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      Permanent link:
      https://www.ias.ac.in/article/fulltext/pram/094/0135

    • Keywords

       

      Bulk viscosity; f (R, T ) gravity; accelerating Universe; deceleration parameter.

    • Abstract

       

      In this paper, we propose that the late-time acceleration of the Universe is due to bulk viscous fluid and trace of energy–momentum tensor $T$ in $f (R, T )$ theory of gravity. We assume that $f (R, T ) = f (R)+2 f (T )$ with $f (R) = R$ and $f (T ) = \lambda T$ where $\lambda$ is a constant, $R$ and $T$ are the Ricci scalar and trace of energy–momentum tensor. First, we obtain an exact solution of the bulk viscous Universe in $f (R, T )$ gravity, then we use observational Hubble data (OHD), the baryon acoustic oscillation (BAO) distance ratio data as well as SN Ia data to constrain the parameters of the derived bulk viscous Universe. Our estimations show that in the model under consideration $H_{0} = 69.089$ km/Mpc/s which is in good agreement with recent astrophysical observations. We ascertain the present age of the derived Universe as well as the signature flipping behaviour of deceleration parameter. Some physical properties of the derived model are also discussed.

    • Author Affiliations

       

      R PRASAD1 LALIT KUMAR GUPTA2 G K GOSWAMI3 ANIL KUMAR YADAV4

      1. Department of Physics, Galgotias College of Engineering and Technology, Greater Noida 201 310, India
      2. Department of Physics, Krishna Engineering College, Ghaziabad 201 007, India
      3. Department of Mathematics, Netaji Subhas University of Technology, Delhi 110 078, India
      4. Department of Physics, United College of Engineering and Research, Greater Noida 201 310, India
    • Dates

       
  • Pramana – Journal of Physics | News

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