IUCAA Preprints

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Author: search.filters.author.Narlikar, J. V.

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    Gravity wave from mini-creation events
    (2015-01-13) Dasgupta, P.; Narlikar, J. V.
    This paper examines the possibility of testing the hypothesis recently proposed by some authors that, instead of the one-shot creation of the entire Universe in a big bang, creation of matter takes place in finite bursts at random in a Universe that is without a beginning and whose expansion on the large scale is as given by the steady state model. It is argued that if the creation events are anisotropic then they generate gravitational waves. Calculations are given to show that a laser interferometric detector of the UGO type would easily detect an event that generates -100-1000M0 .Further, the cosmological gravitational wave background generated by the minicreationevents is compared with the limits set by the analysis of the arrival time of pulses from millisecond pulsars. The existing data place severe constraints on the mass and anisotropies of the mini-creation events.
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    Flat spacetime cosmology: A unified framework for extragalactic redshifts
    (2014-11-26) Narlikar, J. V.; Arp, H. C.
    It is known that the standard Friedmann cosmology with k = 0 can be described equivalently in a conformal frame in which the spacetime is Minkowskian but all particle masses uniformly scale with epoch. In a Machian theory of gravity this spacetime dependence of mass is understood in terms of inertial interactions. This picture is shown to be more versatile than standard cosmology because it allows one to interpret objects of anomalously high redshift to be 'young' objects whose particle masses are lagging behind the universal mass function. We discuss here a variety of extragalactic phenomena within the framework of this model and show that these can be understood without recourse to adjustable parameters such as evolution, cosmological constant, etc.