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      Permanent link:
      https://www.ias.ac.in/article/fulltext/pram/047/01/0041-0055

    • 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

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      Posted on July 25, 2019

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