Shadow of a Charged Rotating Black Hole in $f(R)$ Gravity

Understand

We study the shadow of a charged rotating black hole in $f(R)$ gravity.

• This black hole is characterized by mass, $M$, spin, $a$, electric charge, $Q$ and $R_{0}$ which is proportional to cosmological constant.
• We analyze the image of the black hole's shadow in four types 1) at $r\rightarrow\infty$, 2) at $r\rightarrow r_{o}$, in vacuum, 3) at $r\rightarrow\infty$, 4) at $r\rightarrow r_{o}$, for an observer at the presence of plasma.
• Moreover, we investigate the effect of spin, charge and modfication of gravity on the shape of shadow.