In 1905, Einstein presented the special theory of relativity where he determined
that the laws of physics appear same in all inertial frames and the speed of light is
constant in vacuum. After the discovery of special theory of relativity, Einstein took
another ten years to include acceleration in his theory and in 1915 he established the
general theory of relativity for an accelerating observer [1]. The general relativity
(GR) is a theory of gravity in which Einstein presented a unified picture of space
and time, well known as spacetime which was abandoned by Newtonian gravity
[2]. One of the most interesting and intriguing prediction of GR is the existence of
black holes in our universe. Black holes are the region in the spacetime where the
gravitational pull is so high that even light cannot escape from it. Black holes are
the most exotic astrophysical objects due to its unique behavior and a black hole
solution can be found by solving Einstein field equations.
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