Shadow thermodynamics of an AdS black hole in regular spacetime *

Guo, Sen; Li, Guan-Ru; Li, Guoping

doi:10.1088/1674-1137/ac6dc8

Cited by 17 publications

(7 citation statements)

References 26 publications

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“…It can be found that when the shadow radius is smaller than a certain value, the temperature increases from the center to the boundary of the shadow. Then, the temperature oscillates as the shadow radius increases, i.e., the N-type change trend [68]. Figs.…”

Section: Thermal Profile Of the Hayward-ads Bhmentioning

confidence: 95%

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Shadow thermodynamics of the Hayward-AdS black hole

Zhi¹,

Yu²,

Cao³

et al. 2023

Preprint

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In this paper, the phase structure of the Hayward-AdS black hole (BH) is studied using shadow formalism. It has been found that the shadow radius is a monotonic function of the horizon radius and can therefore play an equivalent role to the horizon radius in characterizing the thermodynamics of Hayward-AdS BH. The thermodynamic phase transition (PT) of the Hayward-AdS BH is investigated with the shadow radius. It is shown that as the magnetic charge increases, the shadow radius becomes larger, while the coexistence temperature becomes lower. The thermal profile of the Hayward-AdS BH is established by combining the temperature diagram and the shadow cast diagram, which shows that for a fixed magnetic charge, the temperature of the Hayward-AdS BH increases with the pressure while the region of the thermal profile decreases with the pressure. In particular, the temperature of the Hayward-AdS BH follows an N-type change trend when it is smaller than the critical temperature. This imply that the BH shadow may be used to investigate the thermodynamics of the Hayward-AdS BH.

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Section: Thermal Profile Of the Hayward-ads Bhmentioning

confidence: 95%

“…[65]. Fairly recently, the microstructure states and thermal profiles of different kinds of AdS BHs were studied using shadow formalism [66][67][68][69]. Given the significance of BH thermodynamics and inspired by these pioneering works, we study the thermodynamics of the Hayward-AdS BH with the shadow.…”

Section: Introductionmentioning

confidence: 99%

Shadow thermodynamics of the Hayward-AdS black hole

Zhi¹,

Yu²,

Cao³

et al. 2023

Preprint

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“…Besides Q e and Φ H , the other macroscopic parameters of the Hayward class BHs are given as follows, (ii) Bardeen-AdS class BHs [10,40]. One can introduce a negative cosmological constant Λ into the action for the Bardeen class BHs, yielding…”

Section: Jcap03(2024)053mentioning

confidence: 99%

Thermodynamics for regular black holes as intermediate thermodynamic states and quasinormal frequencies

Huang,

Hu,

Zhao

2024

J. Cosmol. Astropart. Phys.

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The thermodynamics for regular black holes (RBHs) is considered under the restricted phase space (RPS) formalism. It is shown that the RPS formalism seems to hold for RBHs, however, in order for the extensive thermodynamic parameters to be independent from each other, the RBHs need to be viewed as intermediate thermodynamic states in a larger class of black holes (BHs) which admit both regular and singular states. This idea is checked for several classes of BHs. In particular, for the electrically charged Hayward class BHs, it is shown that the regular states can either be thermodynamically stable or unstable, depending on the amount of charges carried by the BHs. The quasinormal frequencies for the Hayward class BHs are also analyzed, and it turns out that, even for the thermodynamically unstable regular states, the dynamic stability still holds, at least under massless scalar perturbations.

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“…In particular, it has been shown that the black hole shadows could provide correct information concerning the small/large black hole phase structure and the involved microstructure [41]. It has been shown that the relation between the shadows and the thermodynamics of the black hole has been also developed for regular space-times [42]. Using the elliptic function analysis, it has been explored further a fundamental connection between the AdS black hole thermodynamics and the deflection angle of the light rays.…”

Section: Jcap11(2023)094mentioning

confidence: 99%

Light trajectories and thermal shadows casted by black holes in a cavity

Belhaj,

Belmahi,

Benali

et al. 2023

J. Cosmol. Astropart. Phys.

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We explore the shadows and the photon rings casted by black holes in cavity. Placing the observer inside such an isothermal background, we examine the influence of the cavity temperature T cav and the charge Q on the involved optical features. After studying the effect of the horizon radius by varying Q, we investigate the thermal behaviors of the black hole shadows in a cavity. For fixed charge values, we find that the shadow radius r s increases by decreasing T cav. Varying such a temperature, we discuss the associated energy emission rate. After that, we show that the curves in the r s-T cav plane share similarities with the G-T curves of the Anti de Sitter black holes. Then, we study the trajectories of the light rays casted by black holes in a cavity. We further observe that the light trajectory behaviors are different than the ones of the non rotating black holes due to the cavity effect. Finally, we provide an evidence for the existence of an universal ratio defined in terms of the photon sphere radius and the impact parameter. Concretely, we obtain an optical ratio b sp/r sp∼√(3).

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Shadow thermodynamics of an AdS black hole in regular spacetime *

Cited by 17 publications

References 26 publications

Shadow thermodynamics of the Hayward-AdS black hole

Shadow thermodynamics of the Hayward-AdS black hole

Thermodynamics for regular black holes as intermediate thermodynamic states and quasinormal frequencies

Light trajectories and thermal shadows casted by black holes in a cavity

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