Research Papers (JVN)
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Item Alternative cosmologies(Dordrecht, D. Reidel Publishing Co., 1987-04-12) Narlikar, J. V.This review highlights some of the cosmological theories proposed as alternatives to the standard hot big bang model. Specific ideas discussed here are the matter-antimatter symmetric cosmologies, the empirical two-component model, the G-varying cosmologies, the chronometric cosmology and a simplified quantum cosmology. It is argued that many alternative cosmologies have contributed useful concepts and offered observational tests that have enriched the field of cosmology as a science.Item Conformal quantization and space-time singularity(World Scientific Publishing group, 1986-06-06) Joshi, P. S.; Narlikar, J. V.This work generalizes earlier results of conformal quantization that within the full range of space-times conformal to any singular space-time satisfying Einstein's field equations for minimally coupled matter, the singular solutions form a set of zero-probability measure. A wider definition of space-time singularity that includes the curvature singularity assumed in the earlier work (op. cit.) is adapted and it is shown that the previous conclusion stands even when the present state of the universe is defined by wave functionals that are not necessarily wave packets. Within the present framework of quantum gravity therefore it seems extremely unlikely that the universe had a singular origin.Item Luminosity volume test and the local hypothesis of quasars(Indian Academy of Sciences, 1986-01-28) Hoyle, F.; Narlikar, J. V.It is shown that the luminosity-volume test for optically selected objects has an in-built bias towards increasing the average value of V/Vm above the Euclidean value of 1/2. A more satisfactory bias-free statistic is suggested in the form of In (V/Vm), The result of applying the test to a sample from the Bright Quasar Survey (BQS) shows that the local hypothesis of quasars is consistent with the data.Item Temperature fluctuations of cosmic microwave background induced by gravitational lensing(Elsevier Science Publishers, 1986-06-26) Chitre, S. M.; Narlikar, J. V.; Padmanabhan, T.Item Noncosmological redshifts(Reidel, 1986-11-06) Narlikar, J. V.Item Baryon non-conservation and Cosmology(Tata McGraw Hill, 1986-12-14) Narlikar, J. V.Item Lighter side of gravity(Proceedings of the GIREP Conference in Copenhagen, 1986-04-15) Narlikar, J. V.This talk presents a light-hearted look at the phenomenon of gravity, the most enigmatic of all known natural interactions. The fact that a major international society is wholly devoted towards understanding this basic interaction of nature is ample testimony to its intellectual challenges. The GR-meetings are held once every three years to bring together workers in the field to share their ignorance as well as expertise in the field of gravity. It would be presumptuous on my part to attempt to tell anything new to the experts gathered here. This evening I will stay away from the complexities and take a light hearted look at some ideas and phenomena that make gravity so peculiar.Item Volume of a tetrahedron(International Journal of Mathematical Education, 1985-09-29) Narlikar, J. V.The area of a triangle can be expressed algebraically in terms of its three sides. Similarly the volume of a tetrahedron can be given as an algebraic function of the lengths of its six edges. The proof of this result is usually obtained by using vector methods. The following dis- cussion gives a more elementary derivation of this interesting result.Item Did the universe have an origin?(Indian Journal of Physics, 1985-11-29) Narlikar, J. V.Item Some aspects of modern cosmology(Tira Pustaka, Jakartal, 1985-10-29) Narlikar, J. V.