Weak Gravitational Lensing by Stringy Black Holes

Javed, Wajiha; Khadim, Muhammad Bilal; Abbas, Jameela; Овгун, Али

doi:10.20944/preprints201912.0045.v1

Cited by 9 publications

(9 citation statements)

References 22 publications

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“…Then some other physicists study the light's deflection angle using the GBT. For example, the deflection angle of light studied for BHs and wormholes by the following writers ( [29]- [42]), Ovgun et al studied for different spacetimes like Schwarzschild-like spacetime in bumblebee gravity model ( [43]- [49]) and Javed et al studied the impact of various matter fields ( [50]- [54]). Next, Ishihara et al [55] expressed that it is conceivable to calculate the finite-distances's deflection angle (enormous effect parameter).…”

Section: Kdsmentioning

confidence: 99%

Weak Deflection Angle and Shadow by Tidal Charged Black Hole

Javed¹,

Hamza²,

Овгун³

2020

Preprint

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In this article, we calculate the deflection angle of tidal charged black hole (TCBH) in weak field limits. For doing this, first of all we obtain the Gaussian optical curvature and then apply the Gauss-Bonnet theorem on it and with the help of Gibbons-Werner method, we calculate the light's deflection angle by TCBH. After calculating the deflection angle of light, we check the graphical behavior of TCBH. Moreover, we further find the light's deflection angle in the presence of plasma medium and also check the graphical behavior in the presence of plasma medium. In the next section, we investigate the shadow of TCBH. For calculating the shadow, we first find the photon geodesic around the TCBH and then find its shadow. We also obtain TCBH's shadow in the plasma medium. Moreover, we also find shadow's shapes and discuss the effect of plasma on shadow.

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Section: Kdsmentioning

confidence: 99%

Weak Deflection Angle and Shadow by Tidal Charged Black Hole

Javed¹,

Hamza²,

Овгун³

2020

Preprint

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“…[], NED has appealed to account for inflation problem. The effect of NED on the gravitational lensing is also studied in several works . Gravitational lensing is known to be one of the most important predictions of Einstein's theory of general relativity, which is corroborated by astronomical observations.…”

Section: Introductionmentioning

confidence: 97%

Gravitational Lensing in a Model of Nonlinear Electrodynamics: The Case for Electrically and Magnetically Charged Compact Objects

Gürtuğ

Mangut

2020

Annalen der Physik

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The astrophysical applicability of the electrically and magnetically charged black hole solutions obtained in a model of nonlinear electrodynamics proposed by Kruglov is investigated. Theoretical calculations of the bending angles and gravitational redshifts from the theory of general relativity are studied numerically by using the stellar data of charged compact objects and a hypothetical quark star model. Calculations have revealed that although the theoretical outcomes differ from the linear Maxwell case, the plotted bending angles coincide with the linear case and it becomes hard to identify the effect of nonlinearity. However, the calculation of the redshift has shown that while the increase in the electric field leads to a decrease in the gravitational redshift,the presence of the strong magnetic field contributes to the gravitational redshift in an increasing manner.

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“…Islam et al have generalized the work on non-trivial 4D Einstein-Gauss-Bonnet theory of gravity in their paper [27] for the gravitational lensing by a Schwarzschild black hole. The authors of [28] have examined the weak gravitational lensing by stringy black holes for plasma and non-plasma mediums. The deflection angle of a dirty black hole is presented in [29] by Pantig and Rodulfo; essentially, a Schwarzschild black hole of mass surrounded by the dark matter.…”

Section: Introductionmentioning

confidence: 99%

Deriving Weak Deflection Angle by Black Holes or Wormholes using Gauss-Bonnet Theorem

Kumaran,

Övgün

2021

Preprint

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In this review, various researches on finding the bending angle of light deflected by a massive gravitating object which regard the Gauss-Bonnet theorem as the premise have been revised. Primarily, the Gibbons and Werner method is studied apropos of the gravitational lensing phenomenon in the weak field limits. Some exclusive instances are deliberated while calculating the deflection angle, beginning with the finite-distance corrections on non-asymptotically flat spacetimes. Effects of plasma medium is then inspected to observe its contribution to the deflection angle. Finally, the Jacobi metric is explored as an alternative method, only to arrive at similar results. All of the cases are probed in three constructs, one as a generic statement of explanation, one for black holes, and one for wormholes, so as to gain a perspective on every kind of influence.

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Weak Gravitational Lensing by Stringy Black Holes

Cited by 9 publications

References 22 publications

Weak Deflection Angle and Shadow by Tidal Charged Black Hole

Weak Deflection Angle and Shadow by Tidal Charged Black Hole

Gravitational Lensing in a Model of Nonlinear Electrodynamics: The Case for Electrically and Magnetically Charged Compact Objects

Deriving Weak Deflection Angle by Black Holes or Wormholes using Gauss-Bonnet Theorem

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