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

2012/04/25 by Lixin Xu, Yuting Wang, Hyerim Noh · 1 citation
Physics and Astronomy · #astro-ph.CO

paper · pdf · doi:10.1140/epjc/s10052-012-1931-3

published as Eur. Phys. J. C (2012) 72:1931 · 6 pages, 3 figures

arxiv created 2012/04/25 · arxiv updated 2012/04/26

Abstract

A modified Chaplygin gas model (MCG), ρ_MCG/ρ_MCG0=[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= 0.000727_{- 0.00140- 0.00234}^{+ 0.00142+ 0.00391}, B=0.000777_{- 0.000302- 0.000697}^{+ 0.000201+ 0.000915} and B_s= 0.782_{- 0.0162- 0.0329}^{+ 0.0163+ 0.0307} .

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