Null geodesics and shadow of a rotating black hole in extended Chern-Simons modified gravity
Null geodesics and shadow of a rotating black hole in extended Chern-Simons modified gravity
The Chern-Simons modification to general relativity in four dimensions consists of adding to the Einstein-Hilbert term a scalar field that couples to the first class Pontryagin density. In this theory, which has attracted considerable attention recently, the Schwarzschild metric persists as an exact solution, and this is why this model …