https://doi.org/10.1140/epjp/s13360-022-03218-0
Regular Article
Shadow of a charged rotating black hole in f(R) gravity
1
Department of Physics, University of Guilan, 41335-1914, Rasht, Iran
2
Elettra-Syncrotrone Trieste, SS14, Km 163.5, 34149, Basovizza, TS, Italy
3
Department of Mining and Technology, Yasouj University, 75761, Choram, Iran
Received:
3
April
2022
Accepted:
22
August
2022
Published online:
4
September
2022
A charged rotating black hole in f(R) gravity is characterized by mass, M, spin, a, electric charge, Q, and 
which is proportional to cosmological constant. We analyze the image of the black hole shadow in four types (1) at 
, (2) at 
in vacuum, (3) at and (4) at for an observer at the presence of plasma. Moreover, we investigate the effect of spin, charge, and modification of gravity on the shape of the shadow. In addition, we use two observable parameters, the radius 
and the distortion parameter 
, characterizing the apparent shape. We show that the shadow becomes smaller with increasing electric charge for all cases. Also, by increasing the rotation parameters, the circular symmetry of the black hole’s shadow image will change. Furthermore, in the presence of plasma, the plasma parameter also affects the size of the shadow.
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© The Author(s), under exclusive licence to Società Italiana di Fisica and Springer-Verlag GmbH Germany, part of Springer Nature 2022. Springer Nature or its licensor holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s); author self-archiving of the accepted manuscript version of this article is solely governed by the terms of such publishing agreement and applicable law.
