Research Publications

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Author: search.filters.author.Narlikar, J. V.Subject: search.filters.subject.Galaxies

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Now showing 1 - 8 of 8
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    Stellar and extragalactic radiation at the earth’s surface
    (IOP Publishing, 2006-03-27) Pecker, J. C.; Narlikar, J. V.
    Reviving a calculation made by Eddington in the 1920s, and using the most recent and comprehensive databases available on stars and galaxies, including more than 2,500,000 stars and around 20,000 galaxies we have computed their total radiation received at the Earth just outside its atmosphere. This radiation density, if thermalized, would be equivalent to a temperature of 4.212 K. The comparability of this temperature to that of the cosmic microwave background (2.723 K) may either be a pure coincidence or may hold a key to some as yet unknown, aspect of the universe.
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    Dynamics of ejection from galaxies and the variable mass hypothesis
    (World Scientific Publishing Company, 2001-05-29) Narlikar, J. V.; Vishwakarma, R. G.; Banerjee, Shyamal K.
    Increasing numbers of active galaxies with signi cant alignments of quasars are being observed. It is the purpose of this paper to explore ejection dynamics of these quasars using the variable mass hypothesis (VMH) originally discussed by Narlikar and Das in 1980. According to the VMH quasars are ejected from parent galaxies initially with zero rest mass which grows through a Machian interaction. The intrinsic redshift of the quasar steadily decreases as its mass grows, but always remains in excess of the redshift of the galaxy. The ultimate aim of this hypothesis is to quantitatively relate the observed ordering of redshifts of ejected quasars, with separation from the galaxy, their intrinsic redshifts and the age of the evolutionary stage of the ejecta.
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    Case against the big bang
    (Elsevier Science Publishers, 1999-04-14) Narlikar, J. V.
    This article takes a critical look at the Hot Big Bang Cosmology (HBBC). It shows that two of its strongest lines of evidence, viz the cosmic microwave background and the abundance of light nuclei are capable of being interpreted differently, and in a physically more realistic way the HBBC is shown to have shifted its ground frequently under observational constraints, changing its parameters like Ω0, Ωb, Ωλ and q0, reinterpreting inflation, bedging options on dark matter, etc. Many of its present deductions are seen to be based on untested physics and unobservable events of the very early Universe, while its beginning in a spacetime singularity indicates its incompleteness as a physical theory. The example of the quasi steady singularity indicates its incompleteness as a physical theory. The example of the quasi-steady state cosmology (QSSC) is given to demonstrate that an alternative cosmology relying more on the ongoing astrophysical properties of the Universe and directly observable events is possible. The case is therefore made that the HBBC does not hold the ‘monopoly’ to be THE model of the Universe.
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    How universal is Hubble's law?
    (Indian Mathematical Society, 1995-05-18) Narlikar, J. V.
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    Quasi-steady state cosmology : a note on criticisms by E.L. Wright
    (Wiley-Blackwell, 1995-08-11) Hoyle, F.; Burbidge, G.; Narlikar, J. V.
    We answer criticisms made by Wright of the quasi-steady-state cosmology (QSSC). It is shown that none of his criticisms is valid, and the QSSC remains a viable cosmologies theory.
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    On the formation of elliptical galaxies
    (Royal Society, 1966-02-22) Hoyle, F.; Narlikar, J. V.
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    Associations between quasi-stellar objects and galaxies
    (American Astronomical Society, 1990-11-12) Burbidge, G.; Hewitt, A.; Narlikar, J. V.; et al.
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    Noncosmological redshifts
    (Springer, 1988-09-08) Narlikar, J. V.
    Six decades ago Edwin Hubble found his velocity-distance relation that soon became the observational foundation of modern cosmology. According to the Cosmological Hypothesis (CH), all extragalactic objects — galaxies and the quasi-stellar objects — derive their redshifts from the expansion of the Universe. This article reviews the evidence for and against the CH. To what extent is it universal? Does it provide the entire redshift of an extragalactic object? If an extra, noncosmological component of redshift is present, what is it due to? On the observational side the evidence presented here is of three kinds: (i) evidence that is prima facie consistent with the CH, (ii) neutral evidence that can be reconciled with the CH with a few epicycles, and (iii) discordant evidence which, if accepted, suggests that some objects at least possess substantial noncosmological redshifts. The final part of this review discusses the various theories proposed to account for noncosmological redshifts and outlines further tests to establish the validity or otherwise of the CH.