Shadow of a charged rotating black hole in f(R) gravity
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
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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