Constraints on the unified dark energy-dark matter model from latest observational data

Details Constraints on the unified dark energy-dark matter model from latest observational data Constraints on the unified dark energy-dark matter model from latest observational data

2007-01-16

arxiv.org/abs/astro-ph/0701446v3

JCAP 0703:015,2007

Astronomy and Astrophysics

Astrophysics

12 pages, 4 figures,accepted for publication in JCAP

Scientific paper

10.1088/0256-307X/24/3/071

The generalized Chaplygin gas (GCG), is studied in this paper by using the latest observational data including 182 gold sample type Ia supernovae (Sne Ia) data, the ESSENCE Sne Ia data, the distance ratio from $z=0.35$ to $z=1089$ (the redshift of decoupling), the CMB shift parameter and the Hubble parameter data. Our results rule out the standard Chaplygin gas model ($\alpha=1$) at the 99.7% confidence level, but allow for the $\lambda CDM$ model ($\alpha=0$) at the 68.3% confidence level. At a 95.4% confidence level, we obtain $w=-0.74_{-0.09}^{+0.10}$ and $\alpha=-0.14_{-0.19}^{+0.30}$. In addition, we find that the phase transition from deceleration to acceleration occurs at redshift $z_{q=0}\sim 0.78-0.89$ at a $1\sigma$ confidence level for the GCG model.

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