Gravitational weak lensing of Schwarzschild-like black hole in presence of plasma

Atamurotov, Farruh; Sarikulov, Furkat

doi:10.1140/epjp/s13360-022-02780-x

Cited by 17 publications

(6 citation statements)

References 68 publications

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“…Earlier detailed study of the spherical symmetric regular black hole was performed by the same authors in [78]. Later, photon sphere, innermost stable circular orbits around regular black holes with asymptotically Minkowski cores have been studied in [79] and efect of plasma on gravitational weak lensing is also considered in Schwarzschild-like black hole in [80]. Now our main goal in this study is to develop earlier works on Kerr-like spacetime and investigate the optical properties of Kerr-like BHs.…”

Section: Introductionmentioning

confidence: 99%

Shadow of the Kerr-like black hole

et al. 2022

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The detailed study of horizon structure and the shadow cast by a Kerr-like black hole (BH) is performed. The trajectory of light rays forming the shadow of BH is found using the solutions of geodesic equation for the motion and effective potential of a photon around Kerr-like BH for different values of deviation parameter l in Kerr-like spcetime metric. It is observed that with an increase in the parameter l the size of the shadow of the BH is decreased. Additional, we have consider effect of plasma on BH shadow and the plasma influence on the shadow of Kerr-like BH, the size of observable radius of BH shadow and oblateness are explored with more details.

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Section: Introductionmentioning

confidence: 99%

Shadow of the Kerr-like black hole

et al. 2022

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“…The influence of a uniform plasma on weak gravitational lensing by a spherically symmetric BH in a modified gravity theory has been investigated in Refs. [135][136][137][138][139][140][141][142][143][144][145][146]. Some other recent interesting works relating the effects of plasma on the optical properties of BHs in Einstein gravity and other theories of gravity can be found in literature [147][148][149][150][151][152].…”

Section: Introductionmentioning

confidence: 99%

Weak deflection angle and shadow cast by the charged-Kiselev black hole with cloud of strings in plasma*

Atamurotov

Hussain²,

Mustafa³

et al. 2023

Chinese Phys. C

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In this work, the gravitational deflection angle of photon in the weak field limit (or the weak deflection angle) and shadow cast by the electrically charged and spherically symmetric static Kiselev black hole (BH) in the string cloud background are investigated. The influence of the BH charge $Q$, the quintessential parameter $\gamma$ and the string cloud parameter $a$ is studied on the weak deflection angle using the Gauss-Bonnet theorem, on the radius of photon spheres and on the size of the BH shadow in the spacetime geometry of the charged-Kiselev BH in string clouds. Moreover, we study the effects of plasma (uniform and non-uniform) on the weak deflection angle and on the shadow cast by the charged-Kiselev BH surrounded by the clouds of strings. In the presence of uniform/nonuniform plasma medium, increase in the cloud of string parameter $a$, increases the deflection angle $\alpha$. On the other hand decrease in the BH charge $Q$, decreases the deflection angle. Further we observe that an increase of the BH charge $Q$ causes a decrease in the size of the shadow of the BH. We notice that with increase in the values of the parameters $\gamma$ and $a$, the size of the BH shadow also increases and therefore the intensity of the gravitational field around the charged-Kiselev BH in string clouds increases. Thus the gravitational field of the charged-Kiselev BH in string cloud background would be stronger than the field produced by the pure Reissner-Nordstrom BH. Moreover, we use the data released by the Event Horizon Telescope (EHT) collaboration, for the supermassive BHs M87* and Sgr A*, to obtain constraints on the values of the parameters $\gamma$ and $a$.

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“…These authors not only studied gravitational lensing and BH shadows in the presence of plasma but also investigated plasma accretion in the radial infall of the BH. In the literature, plasma effects on the shadows of diverse modified gravity BHs have been vigorously investigated for phenomenological reasons [15][16][17][18][19][20][21][22][23], along with gravitational weak lensing in the presence of plasma [24][25][26][27][28][29][30][31][32][33][34]. Previously, gravitational lensing in the weak and strong field regimes in the vacuum surrounding BHs has been reported by some authors in Refs.…”

Section: Introduction R −Nmentioning

confidence: 99%

Quantum effects on the black hole shadow and deflection angle in the presence of plasma*

Atamurotov¹,

Jamil²,

Jusufi³

2023

Chinese Phys. C

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In this paper, optical properties of renormalization group improved (RGI) Schwarzschild black hole (BH) are investigated in plasma medium. Starting from the equations of motions in plasma medium, we have shown how the shadow radius of the RGI black hole is modified. To this end, we have computed the deflection angle of light in the weak gravity regime for uniform and non-uniform plasma medium. Importantly, due to the plasma medium, we find that the equations of motions for light obtained from the radiating and infalling/rest gas has to be modified. This in turn, changes and modifies the expression for the intensity observed far away from the black hole. Finally, we have obtained the shadow images for the RGI black hole for different plasma models. Even thought, quantum effect changes the background geometry, these effects are very small and, practically, it is impossible to detect them with the present technology using the supermassive black hole shadows. The parameter $\Omega$ encodes the quantum effects and, in principle, one expects such quantum effects to play a significant role only for very small black holes. On the other hand, the effect of plasma medium can play important role on the optical appearance of black holes since they effect and modify the equations of motions.

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Gravitational weak lensing of Schwarzschild-like black hole in presence of plasma

Cited by 17 publications

References 68 publications

Shadow of the Kerr-like black hole

Shadow of the Kerr-like black hole

Weak deflection angle and shadow cast by the charged-Kiselev black hole with cloud of strings in plasma*

Quantum effects on the black hole shadow and deflection angle in the presence of plasma*

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