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Combined constraints on modified Chaplygin gas model from cosmological observed data: Markov Chain Monte Carlo approach (1105.1870v1)

Published 10 May 2011 in astro-ph.CO

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, $\Omega_{b}h{2}=0.02263{+0.00184}_{-0.00162}$ ($1\sigma$) ${+0.00213}_{-0.00195}$ $(2\sigma)$, $B_{s}=0.7788{+0.0736}_{-0.0723}$ ($1\sigma$) ${+0.0918}_{-0.0904}$ $(2\sigma)$, $\alpha=0.1079{+0.3397}_{-0.2539}$ ($1\sigma$) ${+0.4678}_{-0.2911}$ $(2\sigma)$, $B=0.00189{+0.00583}_{-0.00756}$ ($1\sigma$) ${+0.00660}_{-0.00915}$ $(2\sigma)$, and $H_{0}=70.711{+4.188}_{-3.142}$ ($1\sigma$) ${+5.281}_{-4.149}$ $(2\sigma)$.

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