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论文类型：期刊论文

发表时间：2012-03-01

发表刊物：EUROPEAN PHYSICAL JOURNAL C

收录刊物：SCIE、Scopus

卷号：72

期号：3

页面范围：1-6

ISSN号：1434-6044

摘要：A modified Chaplygin gas model ( MCG), rho(MCG)/rho(MCG0) = [ B-s + ( 1 - B-s)a(-3(1+B)(1+alpha))](1/(1+alpha)), as a unified dark matter model and dark energy model, is constrained by using current available cosmic observational data points which include type Ia supernovae, baryon acoustic oscillation and the 7-year full WMAP data points. As a contrast to the consideration in the literature, we do not separate the MCG into two components, i.e. dark mater and dark energy component, but we take it as a whole energy component-a unified dark sector. By using a Markov Chain Monte Carlo method, a tight constraint is obtained: alpha = 0.000727(-0.00140-0.00234)(+0.00142+0.00391), B = 0.000777(-0.000302-0.000697)(+0.000201+0.000915) and B-s = 0.782(-0.0162-0.0329)(+0.0163+0.0307).