Accelerating Universe with binary mixture of bulk viscous fluid and dark energy

Abstract

In this paper, we have proposed a model of accelerating Universe with binary mixture of bulk viscous fluid and dark energy. and probed the model parameters: present values of Hubble's constant $H_0$, Equation of state paper of dark energy ${\omega }_{de}$ and density parameter of dark energy $({\Omega }_{de}{)}_0$ with recent OHD as well as joint Pantheon compilation of SN Ia data and OHD. Using cosmic chronometric technique, we obtain $H_0=69.80\pm 1.64km{s}^{-1}Mp{c}^{-1}$ and $70.0258\pm 1.72km{s}^{-1}Mp{c}^{-1}$ by restricting our derived model with recent OHD and joint Pantheon compilation SN Ia data and OHD respectively. The age of the Universe in derived model is estimated as $t_0=13.82\pm 0.33Gyrs$. Also, we observe that derived model represents a model of transitioning Universe with transition redshift $z_t=0.7286$. We have constrained the present value of jerk parameter as $j_0=0.969\pm 0.0075$ with joint OHD and Pantheon data. From this analysis, we observed that the model of the Universe, presented in this paper shows a marginal departure from $\Lambda$CDM model.

arXiv comment10 Pages, 7 Figures, Accepted in Int. J. Mod. Phys. A

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