Eur. Phys. J. C (2009) 63: 349-354
https://doi.org/10.1140/epjc/s10052-009-1118-8

Letter

Observational constraint on generalized Chaplygin gas model

School of Physics and Optoelectronic Technology, Dalian University of Technology, Dalian, 116024, People’s Republic of China

^* e-mail: lvjianbo819@163.com

Received: 4 January 2009
Revised: 17 June 2009
Published online: 26 August 2009

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 (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.