessence black hole and Kerr-Newman-AdS black hole solutions have also been obtained [30, 31]. For the Schwarzschild black hole surrounded by quintessence matter, the thermodynamics and phase transition have been discussed in Tharanath et al. [32]; Ghaderi & Malakolkalami [33, 34]. For rotational black hole surrounded by quintessence case, the thermodynamics and phase transition have been studied recently by Xu & Wang [35]. The Rerssner-Nordstrom black hole and Rerssner-Nordstrom-dS black hole have been studied by Ghaderi & Malakolkalami [34]; Wei & Chu [36]; Wei & Ren [37]; Thomas et al. [38]; Mandal & Biswas [39]; Ma et al. [40]; the thermodynamics [41, 42] and phase transition through holography framework for Reissner-Nordstrom-AdS black hole have been investigated [43]. Following these works, the cold dark matter around black hole in phantom field background have been obtained by Li & Yang [44], and references therein. In this paper, we study the thermodynamics and phase transition of Reissner-Nordstrom-AdS black hole surround by perfect fluid dark matter.

This paper focuses on the study of the influence of perfect fluid dark matters on thermodynamics and phase transition for Reissner-Nordstrom-anti-de Sitter black hole. In Section 2, we introduce the Reissner-Nordstrom-anti-de Sitter black hole with perfect fluid dark matter background. In Section 3, we study the thermodynamical features, the equation of state in space, and the critical behaviour. In Section 4, we study the Ruppeiner thermodynamic geometry and their connection with microscopic structure for these black hole systems. We summarize our results in Section 5.

2. The Spacetime of Perfect Fluid Dark Matter around Reissner-Nordstrom-AdS Black Hole

We consider the dark matter field minimally coupled to gravity, electromagnetic field, and cosmological constant [28, 29, 44, 45]:where is the Newton gravity constant, is the cosmological constant, is the Faraday tensor of electromagnetic field, is the dark matter Lagrangian density, and this dark matter can be any dark matter model. By variation, we obtain the field equation from action principle aswhere is the energy-momentum tensors of ordinary matter and is the energy-momentum tensors of dark matter. In the case of black holes surrounded by dark matter, we assume that dark matter is perfect fluid. The energy-momentum tensors can be written as (where ). In addition, for the simpliest case, we assume , where is a constant. We refer to such dark matter as the “perfect fluid dark matter” in this work.

For the Reissner-Nordstrom-AdS spacetime metric in perfect fluid DM, the black hole solution is as follows [28, 29, 44]:wherewhere is a parameter describing the intensity of the perfect fluid DM, is the black hole mass, and is the charge of black hole. This solution corresponds to a specific case of the general solution in Kiselev [28, 29] and Li & Yang [44]. It is interesting to note that this black hole solution implies that the rotational velocity is asymptotically flat in the equatorial plane, which could explain the observed rotation curves in spiral galaxies [28, 29, 44].

3. Thermodynamics of Dark Matter around Reissner-Nordstrom-AdS Black Hole

In Section 2, we have obtained the metric of spherically symmetric Reissner-Nordstom-AdS black hole in perfect fluid dark matter. These black holes have three horizons which are Cauchy horizon , event horizon , and cosmological horizon . In this work, we always use event horizon . The black hole mass can be expressed in event horizon asThe semi-hawking temperature and the entropy are given by

Now we study the thermodynamical properties of the black hole with perfect fluid dark matter by extending to new phase space. This phase space is constructed by the entropy , the perfect fluid dark matter density , the charge square , and the pressure corresponding to the cosmological constant . Therefore the black hole mass can be expressed asThe intensive parameters are defined bywhere denotes the temperature and the new physical quantity is related to the specific volume as , where . In thermodynamical space, the volume is and the quantity . The generalized first law of black hole thermodynamics in this extended phase space is expressed byand the generalized Smarr formula is given byFor the first law of black hole thermodynamics, the term becomes in this phase space, where represents the electric potential. This change leads to the interesting behaviour with in formal phase space. When the perfect fluid dark matter is around black hole, the phase transition of black hole occurs in plane. We can discuss this phase transition in plane, including the critical point, Gibbs free energy, and critical exponents under the effect of perfect fluid dark matter. Through calculations, we obtain the state equation aswhere . The above equation describes the behaviours of for different and .

and also satisfy the Maxwell equal area theorem given by Spallucci & Smailagic [46]:For , where critical temperature, there is an inflection point which is similar to the Van der Waals system. From general method, the coordinates of the critical point are determined by the following:We then obtain the following equations:We then get the equation of critical and asThe universal number is where for perfect fluid dark matter. When , we have the following values:which have been obtained by Dehyadegari et al. [47].

