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Constraints on the unified dark energy-dark matter model from latest observational data | | Puxun Wu
; Hongwei Yu
; | | Date: |
16 Jan 2007 | | Abstract: | 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 and the distance ratio from $z=0.35$ to $z=1089$ (the redshift of decoupling). Our results rule out the Chaplygin gas model ($alpha=1$) at the 99.7% confidence level and the $lambda CDM$ model ($alpha=0$) at the 68.3% confidence level. At a 95.4% confidence level, we obtain $w=-0.70_{-0.13}^{+0.12}$ and $alpha=-0.27_{-0.30}^{+0.49}$. In addition, we find that the phase transition from deceleration to acceleration occurs at redshift $z_{q=0}sim 0.89-1.0$ at a $1sigma$ confidence level for the GCG model. | | Source: | arXiv, astro-ph/0701446 | | Services: | Forum | Review | PDF | Favorites | |
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