Abstract
We have studied the null geodesics in the background of the Kerr–Newman black hole veiled by a plasma medium using the Hamilton–Jacobi method. The influence of black hole’s charge and plasma parameters on the effective potential and the generic photon orbits has been investigated. Furthermore, our discussion embodies the effects of black hole’s charge, plasma and the inclination angle on the shadow cast by the gravity with and without the spin parameter. We examined the energy released from the black hole as a result of the thermal radiations, which exclusively depends on the size of the shadow. The angle of deflection of the massless particles is also explored considering a weak-field approximation. We present our results in juxtaposition to the analogous black holes in General Relativity, particularly the Schwarzschild and Kerr black hole.
Highlights
The existence of super massive black holes has been investigated extensively for nearly 2 decades, through various esoteric astrophysical phenomena
Synge [3] studied the shadow of the Schwarzschild black hole, which was termed as the “escape cones” of light
In this paper we reviewed some well known features of the black hole, i.e., the black hole silhouette, energy emission and the weak field lensing in the background of the Kerr– Newman gravity walled in by a plasma medium
Summary
The existence of super massive black holes has been investigated extensively for nearly 2 decades, through various esoteric astrophysical phenomena. The first, foremost accurate calculations of the shadow were done by Bardeen considering the Kerr space time [4] The latter feature of the black hole has been widely investigated for various gravities adopting a similar approach using classical method [5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24]. We shall put forth the Synge formulism analysis in analogy to the aforementioned papers to retrace the influence of plasma on the Kerr–Newman space-time. It is a stationary and an axisymmetric solution to the Einstein– Maxwell equations depending on the mass, angular momentum and electrical charge of the black hole.
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