Constraints on modified Chaplygin gas from recent observations and a comparison of its status with other models

Abstract

In this Letter, a modified Chaplygin gas (MCG) model of unifying dark energy and dark matter with the exotic equation of state $p_{MCG}=B{\rho }_{MCG}-\frac{A}{{\rho }_{MCG}^{\alpha }}$ 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 ($B$,$B_s$,$\alpha$) in MCG model are (-0.085,0.822,1.724). Furthermore, we find the best fit $w(z)$ crosses -1 in the past and the present best fit value $w(0)=-1.114<-1$, and the $1\sigma$ confidence level of $w(0)$ is $-0.946\le w(0)\le -1.282$. Finally, we find that the MCG model has the smallest ${\chi }_{min}^2$ value in all eight given models. According to the Alaike Information Criterion (AIC) of model selection, we conclude that recent observational data support the MCG model as well as other popular models.

8 pages, 1 figure

References in corpus (3)

• Wilkinson Microwave Anisotropy Probe (WMAP) Three Year Results: Implications for Cosmology
• WMAP constraints on low redshift evolution of dark energy
• Top ten accelerating cosmological models

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• Fitting cosmological data to the function $q(z)$ from GR Theory: Modified Chaplygin Gas
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