Combined constraints on modified Chaplygin gas model from cosmological observed data: Markov Chain Monte Carlo approach

Abstract

We use the Markov Chain Monte Carlo method to investigate a global constraints on the modified Chaplygin gas (MCG) model as the unification of dark matter and dark energy from the latest observational data: the Union2 dataset of type supernovae Ia (SNIa), the observational Hubble data (OHD), the cluster X-ray gas mass fraction, the baryon acoustic oscillation (BAO), and the cosmic microwave background (CMB) data. In a flat universe, the constraint results for MCG model are, ${\Omega }_b{h}^2=0.02263_{-0.00162}^{+0.00184}$ ($1\sigma$) ${}_{-0.00195}^{+0.00213}$ $(2\sigma )$, $B_s=0.7788_{-0.0723}^{+0.0736}$ ($1\sigma$) ${}_{-0.0904}^{+0.0918}$ $(2\sigma )$, $\alpha =0.1079_{-0.2539}^{+0.3397}$ ($1\sigma$) ${}_{-0.2911}^{+0.4678}$ $(2\sigma )$, $B=0.00189_{-0.00756}^{+0.00583}$ ($1\sigma$) ${}_{-0.00915}^{+0.00660}$ $(2\sigma )$, and $H_0=70.711_{-3.142}^{+4.188}$ ($1\sigma$) ${}_{-4.149}^{+5.281}$ $(2\sigma )$.

12 pages, 1figure

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