Now we study the critical behaviour near the phase transition with perfect fluid dark matter in new phase space. We first define , , and ; we then get , , and , where and represent the deviations away from critical points. The thermodynamics quantities are defined aswhere and are the critical exponents. The critical exponent is derived by fixing potential for heat capacity asThe critical exponent is derived from aswhere , , , , and the critical points are functions of . In order to obtain critical exponent, we expand the equation near the critical point using , and , and obtainThrough differentiating (22) with respect to and , and using (13), we obtain , where and represent large and small black hole phase, respectively. We then find thatThe critical exponent is derived from isothermal compressibility coefficient asThe critical exponent is obtained from (22) as

From the above analysis, we find that these critical exponents resemble those in Van der Waals system, implying that the critical phenomenon can be explained by mean field theory [17]. These critical exponents satisfy the scale symmetry given by

The perfect fluid dark matters around black holes could explain the formation of supermassive black holes in approximate stationary situation. In the past decades, some high redshift quasars have been discovered and the centre supermassive black hole with the mass beyond 10 billion of solar masses. Usually such black hole is difficult to form in the Universe less than one billion years old. Because perfect fluid dark matter black holes satisfy the first law of thermodynamics, the perfect fluid dark matter could accelerate the formation of supermassive black holes.

4. Geothermodynamics of Dark Matter around Reissner-Nordstrom-AdS Black Hole

In the black hole thermodynamics, the thermodynamic geometry method is a usual tool to understand the property of black hole thermodynamics system. In the work, we use the Ruppeiner metric to study the thermodynamical effect of the perfect fluid dark matter on the microscopical structure of Reissner-Nordstrom-AdS black hole [48]. We define the metric on space given bywhere .

From (5) and (6), we find that and in space are given by

From geometry, the Ricci scalar can be calculated for perfect fluid dark matter around Reissner-Nordstrom-AdS black holes bywhere are function of and . From above equation, we find that the phase transition occurs when the following condition is satisfied:

We know that the sign of the Ricci scalar can be explained by intermolecular interaction in thermodynamical system. The positive sign refers to the repulsive interaction between the constituents of the thermodynamical system, while the negative sign refers to the attractive interaction between the constituents of the thermodynamical system ([42] and references therein). For perfect fluid dark matter around Reissner-Nordstrom-AdS black hole, the interactions are absent in the thermodynamical system for a null Ricci scalar , which is similar to that in classical ideal gas [49].

5. Summary

In the paper, we study the perfect fluid dark matter influence on thermodynamics and phase transition of Reissner-Nordstrom-AdS black hole by extending phase space defined by the charge square and conjugate quantity . The first law of thermodynamics and the equation of state are derived in the form of . We analyze the critical behaviour of dark matter around Reissner-Nordstrom-AdS black hole and find that these thermodynamics system resemble the Van der Waals system which can be explained by mean field theory. We also find that the critical exponents satisfy the scale law of thermodynamical system. Using Ruppeiner thermodynamic geometry, we study the geometric property of perfect fluid dark matter around black holes. We find that, in extended phase space, some singular points appear on the Ruppeiner curvature, which can be explained as the critical points of phase transitions.

The Reissner-Nordstrom-AdS black hole surrounded by dark matters could appear in the Universe. In the future work we plan to study the observed effects of perfect fluid dark matter on black holes and the influence of perfect fluid dark matter on gravitational lensing and the evolution of dark matter in the universe.

Data Availability

No data were used to support this study.

Conflicts of Interest

The authors declare that they have no conflicts of interest.

Acknowledgments

The authors acknowledge the financial support from the National Natural Science Foundation of China, 11573060 and 11661161010.

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