J V Narlikar
Articles written in Pramana – Journal of Physics
Volume 2 Issue 3 March 1974 pp 158-170 Cosmology
Mini-bangs in cosmology and astrophysics
The ideas originally proposed to discuss continuous creation of matter are reconsidered in the context of the big bang cosmological models. It is shown that singularity-free big bang models are possible under the modified field equations of general relativity. However, the case is made out that matter creation takes place in several mini-bangs at different epochs rather than in one big bang. The implications of this idea for high energy astrophysics and for gravitational radiation are discussed.
Volume 6 Issue 6 June 1976 pp 388-398 General Relativity
Tachyon trajectories in Schwarzschild’s space-time
The motion of a tachyon in the empty Schwarzschild solution outside a mass
Volume 18 Issue 5 May 1982 pp 385-396 General Relativity
Black hole physics in globally hyperbolic space-times
The usual definition of a black hole is modified to make it applicable in a globally hyperbolic space-time. It is shown that in a closed globally hyperbolic universe the surface area of a black hole must eventually decrease. The implications of this breakdown of the black hole area theorem are discussed in the context of thermodynamics and cosmology. A modified definition of surface gravity is also given for non-stationary universes. The limitations of these concepts are illustrated by the explicit example of the Kerr-Vaidya metric.
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