Research Publications
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Item Mahasphotochya parshwabhumivar umatleli paulchine?(Maharashtra Times, 17-02-02) Naralikar, J.V.Item A comparison of synthetic and observed spectra for G-K dwarfs using arti(Astron. Astrophys, 1967-01-18) Gulati, R.K; Gupta, Ranjan; Rao, N.KA library of synthetic spectra, based on Kurucz model atmospheres, has been used to compare the spectroscopic observations in thewavelength range 4850-5384 A by using statistical and supervised arti cial neural network methods. The effective temperatures assigned by these methods for G-K dwarfs are compared with those given in Gray and Corbally (1994) and found to be closely matching their calibration curve. This result provides a promising new technique for determination of fundamental stellar atmospheric parameters on the basis of comparison between the model generated synthetic spectra and observed stellar spectra.Item Arrow of time(Science today, 1969-02-01) Narlikar, J. V.Item Unsteady Univerese?(New Scientist, 1965-06-15) Naralikar, J.V.Item Gravitational collapse(Discovery, 1964-01-10) Naralikar, J.V.Item Galaxies(Observatory, 1961-02-10) Naralikar, J.V.Item Electrodynamics of direct interparticle action I : The quantum mechanical response of the universe(Academic Press, 1969-03-10) Hoyle, F.; Narlikar, J. V.The present paper is the first of a series that seeks to obtain results in agreement with experience from a completely time-symmetric electromagnetic theory-i.e. which does not permit an ad hoc restriction to retarded solutions of time-symmetric equations. It is remarkable that the development of a wholly time-symmetric theory must be along lines entirely different from the usual electrodynamics. While a first quantisation of the particles can readily be carried out, there can be no separate quantisation of the field, since the field is wholly determined by the particles. This raises the question of how practical results that have hitherto been thought to arise from field quantisation can be obtained. The most immediate problem of this kind concerns the spontaneous transitions of atoms. Much of the present paper is directed toward showing that this problem can indeed be solved without the need for field quantisation. Although this question might appear simple compared to other issues in quantum e1ectrodynamics-e.g. vacuum polarisation-it is not trivial in its implication, for the establishment of one such case provides a critical precedent. The path integral method of first quantisation is used to demonstrate that provided the Universe is a perfect absorber along the future light cone the usual formulae for level shifts and for spontaneous transitions can be obtained in a steady-state model of the Universe, but not in open Friedmann models.Item Cosmology and quantum electrodynamics(Nature Publishing Group, 1969-06-14) Hoyle, F.; Narlikar, J. V.Item Recent developments in cosmology(Plenum Press, 1968-03-15) Narlikar, J. V.Item Cosmology and electrodynamics(Nature Publishing Group, 1968-11-30) Hoyle, F.; Narlikar, J. V.