Shadow of rotating regular black holes

Ahmadjon Abdujabbarov, Muhammed Amir, Bobomurat Ahmedov, and Sushant G. Ghosh
Phys. Rev. D 93, 104004 – Published 3 May 2016

Abstract

We study the shadows cast by the different types of rotating regular black holes viz. Ayón-Beato-García (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.

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  • Received 18 February 2016

DOI:https://doi.org/10.1103/PhysRevD.93.104004

© 2016 American Physical Society

Physics Subject Headings (PhySH)

  1. Research Areas
Gravitation, Cosmology & Astrophysics

Authors & Affiliations

Ahmadjon Abdujabbarov1,2,3,*, Muhammed Amir4,†, Bobomurat Ahmedov1,2,3,‡, and Sushant G. Ghosh4,5,§

  • 1Institute of Nuclear Physics, Ulughbek, Tashkent 100214, Uzbekistan
  • 2Ulugh Beg Astronomical Institute, Astronomicheskaya 33, Tashkent 100052, Uzbekistan
  • 3National University of Uzbekistan, Tashkent 100174, Uzbekistan
  • 4Centre for Theoretical Physics, Jamia Millia Islamia, New Delhi 110025, India
  • 5Astrophysics and Cosmology Research Unit, School of Mathematics, Statistics and Computer Science, University of KwaZulu-Natal, Private Bag X54001, Durban 4000, South Africa

  • *ahmadjon@astrin.uz
  • amirctp12@gmail.com
  • ahmedov@astrin.uz
  • §sghosh2@jmi.ac.in

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Issue

Vol. 93, Iss. 10 — 15 May 2016

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