Publication date: Dec 2005
The integrals of photon motion in the Kerr spacetimes are given in terms
of the emission angles related to emitters moving along the circular
geodesic orbits. The local frames of the circular geodesic emitters are
given in relation to the locally nonrotating frames and local
directional angles of the escape cones are given in terms of the motion
constants of photons.
Schee, Jan; Stuchlík, Zdeněk; Jurán, Josef;