Research Papers (JVN)

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Angular appearance of white holes
(Springer, 1978-01-22) Narlikar, J. V.; Kapoor, R. C.
It is shown that non-radial light rays emitted from the surface of a white hole can emerge from inside the Schwarzschild barrier. The upper limit on their impact parameter is calculated under the requirement that such rays are blueshifted. The apparent angular size of the white hole determined by blueshifted rays is shown to grow so rapidly in the early stages of its expansion that it produces the appearance of superluminal expansion.
Blueshift and spectral features of the gravitational searchlight
(Plenum Publishing Corporation, 1975-01-17) Chitre, S. M.; Narlikar, J. V.; Kapoor, R. C.
It is shown that a photon emitted in the forward direc- tion by a charged particle moving in an equatorial cir- cular orbit centred on a highly collapsed mass M, the radius being slightly in excess of one and a half times the Schwarzschild radius, is strongly blueshifted when it arrives at a distant receiver. A ring shaped emit- ting region composed of such orbiting particles has a power law spectrum of the form d~/~ as seen by a distant stationary observer.
Gravitational searchlight effect
(Astronomical Society of India, 1975-01-11) Chitre, S. M.; Narlikar, J. V.; Kapoor, R. C.
Gravitational searchlight and its astrophysical applications
(Nature Publishing Group, 1974-12-06) Chitre, S. M.; Narlikar, J. V.; Kapoor, R. C.