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Indexed by:期刊论文

Date of Publication:2009-10-01

Journal:EUROPEAN PHYSICAL JOURNAL C

Included Journals:SCIE、Scopus

Volume:63

Issue:3

Page Number:349-354

ISSN No.:1434-6044

Abstract:We investigate observational constraints on the generalized Chaplygin gas (GCG) model as the unification of dark matter and dark energy from the latest observational data: the Union SNe Ia data, the observational Hubble data, the SDSS baryon acoustic peak and the five-year WMAP shift parameter. The result is obtained that the best-fit values of the GCG model parameters with their confidence level are A(s) = 0.73(-0.06)(+0.06) (1 sigma) (+0.09)(-0.09) (2 sigma), alpha = -0.19(-0.12)(+0.15) (1 sigma) (+0.26)(-0.19) (2 sigma). Furthermore, in this model, we can see that the evolution of equation of state (EOS) for dark energy is similar to quiessence, and its current best-fit value is w(0de) = -0.96 with the 1 sigma confidence level -0.91 >= w(0de) >= -1.00.