Shadows and gravitational weak lensing by the Schwarzschild black hole in the string cloud background with quintessential field*

Mustafa, G.; Atamurotov, Farruh; Hussain, Ibrar; Shaymatov, Sanjar; Овгун, Али

doi:10.1088/1674-1137/ac917f

“…Furthermore, finite-distance deflection angles have been investigated by other authors (Arakida 2018;Crisnejo et al 2019b;Haroon et al 2019;Li & Jia 2020;Li & Ovgun 2020). Gravitational lensing effects induced by various BHs have been studied numerically and analytically in the strong field limit as well as weak field limit (Zhao & Xie 2016;Pang & Jia 2019;Mustafa et al 2022;Qiao & Zhou 2022). investigated gravitational lensing by rotating a Simpson-Visser BH in the strong field limit.…”

Section: Introductionmentioning

confidence: 99%

Gravitational Lensing of Acoustic Charged Black Holes

Molla

¹

,

Debnath

²

2023

ApJ

5

0

2

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We study the gravitational lensing of acoustic charged black holes in strong and weak field limit approximations. For this purpose, we first numerically obtain the deflection limit coefficients and deflection angle in the strong field limit. We observe that the strong deflection angle α D increases with increasing magnitude of the charged parameter Q and that the strong deflection angle α D of an acoustic charged black hole with tuning parameter ξ = 4 is greater than that of a standard Reissner–Nordström black hole (ξ = 0). We also study the astrophysical consequences via strong gravitational lensing by taking the example of various supermassive black holes in the center of several galaxies and observe that the acoustic charged black hole could be quantitatively distinguished from standard Reissner–Nordström (ξ = 0) and standard Schwarzschild (ξ = 0, Q = 0) black holes. Furthermore, by using the Gauss–Bonnet theorem, we derive the weak deflection angle in the background of an acoustic charged black hole in the curved spacetime. We find that, for fixed values of the charged parameter Q and the tuning parameter (ξ = 0 or 4), the weak deflection angle σ D decreases with the impact parameter b. We also observe that the weak deflection angle σ D decreases with increasing magnitude of the charged parameter Q for a fixed value of the tuning parameter (ξ = 0 or 4). Our results suggest that the observational test for an acoustic charged black hole is indeed feasible, and it is generalized to the cases of acoustic Schwarzschild (Q = 0), standard Reissner–Nordström (ξ = 0), and standard Schwarzschild (ξ = 0, Q = 0) black holes.

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“…Using Eqs. ( 38), (37), and (40), we can obtain an equation for the deflection angle of light rays (photon) around the black hole in black-bounce spacetime surrounded by uniform plasma:…”

Section: Presence Of Plasmamentioning

confidence: 99%

Photon motion and weak gravitational lensing in black-bounce spacetime*

Sarikulov,

Atamurotov,

Abdujabbarov

et al. 2023

Self Cite

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The effect of spacetime curvature on photon motion may give an opportunity to propose new tests on gravity theories. In this work, we have investigated and focus on the massless (photon) particle motion around black-bounce gravity. We have analyzed the horizon structure around the gravitational compact object described by black-bounce spacetime. The photon motion and the effect of gravitational weak lensing in the vacuum and in the plasma have been discussed. The shadow radius of the compact object has been also studied in the black-bounce spacetime. Additionally, the magnification of the image is studied using the deflection angle of light rays.

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“…It would take more years, or even more sophisticated equipment, to probe other theories of gravity using the black hole. Ever since many authors have considered exploring the behavior of the classical shadow silhouette for black holes [15,18] described by either a toy model metric or through an alternative theory of gravity [19][20][21][22][23][24][25][26][27][28][29][30][31][32][33][34][35][36].…”

Section: Introductionmentioning

confidence: 99%

Testing symmergent gravity through the shadow image and weak field photon deflection by a rotating black hole using the M87$$^$$ and Sgr. $$\hbox {A}^$$ results

Pantig

¹

,

Овгун²,

Demir

³

2023

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In this paper, we study rotating black holes in symmergent gravity, and use deviations from the Kerr black hole to constrain the parameters of the symmergent gravity. Symmergent gravity induces the gravitational constant G and quadratic curvature coefficient $$c_{\textrm{O}}$$ c O from the flat spacetime matter loops. In the limit in which all fields are degenerate in mass, the vacuum energy $$V_{\textrm{O}}$$ V O can be wholly expressed in terms of G and $$c_{\textrm{O}}$$ c O . We parametrize deviation from this degenerate limit by a parameter $${\hat{\alpha }}$$ α ^ such that the black hole spacetime is dS for $${\hat{\alpha }} < 1$$ α ^ < 1 and AdS for $${\hat{\alpha }} > 1$$ α ^ > 1 . In constraining the symmergent parameters $$c_{\textrm{O}}$$ c O and $${\hat{\alpha }}$$ α ^ , we utilize the EHT observations on the M87* and Sgr. A* black holes. We investigate first the modifications in the photon sphere and shadow size, and find significant deviations in the photonsphere radius and the shadow radius with respect to the Kerr solution. We also find that the geodesics of time-like particles are more sensitive to symmergent gravity effects than the null geodesics. Finally, we analyze the weak field limit of the deflection angle, where we use the Gauss-Bonnet theorem for taking into account the finite distance of the source and the receiver to the lensing object. Remarkably, the distance of the receiver (or source) from the lensing object greatly influences the deflection angle. Moreover, $$c_{\textrm{O}}$$ c O needs be negative for a consistent solution. In our analysis, the rotating black hole acts as a particle accelerator and possesses the sensitivity to probe the symmergent gravity.

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Shadows and gravitational weak lensing by the Schwarzschild black hole in the string cloud background with quintessential field*

Cited by 59 publications

References 110 publications

Gravitational Lensing of Acoustic Charged Black Holes

Gravitational Lensing of Acoustic Charged Black Holes

Photon motion and weak gravitational lensing in black-bounce spacetime*

Testing symmergent gravity through the shadow image and weak field photon deflection by a rotating black hole using the M87$$^$$ and Sgr. $$\hbox {A}^$$ results

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Shadows and gravitational weak lensing by the Schwarzschild black hole in the string cloud background with quintessential field*

Cited by 59 publications

References 110 publications

Gravitational Lensing of Acoustic Charged Black Holes

Gravitational Lensing of Acoustic Charged Black Holes

Photon motion and weak gravitational lensing in black-bounce spacetime*

Testing symmergent gravity through the shadow image and weak field photon deflection by a rotating black hole using the M87$$^*$$ and Sgr. $$\hbox {A}^*$$ results

Contact Info

Product

Resources

About

Testing symmergent gravity through the shadow image and weak field photon deflection by a rotating black hole using the M87$$^$$ and Sgr. $$\hbox {A}^$$ results