Black holes surrounded by modified Chaplygin gas in Lovelock theory of gravity

Li, Xiangqian; Chen, Bo; Xing, Lili

doi:10.1016/j.aop.2022.169125

Cited by 12 publications

(5 citation statements)

References 37 publications

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“…To accurately determine the expression for energy density, we provide the metric function in equation and consider applying conservation conditions to the energy momentum tensor. This consideration yields an intriguing result, such as [53,57]…”

Section: Thermodynamics Of Charged Ads Black Holes Surrounded By Mcgmentioning

confidence: 97%

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Critical behavior and Joule-Thomson expansion of charged AdS black holes surrounded by exotic fluid with modified Chaplygin equation of state*

Zhang 张,

Chen 陈,

Hassanabad

et al. 2024

Chinese Phys. C

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By considering the concept of a unified single fluid model, referred to as modified Chaplygin gas (MCG), which amalgamates dark energy and dark matter, we explore the thermodynamic characteristics of charged anti-de Sitter (AdS) black holes existing in an unconventional fluid accompanied by MCG. To accomplish this objective, we derive the equations of state by regarding the charge as a thermodynamic variable. The effects of MCG parameters on the critical thermodynamic quantities ( , , ) are examined, followed by a detailed analysis of the diagram. To provide a clearer explanation of the phase transition, we present an analysis of the Gibbs free energy. It is important to note that if the Hawking temperature exceeds the critical temperature, a distinct pattern is observed known as swallowtail behavior. This indicates that the system undergoes a first-order phase transition from a smaller black hole to a larger one. The critical exponent of the system is found to be in complete agreement with that of the van der Waals fluid system. Furthermore, we investigate the impact of MCG parameters and black hole charge on Joule-Thomson (J-T) expansion in the extended phase space. The J-T coefficient is examined to pinpoint the exact region experiencing cooling or heating, and the observation reveals that the presence of negative heat capacity results in the occurrence of a cooling process. The impact of MCG on the inversion curve of charged black holes exhibits a striking resemblance to that observed in most multi-dimensional black hole systems. In addition, it is worth noting that certain parameters exert a significant influence on the ratio . For specific values of the MCG parameters, the ratio is consistent with the charged AdS black hole. The parameters γ and β have a non-negligible effect on the isenthalpic curve.

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Section: Thermodynamics Of Charged Ads Black Holes Surrounded By Mcgmentioning

confidence: 97%

“…The effect of Chaplygin-like fluids on black hole spacetime was first considered in reference [52]. Subsequently, such a model was extended to modified CG (MCG) [53,54]. The thermodynamic phase transition behavior [55] and shadows [56] of black holes in Chaplygin-like dark fluid have also been discussed.…”

Section: Introductionmentioning

confidence: 99%

Critical behavior and Joule-Thomson expansion of charged AdS black holes surrounded by exotic fluid with modified Chaplygin equation of state*

Zhang 张,

Chen 陈,

Hassanabad

et al. 2024

Chinese Phys. C

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“…Thus, describing the equations of state of dark energy in an expanding universe background and in a curved BH spacetime may have a non-trivial relationship. In the literatures studying BHs immersed in cosmological dark fluids, researchers directly introduce linear [62] or nonlinear [77][78][79][80] equations of state in the curved BH spacetime, rather than in the spatially flat universe spacetime. This is why, in our study, we refer to the dark fluid involved as Chaplygin-like dark fluid, rather than Chaplygin gas, which have already been introduced in FLRW spacetime to illustrate the evolution of our universe.…”

Section: Jcap05(2024)048mentioning

confidence: 99%

“…Recently, we obtained an analytical solution and investigated associated thermodynamic quantities for a charged static spherically-symmetric black hole surrounded by Chaplygin-like dark fluid (CDF) within the framework of Lovelock gravity theory [77]. This model has been subsequently extended to incorporate the modified Chaplygin gas (MCG), with equation of state p = Aρ − B ρ β , to explore stability aspects of MCG-surrounded black holes in Einstein-Gauss-Bonnet [78] and Lovelock [79] gravity theories. The investigation in ref.…”

Section: Introductionmentioning

confidence: 99%

Geodesic structure, shadow and optical appearance of black hole immersed in Chaplygin-like dark fluid

Li,

Yan,

Yue

et al. 2024

J. Cosmol. Astropart. Phys.

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In this study, we focus on a black hole immersed in a cosmological Chaplygin-like dark fluid (CDF), characterized by the equation of state p = -B/ρ and an additional parameter q influencing the energy density of the fluid. We investigate the geodesic structure, shadow, and optical appearance of such a black hole. Through analysis on the effective potential and the epicyclic frequencies, it is found that the existence of innermost/outermost stable circular orbits for a timelike particle is governed by the CDF parameters. The behaviors of the orbital conserved quantities and Keplerian frequency are also examined. Due to the existence of pseudo-cosmological horizon, the determination of the shadow radius depends significantly on the position of the observer. By placing the static observer at an approximately flat position between the event and pseudo-cosmological horizons, we constrain the CDF parameters using EHT observations. We investigate the effect of CDF on the shadows and optical images of the black hole, surrounded by various profiles of accretions. For the thin disk accretion, the light trajectories are categorized into direct emission, lensing ring, and photon ring based on impact parameters. Due to the existence of outermost stable circular orbits, outer edges could exist in the direct and lensing ring images. The observed brightness is mainly due to direct emission, with a minor contribution from the lensing ring, while the contribution from the photon ring is negligible due to extreme demagnetization. In the case of spherical accretion, we consider both static and infalling accretion models. The images obtained under infalling accretion are slightly darker than those under static accretion, attributed to the Doppler effect. Throughout the study, we analyze the influence of the parameters B and q on the results.

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“…Lovelock gravity [1] represents a generalization of Einstein's theory of general relativity to higher dimensions within the realm of higher curvature gravity theories. Several aspects of Lovelock theories in general dimensions are studied in [2,3,4,5,6], particularly, the thermodynamic properties of the Lovelock black hole [7,8,9,10,11,12]. The articles [13,14,15] focused on investigating the third-order Lovelock gravity with black holes.…”

Section: Introductionmentioning

confidence: 99%