Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
10722488 | Physics Letters B | 2008 | 5 Pages |
Abstract
In this Letter, a modified Chaplygin gas (MCG) model of unifying dark energy and dark matter with the exotic equation of state pMCG=BÏMCGâAÏMCGα is constrained from recently observed data: the 182 Gold SNe Ia, the 3-year WMAP and the SDSS baryon acoustic peak. It is shown that the best fit value of the three parameters (B,Bs,α) in MCG model are (â0.085,0.822,1.724). Furthermore, we find the best fit w(z) crosses â1 in the past and the present best fit value w(0)=â1.114<â1, and the 1Ï confidence level of w(0) is â0.946⩽w(0)⩽â1.282. Finally, we find that the MCG model has the smallest Ïmin2 value in all eight given models. According to the Akaike Information Criterion (AIC) of model selection, we conclude that recent observational data support the MCG model as well as other popular models.
Related Topics
Physical Sciences and Engineering
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Nuclear and High Energy Physics
Authors
Jianbo Lu, Lixin Xu, Jiechao Li, Baorong Chang, Yuanxing Gui, Hongya Liu,