Journal
MODERN PHYSICS LETTERS A
Volume 25, Issue 9, Pages 737-747Publisher
WORLD SCIENTIFIC PUBL CO PTE LTD
DOI: 10.1142/S0217732310032226
Keywords
Variable Chaplygin gas (VCG); decleration parameter; statefinder diagnostic
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Funding
- NSF [10573004]
- NSF of P.R. China [10703001]
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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.
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