Liang 2010 用伽马暴限制generalized Chaplygin gas (GCG) model

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Title:		Constraints on Generalized Chaplygin gas model including Gamma-ray bursts Via Markov Chain Monte Carlo approach
Authors:		Liang, Nan; Xu, Lixin; Zhu, Zong-Hong
Publication:		eprint arXiv:1009.6059
Publication Date:		09/2010
Origin:		ARXIV
Keywords:		Astrophysics - Cosmology and Extragalactic Astrophysics
Comment:		11 pages, 2 figures, 1 table
Bibliographic Code:		2010arXiv1009.6059L

Abstract

We investigate observational constraints on the generalized Chaplygin gas (GCG) model by using the Markov Chain Monte Carlo method. With the cosmology-independent Gamma-ray bursts (GRBs) at high redshift, as well as the Union2 Type Ia supernovae (SNe Ia) set, the cosmic microwave background (CMB) observation from the Wilkinson Microwave Anisotropy Probe (WMAP7) result, and the baryonic acoustic oscillation (BAO) observation from the spectroscopic Sloan Digital Sky Survey (SDSS) Data Release 7 (DR7) galaxy sample, the best-fit values of the GCG model parameters are The best-fit values of the GCG model parameters are $A_S$=$0.7475_{-0.0539}^{+0.0556}(1\sigma)_{-0.0816}^{+0.0794}(2\sigma)$, $\alpha$=$-0.0256_{-0.1326}^{+0.1760}(1\sigma)_{-0.1907}^{+0.2730}(2\sigma)$, with the effective matter density $\Omega_{m}=0.2628_{-0.0153}^{+0.0155}(1\sigma)_{-0.0223}^{+0.0236}(2\sigma)$, which are more stringent than the previous results for constraint on GCG model parameters.

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