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constraintsongeneralizedchaplygingasmodelincludinggammaraybursts
FaYin Wang1; ZiGao Dai1; Shi Qi2
2009
Source Publicationresearchinastronomyandastrophysics
ISSN1674-4527
Volume9Issue:5Pages:547
AbstractGeneralized Chaplygin gas (whose equation of state is p(GCG) = -A/rho(alpha)(GCG)) G was proposed as a candidate for unification of dark energy and dark matter. We investigate constraints on this model with the latest observed data. We test the model with type-la supernovae (SNe Ia), cosmic microwave background (CMB) anisotropy, X-ray gas mass fractions in clusters, and gamma-ray bursts (GRBs). We calibrate the GRB luminosity relations without assuming any cosmological models using SNe Ia. We show that GRBs can extend the Hubble diagram to higher redshifts (z > 6). The GRB Hubble diagram is well behaved and delineates the shape of the Hubble diagram well. We measure A(s) equivalent to A/rho(alpha+1)(GCG,0) = 0.68(-0.08)(+0.04) (where rho(GCG,0) is the energy density today) and alpha = 0.22(-0.13)(+0.15) at the sigma confidence level using all the datasets. Our results rule out the standard Chaplygin gas model (alpha = 1) at the 3 sigma confidence level. The Lambda CDM is allowed at the 2 sigma confidence level. We find that acceleration could have started at a redshift of z similar to 0.70. The concordance of the generalized Chaplygin gas model with the age estimate of an old high redshift quasar is found. In addition, we show that GRBs can break the degeneracy between the generalized Chaplygin gas model and the XCDM model.
Language英语
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/31910
Collection中国科学院紫金山天文台
Affiliation1.南京大学
2.中国科学院紫金山天文台
Recommended Citation
GB/T 7714
FaYin Wang,ZiGao Dai,Shi Qi. constraintsongeneralizedchaplygingasmodelincludinggammaraybursts[J]. researchinastronomyandastrophysics,2009,9(5):547.
APA FaYin Wang,ZiGao Dai,&Shi Qi.(2009).constraintsongeneralizedchaplygingasmodelincludinggammaraybursts.researchinastronomyandastrophysics,9(5),547.
MLA FaYin Wang,et al."constraintsongeneralizedchaplygingasmodelincludinggammaraybursts".researchinastronomyandastrophysics 9.5(2009):547.
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