Cosmological constraints on alternative model to Chaplygin fluid revisited

Abstract

In this work we explore an alternative phenomenological model to Chaplygin gas proposed by H. Hova et. al., consisting on a modification of a perfect fluid, to explain the dynamics of dark matter and dark energy at cosmological scales immerse in a flat or curved universe. Adopting properties similar to a Chaplygin gas, the proposed model is a mixture of dark matter and dark energy components parameterized by only one free parameter denoted as $\mu$. We focus on contrasting this model with the most recent cosmological observations of Type Ia Supernovae and Hubble parameter measurements. Our joint analysis yields a value $\mu =0.843_{-0.015}^{+0.014}$ ($0.822_{-0.024}^{+0.022}$) for a flat (curved) universe. Furthermore, with these constraints we also estimate the deceleration parameter today $q_0=-0.67\pm 0.02(-0.51\pm 0.07)$, the acceleration-deceleration transition redshift $z_t=0.57\pm 0.04(0.50\pm 0.06)$, and the universe age $t_A=13.108_{-0.260}^{+0.270}\times (12.314_{-0.430}^{+0.590})$Gyrs. We also report a best value of ${\Omega }_k=0.183_{-0.079}^{+0.073}$ consistent at $3\sigma$ with the one reported by Planck Collaboration. Our analysis confirm the results by Hova et al, this Chaplygin gas-like is a plausible alternative to explain the nature of the dark sector of the universe.

arXiv commentAccepted for publication in EPJ C

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