Professor Jayant V. Narlikar

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Black holes as detectors of tachyons
(General Relativity and Gravation, 1978-01-17) Narlikar, J. V.; Dhurandhar, Sanjeev
On searches for gravitational waves from mini-creation events by laser interferometric detectors
(Wiley-Blackwell, 2006-02-27) Sarmah, B. P.; Banerjee, S.K.; Dhurandhar, Sanjeev; et al.
As an alternative view to the standard big bang cosmology, the quasi-steady-state cosmology argues that the Universe was not created in a single great explosion: it did not have a beginning, nor will it ever come to an end. The creation of new matter in the Universe is a regular feature occurring through finite explosive events. Each creation event is called a mini-bang, or a mini-creation event. Gravitational waves are expected to be generated as a result of any anisotropy present in this process of creation. A mini-creation event that ejects matter in two oppositely directed jets is thus a source of gravitational waves, which can in principle be detected by laser interferometric detectors. In the present work we consider the gravitational waveforms propagated by linear jets and then estimate the response of laser interferometric detectors such as LIGO and LISA.
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.
Tachyons and the second law of black hole physics
(Springer, 1978-01-27) Dhurandhar, Sanjeev; Narlikar, J. V.
It is shown that the usual proof of the second law of black hole physics breaks down if there are tachyons present in the vicinity of a black hole. Explicit cases are discussed where a tachyon of positive energy falling into the Kerr singularity actually decreases the area of the Kerr black hole.