Modified Chaplygin Gas as a Unified Dark Matter and Dark Energy Model and Cosmic Constraints

Lixin Xu; Yuting Wang; Hyerim Noh

doi:10.1140/epjc/s10052-012-1931-3

paper

Modified Chaplygin Gas as a Unified Dark Matter and Dark Energy Model and Cosmic Constraints

arXiv:1204.5571 · doi:10.1140/epjc/s10052-012-1931-3

Abstract

A modified Chaplygin gas model (MCG), $ρ_{M C G} / ρ_{M C G 0} = [B_{s} + (1 - B_{s}) a^{- 3 (1 + B) (1 + α)}]^{1/ (1 + α)}$ , as a unified dark matter model and dark energy model is constrained by using current available cosmic observational data points which include type Ia supernovae, baryon acoustic oscillation and the seventh year full WMAP data points. As a contrast to the consideration in the literatures, we {\it do not} separate the MCG into two components, i.e. dark mater and dark energy component, but we take it as a whole energy component-a unified dark sector. By using Markov Chain Monte Carlo method, a tight constraint is obtained: $α = 0.00072 7_{- 0.00140 - 0.00234}^{+ 0.00142 + 0.00391}$ , $B = 0.00077 7_{- 0.000302 - 0.000697}^{+ 0.000201 + 0.000915}$ and $B_{s} = 0.78 2_{- 0.0162 - 0.0329}^{+ 0.0163 + 0.0307}$ .}

arXiv comment6 pages, 3 figures

Modified Chaplygin Gas as a Unified Dark Matter and Dark Energy Model and Cosmic Constraints

Abstract

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