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Indexed by:期刊论文

Date of Publication:2010-03-21

Journal:MODERN PHYSICS LETTERS A

Included Journals:SCIE

Volume:25

Issue:9

Page Number:737-747

ISSN No.:0217-7323

Key Words:Variable Chaplygin gas (VCG); decleration parameter; statefinder diagnostic

Abstract:We apply the type Ia supernovae union dataset and the baryon acoustic oscillations data at z = 0.2 and z = 0.35 to constrain variable Chaplygin gas (VCG) model as the unification of dark matter and dark energy. It is shown that the confidence levels for VCG model parameters are B(s) = 0.075(0.013)(+0.016)(1 sigma) (+0.026)(0.020)(2 sigma), n = 1.30(0.049)(+0.46) (1 sigma) (+0.74)(-0.81)(2 sigma) . And it indicates that the values of transition redshift and current deceleration parameter are: z(T) = 0.74(-0.05)(+0.05) (1 sigma), q(0) = -0.54(-0.07)(+0.07)(1 sigma). In addition, we plot the evolution trajectory of the VCG model in the statefinder parameter r-s plane and show the discrimination between this scenario and other dark energy models.