Publication date: Jan 1981
Abstract:
The photon trajectories in the Kerr-Newman metric are described in both the black hole and naked singularity cases. The radial motions of photons are discussed, and by finding the turning points of the radial motion, the regions allowed for this motion are determined. The region of negative radii is considered, and it is found that the qualitative differences between the Kerr-Newman metric and the Kerr metric occur only below the inner horizon and around naked singularities. In some cases stable circular orbits exist in the equatorial plane, and in other cases there are no spherical orbits on positive radii at all.
Authors:
Stuchlik, Z.;