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

We explore the structure of shadow for a Kerr-de Sitter black hole with a nonmagnetized, 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 sha...

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Bibliographic Details
Published in:Physical review. D 2021-09, Vol.104 (6), p.1, Article 064039
Main Authors: Chowdhuri, Abhishek, Bhattacharyya, Arpan
Format: Article
Language:English
Subjects:
Big Bang theory
Black holes
Diameters
Hamilton-Jacobi equation
Mathematical analysis
Plasma
Rotating plasmas
Shadows
Universe
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Summary:We explore the structure of shadow for a Kerr-de Sitter black hole with a nonmagnetized, 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 and distortion parameter for such structures in the presence and absence of plasma and calculate the diameter of the shadow.
ISSN:2470-0010
2470-0029
DOI:10.1103/PhysRevD.104.064039