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.;