Release Time:2019-03-09  Hits:

Indexed by: Journal Article

Date of Publication: 2012-03-01

Journal: EUROPEAN PHYSICAL JOURNAL C

Included Journals: Scopus、SCIE

Volume: 72

Issue: 3

Page Number: 1-6

ISSN: 1434-6044

Abstract: 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).