• Fulltext


        Click here to view fulltext PDF

      Permanent link:

    • Keywords


      RW space-time; cosmological constant-time variation; vacuum energy; active gravitational mass

    • Abstract


      The consequences of taking the total active gravitational mass of the universe phasewise constant together with a decaying vacuum energy in the background of Robertson-Walker space-time are investigated. The model so determined admits a contracted Ricci-collineation along the fluid flow vectorνi. It is geometrically closed but ever-expanding and does not possess the initial singularity, horizon, entropy, monopole or cosmological constant problems of the standard big bang cosmology. Estimates of the present matter; radiation and vacuum energy densities, the age of the universe and the present values of the deceleration parameter and the scale factor are also obtained.

    • Author Affiliations


      A B Dussattar1 R G Vishwakarma1

      1. Department of Mathematics, Banaras Hindu University, Varanasi - 221 005, India
    • Dates

  • Pramana – Journal of Physics | News

    • Editorial Note on Continuous Article Publication

      Posted on July 25, 2019

      Click here for Editorial Note on CAP Mode

© 2021-2022 Indian Academy of Sciences, Bengaluru.