Observational constraints on generalized Chaplygin gas model

Details Observational constraints on generalized Chaplygin gas model Observational constraints on generalized Chaplygin gas model

2004-11-10

arxiv.org/abs/astro-ph/0411253v1

JCAP0503:007,2005

Astronomy and Astrophysics

Astrophysics

5 pages, 3 figures, use revtex

Scientific paper

10.1088/1475-7516/2005/03/007

The generalized Chaplygin gas model with parameter space $\alpha>-1$ is studied in this paper. Some reasonable physical constraints are added to justify the use of the larger parameter space. The Type Ia supernova data and age data of some clusters are then used to fit the model. We find that the parameters have bimodal distributions. For the generalized Chaplygin gas model, we also find that less free parameters fit the data better. The best fit model is the spatially flat model with baryons. The best fit parameters are: $\Omega_{m0}=0.044$, $w_{c0}=-0.881$ and $\alpha=1.57$. The transition redshift is $z_T=0.395$.

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