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

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

2012-04-25

arxiv.org/abs/1204.5571v1

Eur. Phys. J. C (2012) 72:1931

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

6 pages, 3 figures

Scientific paper

10.1140/epjc/s10052-012-1931-3

A modified Chaplygin gas model (MCG), $\rho_{MCG}/\rho_{MCG0}=[B_{s}+(1-B_{s})a^{-3(1+B)(1+\alpha)}]^{1/(1+\alpha)}$, 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: $\alpha= 0.000727_{- 0.00140- 0.00234}^{+ 0.00142+ 0.00391}$, $B=0.000777_{- 0.000302- 0.000697}^{+ 0.000201+ 0.000915}$ and $B_s= 0.782_{- 0.0162- 0.0329}^{+ 0.0163+ 0.0307}$ .}

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