J V Narlikar
Articles written in Pramana – Journal of Physics
Volume 2 Issue 3 March 1974 pp 158-170 Cosmology
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
The motion of a tachyon in the empty Schwarzschild solution outside a mass
Volume 18 Issue 5 May 1982 pp 385-396 General Relativity
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.
Volume 94, 2020
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