Shadow of rotating regular black holes

By A. Abdujabbarov, Muhammed Amir, B. Ahmedov, Sushant G. Ghosh. 2016

271 citations recorded by the source corpus.

We study the shadows cast by the different types of rotating regular black holes viz. Ay\'on-Beato-Garc\'{\i}a (ABG), Hayward, and Bardeen. These black holes have in addition to the total mass ($M$) and rotation parameter ($a$), different parameters as electric charge ($Q$), deviation parameter ($g$), and magnetic charge (${g}_{*}$). Interestingly, the size of the shadow is affected by these parameters in addition to the rotation parameter. We found that the radius of the shadow in each case decreases monotonically, and the distortion parameter increases when the values of these parameters increase. A comparison with the standard Kerr case is also investigated. We have also studied the influence of the plasma environment around regular black holes to discuss its shadow. The presence of the plasma affects the apparent size of the regular black hole's shadow to be increased due to two effects: (i) gravitational redshift of the photons and (ii) radial dependence of plasma density.

Subfields: Astronomy and Astrophysics, Atomic and Molecular Physics, and Optics

View Paper: https://www.semanticscholar.org/paper/10397794f41c373c0e19220bd38cb54d6ecf3998

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In Astronomy and Astrophysics

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Citations in the corpus

Gravitational Lensing in Presence of Plasma: Strong Lens Systems, Black Hole Lensing and Shadow (2017, background): “Numerous analytical investigations and numerical simulations of the shadow are presented in literature (for example, see [90, 101, 95, 85, 86, 103, 104, 105, 94, 98, 99, 91, 106, 102, 97, 87, 88, 89, 93, 92, 96, 100, 110, 107, 108, 109, 111]).”
Constraints on black-hole charges with the 2017 EHT observations of M87* (2021, background): “, in the distortion parameter δsh defined in [57,83] (see Appendix).”
Silhouette of M87*: A new window to peek into the world of hidden dimensions (2019, background): “The shadow is formed when photons with small impact parameter originating from a source of electromagnetic radiation behind the BH gets trapped by its gravity [48–55] and hence fail to reach the observer.”
Shadow of the regular Bardeen black holes and comparison of the motion of photons and neutrinos (2019, background): “spacetime [28] or Kerr-de Sitter spacetime [2,20,26,27,33, 47,55,62], or rotating regular black hole spacetimes [3].”
Black Hole Parameter Estimation from Its Shadow (2018, methodology): “…rotating dilaton black hole (Amarilla & Eiroa 2013), rotating braneworld black hole (Amarilla & Eiroa 2012; Eiroa & Sendra 2018), regular black holes (Abdujabbarov et al. 2016; Amir & Ghosh 2016; Kumar et al. 2019), and black holes in higher dimensions (Papnoi et al. 2014; Abdujabbarov et al.…”
Magnetically charged black holes from non-linear electrodynamics and the Event Horizon Telescope (2019, unknown): “[78–112].”
Shadow and quasinormal modes of a rotating loop quantum black hole (2020, background): “The calculations of the shadow size and shape, and their observational implications from different black hole spacetimes or spacetimes of compact objects with exotic matters ether in general relativity or in modified theories of gravity have been extensively studied, see, for example, [10–49].”