Deflection Angle and Shadow Behaviors of Quintessential Black Holes in arbitrary Dimensions

Belhaj, A.; Benali, M.; Balali, A. El; Moumni, H. El; Ennadifi, S-E.

doi:10.48550/arxiv.2006.01078

Cited by 18 publications

(35 citation statements)

References 33 publications

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“…More recently, these thermodynamical properties have been combined with optical ones in order to unveil such phase transitions [42]. These optical aspects, concerning the shadow and the deflection angle, have been discussed using different approaches [10,11]. In particular, it has been revealed that the shadows of non-rotating black holes involve a circular geometry [43].…”

Section: Introductionmentioning

confidence: 99%

Black Hole Shadows in M-theory Scenarios

Belhaj,

Benali,

Balali

et al. 2020

Preprint

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We study the shadows of four dimensional black holes in M-theory inspired models. We first inspect the influence of M2-branes on such optical aspects for non-rotating solutions. In particular, we show that the M2-brane number can control the circular shadow size. This geometrical behavior is distorted for rotating solutions exhibiting cardioid shapes in certain moduli space regions. Implementing a rotation parameter, we analyze the geometrical shadow deformations. Among others, we recover the circular behaviors for a large M2-brane number. In addition, we propose a possible connection with observations (from Event Horizon Telescope or future devices) for a particular M-theory compactification by deriving naive constraints on the M2-brane number in the light of the M 87 observational parameters. Investigating the energy emission rate at high energies, we find, in a well-defined approximation, that the associated peak decreases with the M2-brane number.

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Section: Introductionmentioning

confidence: 99%

Black Hole Shadows in M-theory Scenarios

Belhaj,

Benali,

Balali

et al. 2020

Preprint

Self Cite

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“…Increasing where one has used λ = √ 65536M 2 4 − 6π 2 6 + 256M 2 . It has been observed that this behavior changing of the deflection angle, in terms of the charge, appears in the case of the quintessential RN black hole [27]. However, this is removed in the case of RN ordinary black holes.…”

Section: Deflection Angle Behaviors By Reissner-nordström Ads Black H...mentioning

confidence: 96%

“…This optical quantity could unveil certain data which may impose particle physics constraints associated with black hole detections. In particular, many works on such optical aspects have been conducted [24][25][26][27][28]. An inspection shows that this optical quantity has been approached using different methods.…”

Section: Introductionmentioning

confidence: 99%

Deflection Light Behaviors by AdS Black Holes

Belhaj,

Belmahi,

Benali

2021

Preprint

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We investigate the behavior of the deflection of light rays by charged and rotating AdS black holes using the Gauss-Bonnet formalism. Taking weak field approximations and certain appropriate limits associated with AdS geometries, we compute and analyze such an optical quantity by varying the involved moduli space parameters. First, we study the charge and the AdS radius effects on the deflection angle of RN-AdS black holes. For small values of the impact parameter b, we find that the charge effect is relevant. Precisely, it decreases the deflection angle, while the AdS background one is not. For large values of b, however, these optical behaviors have been inverted and the deflection angle becomes an increasing function of the charge. In this way, the cosmological constant effect is remarked to be relevant showing linear variations of the deflection angle. Varying the charge, we find a critical impact parameter value b c where the charge effect is inverted. For rotating solutions, we show that the spinning parameter still decreases the deflection angle without any changing behavior observed in the charge effect. Evincing of the cosmological constant, we recover known results corresponding to charged and rotating ordinary black hole solutions. Examining the plasma effect, we reveal that the deflection angle keeps the same behavior being a decreasing function in terms of the frequency ratio.

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“…In this subsection, we study the effect of the parameters of the theory on the emission of particles around the black hole given by solution (8). It was shown that the black hole shadow corresponds to its high energy absorption cross section for the observer located at infinity [77][78][79]. In fact, at very high energies, the absorption cross-section oscillates around a limiting constant value σ lim which is approximately equal to the area of the photon sphere (σ lim ≈ πr 2 s ).…”

Section: B Energy Emission Ratementioning

confidence: 99%

Optical features of AdS black holes in the novel 4D Einstein-Gauss-Bonnet gravity coupled to nonlinear electrodynamics

Jafarzade,

Zangeneh,

Lobo

2020

Preprint

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An alternative theory of gravity that has attracted much attention recently is the novel fourdimensional Einstein-Gauss-Bonnet (4D EGB) gravity. The theory is rescaled by the Gauss-Bonnet (GB) coupling constant α → α/(D − 4) in D dimensions and redefined as four-dimensional gravity in the limit D → 4. Thus, in this manner, the GB term yields a non-trivial contribution to the gravitational dynamics. In fact, regularized black hole solutions and applications in the novel 4D EGB gravity have also been extensively explored. In this work, motivated by recent astrophysical observations, we present an in-depth study of the optical features of AdS black holes in the novel 4D EGB gravity coupled to exponential nonlinear electrodynamics (NED), such as the shadow geometrical shape, the energy emission rate, the deflection angle and quasinormal modes. Taking into account these dynamic quantities, we investigate the effects on the black hole solution by varying the parameters of the models. More specifically, we show that the variation of the GB and NED parameters, and of the cosmological constant, imprints specific signatures on the optical features of AdS black holes in the novel 4D EGB gravity coupled to nonlinear electrodynamics, thus leading to the possibility of directly testing these black hole models by using astrophysical observations.

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Deflection Angle and Shadow Behaviors of Quintessential Black Holes in arbitrary Dimensions

Cited by 18 publications

References 33 publications

Black Hole Shadows in M-theory Scenarios

Black Hole Shadows in M-theory Scenarios

Deflection Light Behaviors by AdS Black Holes

Optical features of AdS black holes in the novel 4D Einstein-Gauss-Bonnet gravity coupled to nonlinear electrodynamics

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