Analytical study of light ray trajectories in Kerr spacetime in the presence of an inhomogeneous anisotropic plasma

Fathi, Mohsen; Olivares, Marco; Villanueva, J. R.

doi:10.48550/arxiv.2104.07721

Cited by 6 publications

(6 citation statements)

References 26 publications

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“…Even before the first ever observation of the BH shadow in 2019 by the Event Horizon Telescope collaboration [62,63] various authors have studied the shadow of the black hole/compact objects within general relativity and modified/alternative theories of gravity (see, e.g. [64][65][66][67][68][68][69][70][71][72][72][73][74][75][76][77][77][78][79][80][81][82][83][84][84][85][86][87][88][89][90][91][92][93][94][95][96][97][98]) and also the authors studied the effect of plasma on the BH shadow in [99][100][101][102][103][104][105]. Observation data on the shadow of supermassive BHs at the center of M87…”

Section: Introductionmentioning

confidence: 99%

Probing geometric proca in metric-palatini gravity with black hole shadow and photon motion

et al. 2023

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Extended metric-Palatini gravity, quadratic in the antisymmetric part of the affine curvature, is known to lead to the general relativity plus a geometric Proca field. The geometric Proca, equivalent of the non-metricity vector in the torsion-free affine connection, qualifies to be a distinctive signature of the affine curvature. In the present work, we explore how shadow and photon motion near black holes can be used to probe the geometric Proca field. To this end, we derive static spherically symmetric field equations of this Einstein-geometric Proca theory, and show that it admits black hole solutions in asymptotically AdS background. We perform a detailed study of the optical properties and shadow of this black hole and contrast them with the observational data by considering black hole environments with and without plasma. As a useful astrophysical application, we discuss constraints on the Proca field parameters using the observed angular size of the shadow of supermassive black holes M87$$^*$$ ∗ and Sgr A$$^*$$ ∗ in both vacuum and plasma cases. Overall, we find that the geometric Proca can be probed via the black hole observations.

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Section: Introductionmentioning

confidence: 99%

Probing geometric proca in metric-palatini gravity with black hole shadow and photon motion

et al. 2023

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“…Consequently, the form and size of shadow is sensitive to the plasma medium surrounding the black hole (see, e.g. [81][82][83][84][85][86][87][88]).…”

Section: Introductionmentioning

confidence: 99%

Testing the Metric-Affine Gravity Using Particle Dynamics and Photon Motion

Ditta¹,

Xia²,

Mumtaz³

et al. 2023

Preprint

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This work mainly focuses to unveil the optical features of a black hole. For this objective, we utilize the metric-affine black hole geometry with the inclusion of dilation, spin, and shear charge. The Lagrangian coefficients f1 and d1 are the main parameters, where f1 < 0, which differentiate the solutions by d1 = 8f1, d1 = −8f1, & d1 = ±8f1. Based on these parameters, we carry out this work in two cases, i.e., d1 = 8f1, & d1 = −8f1. We forecast the detailed impact of dilation, spin, and shear charges on the optical properties of black hole in both cases. To unreveal the optical features, we calculate horizon radius, inner stable circular orbit, photon sphere radius, BH shadows, quasi-periodic oscillations, the red-blue shift of photon particles, effective force, weak gravitational lensing, and image magnification by using metric-affine gravity black hole geometry.

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“…The plasma (of both inhomogeneous and homogeneous plasma density) effect on observational shape of BH shadow has been studied in various spacetimes in the recent literature (see, e.g. [38,41,[59][60][61][62][63][64][65]). On the other hand the effects of plasma of different configurations on gravitational lensing and consequently on deflection angle of light rays in various BH spacetimes have been investigated, see e.g.…”

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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Analytical study of light ray trajectories in Kerr spacetime in the presence of an inhomogeneous anisotropic plasma

Cited by 6 publications

References 26 publications

Probing geometric proca in metric-palatini gravity with black hole shadow and photon motion

Probing geometric proca in metric-palatini gravity with black hole shadow and photon motion

Testing the Metric-Affine Gravity Using Particle Dynamics and Photon Motion

Shadow of the Kerr-like black hole

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