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论文类型：期刊论文

发表时间：2008-08-20

发表刊物：MODERN PHYSICS LETTERS A

收录刊物：SCIE、Scopus

卷号：23

期号：25

页面范围：2067-2076

ISSN号：0217-7323

关键字：modified Chaplygin gas (MCG); dark energy; transition redshift; deceleration parameter

摘要：In this paper, the 1 sigma confidence level of transition redshift and present deceleration parameter are studied using modified Chaplygin gas (MCG) model from recent observations: the 182 Gold SNe Ia, three-year WMAP, SDSS baryon acoustic peak and X-ray gas mass fraction in clusters. Concretely, the best fit values of the transition redshift and present deceleration parameter with the 1 sigma confidence level are z(T) = 0.45(-0.09)(+0.19) and q(0) = -0.64(-0.15)(+0.15), which indicate the best fit values of z(T) and q(0) for MCG case are surprisingly close to the central values given by Refs. 20 and 21. Furthermore, we plot the evolution of cosmological quantities from MCG model by using the best-fit parameters given by combining constraint, and compare them with Lambda CDM model.