Research Papers (JVN)

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Black holes as detectors of tachyons
(General Relativity and Gravation, 1978-01-17) Narlikar, J. V.; Dhurandhar, Sanjeev
Tachyon trajectories in Schwarzschild's space-time
(Springer, 1976-03-15) Narlikar, J. V.; Dhurandhar, Sanjeev
The motion of a tachyon in the empty Schwarzschild solution outside a mass m i~ discussea. It is shown that a tachyon falling radially inwards never reaches the space-time singularity at the origin. Instead, it is bounced back at a point inside the Schwarzschild radius. The causal and non-causal aspects of such a bounce are considered. It is shown that a tachyon dropped from a radial co- ol'dinate < 2.56 m always aarives before it went in whereas a tachyon dropped from a radial co-ordinate >3.27 m always arrives later than its starting time. The more general case of a tachyon with a finite angular momentum is also analyzed. The possible astrophysical consequence7 of the presence of tachyons near condensed or collapsing objects and black holes are qualitathely discussed.