Thermodynamics of AdS black holes from deflection angle formalism

Belhaj, A.; Belmahi, H.; Benali, M.; Seguí, A.

doi:10.1016/j.physletb.2021.136313

Cited by 26 publications

(14 citation statements)

References 28 publications

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“…It has been shown that the study of such a transition unveil certain universalities reported in [8,9]. Parallelly to these efforts, optical behaviors have been investigated by considering the deflection angle of lights and the shadow geometry [10][11][12][13][14][15][16]. Concretely, the black hole shadow behaviors have been examined in different theories including M-theory and superstring theory in the presence of D-brane objects [17,18].…”

Section: Introductionmentioning

confidence: 99%

Superentropic AdS Black Hole Shadows

Belhaj,

Belmahi,

Benali

2021

Preprint

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We study shadow aspects of superentropic black holes in four dimensions. Using Hamilton-Jacobi formalism, we first get the null geodesic equations. In the celestial coordinate framework relying on fixed positions of observers, we investigate the shadow behaviors in terms of the mass and the cosmological scale variation parameters. Among others, we obtain ellipse shaped geometries contrary to usual black hole solutions. Modifying the ordinary relations describing geometrical observables, we discuss the size and the shape deformation parameters of these non-trivial geometric forms. Due to horizonless limits associated with certain mass values, we explore the shadow of the naked singularity of such black holes.

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Section: Introductionmentioning

confidence: 99%

Superentropic AdS Black Hole Shadows

Belhaj,

Belmahi,

Benali

2021

Preprint

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“…These activities have been supported by considerable efforts of Event Horizon Telescope collaborations providing an interesting picture of supermassive black holes at the center of galaxy M 87 [25,26]. Several works have been elaborated dealing with such optical behaviors by approaching the shadow geometry and the deflection angle [27,28]. In particular, the black hole shadow behaviors of various black holes have been examined [29,30].…”

Section: Introductionmentioning

confidence: 99%

Optical Shadows of Rotating Bardeen AdS Black Holes

Belhaj,

Belmahi,

Benali

et al. 2022

Preprint

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Using the Hamilton-Jacobi method, we study certain optical shadows of rotating Bardeen-AdS black holes in the presence of internal and external field contributions. Precisely, we examine the shadow using one-dimensional real curves. By establishing the equations of motion of such AdS black holes without external dark sectors, we first analyze the shadow configurations in terms of a reduced moduli space involving only internal parameter contributions including the charge of the nonlinear electrodynamics. Among others, we find that this parameter serves as a geometric quantity controlling the shadow shape. Then, we graphically discuss the associated astronomical observables. Enlarging the moduli space, we analyze the behaviors of the quintessential black hole solutions in terms of the involved parameters controlling the dark field sector. Concretely, we observe that the dark energy not only affects the size but also deforms the shadow shape. Finally, we provide a possible link with observations from Event Horizon Telescope by showing certain constraints on the involved moduli space in the light of the M87 * picture.

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“…Precisely, Even Horizon Telescope (EHT) has provided an image of a black hole [1][2][3][4]. This discovery has been followed by significant efforts reserved to the investigation of various black hole aspects [5,6]. These involve the thermodynamics and the optical behaviors encoding many interesting data of the associated physics.…”

Section: Introductionmentioning

confidence: 99%

Light Deflection by Rotating Regular Black Holes with a Cosmological Constant

Belhaj¹,

H.²,

Benali³

et al. 2022

Preprint

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Using the Gauss-Bonnet theorem, we compute and examine the deflection angle of light rays by rotating regular black holes with a cosmological constant. By the help of optical geometries, we first deal with the Hayward black holes with cosmological contributions. Then, we reconsider the study of the Bardeen solutions. We inspect the cosmological constant effect on the deflection angle of light rays. Concretely, we find extra cosmological correction terms generalizing certain obtained findings. Using graphical analysis, we provide a comparative discussion with respect to the Kerr solutions. The results confirm that the non-linear electrodynamic charges affect the space-time geometry by decreasing the deflection angle of light rays by such cosmological black holes.

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Thermodynamics of AdS black holes from deflection angle formalism

Cited by 26 publications

References 28 publications

Superentropic AdS Black Hole Shadows

Superentropic AdS Black Hole Shadows

Optical Shadows of Rotating Bardeen AdS Black Holes

Light Deflection by Rotating Regular Black Holes with a Cosmological Constant

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