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Shadow analysis for rotating black holes in the presence of plasma for an expanding universe

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arxiv 2012.12914 v3 pith:WW4CZQ4L submitted 2020-12-23 gr-qc astro-ph.HEhep-th

Abhishek Chowdhuri , Arpan Bhattacharyya This is my paper · ORCID
classification gr-qcastro-ph.HEhep-th
keywords plasmashadowblackexpandingholepointpresenceuniverse
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We explore the structure of shadow for a Kerr-de Sitter black hole with a non-magnetized, pressureless plasma surrounding it. Specific plasma distributions are considered to separate the Hamilton-Jacobi equation and find the photon regions. An analytic formula describing the boundary curve of the shadow for such a black hole in an expanding universe for an observer at any finite point outside the horizon is derived. We observe deviations which are further explored by calculating the curvature radius at a particular point for such structures in the presence and absence of plasma and calculate the diameter of the shadow.

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Cited by 2 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Spinning generalizations of Majumdar-Papapetrou multi-black hole spacetimes: light rings, lensing and shadows

    gr-qc 2025-02 conditional novelty 6.0 of 10

    For the Teo-Wan two-black-hole spacetime, light rings merge and annihilate in pairs, giving total counts of 4, 6, or 8, and the shadows mimic double-Kerr.

  2. Plasma effects on gravitational lensing and shadow observables of a Kerr-like black hole in a dark matter halo

    gr-qc 2026-03 conditional novelty 4.0 of 10

    Homogeneous plasma enlarges Kerr-like black-hole shadows and emission rates while inhomogeneous plasma shrinks them; astrophysical dark-matter densities leave photon orbits essentially unchanged.

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