Physics – Optics
Scientific paper
Feb 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984zhetf..86..385d&link_type=abstract
Zhurnal Eksperimental'noi i Teoreticheskoi Fiziki (ISSN 0044-4510), vol. 86, Feb. 1984, p. 385-389. In Russian.
Physics
Optics
2
Geometrical Optics, Gravitational Fields, Gravitational Lenses, Radiation Sources, Rotating Bodies, Time Lag, Black Holes (Astronomy), Photons, Point Sources, Ray Tracing
Scientific paper
The existence of the relative delay of rays emitted from a point source and focused by the gravitational field of a rotating massive body is demonstrated; the rays arrive at an observation point that lies on the same line as the sources and the focusing mass in its equatorial plane. It is shown that an additional gravitational delay of signals due to rotation is negative for photons moving parallel to the rotation axis and for photons moving in the equatorial plane in the rotation direction. Photon scattering by a rotating black hole is considered, with particular attention given to the relative delay of photons arriving with impact parameters close to the critical ones and forming the cross-section boundary of capture by the hole. The relative delay is due to the asymmetry of this cross section.
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