Observational constraint on generalized Chaplygin gas model
School of Physics and Optoelectronic Technology, Dalian University of Technology, Dalian, 116024, People’s Republic of China
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Revised: 17 June 2009
Published online: 26 August 2009
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 (1σ) −0.09 +0.09 (2σ), α=−0.09 −0.12 +0.15 (1σ) −0.19 +0.26 (2σ). 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 1σ confidence level −0.91≥w 0de≥−1.00.
© Springer-Verlag , 2009