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题名: Constraints on generalized Chaplygin gas model including gamma-ray bursts
作者: Wang, Fa-Yin1; Dai, Zi-Gao1; Qi Shi(祈石)2, 3
刊名: RESEARCH IN ASTRONOMY AND ASTROPHYSICS
出版日期: 2009-05-01
卷号: 9, 期号:5, 页码:547-557
关键词: gamma-rays: bursts ; cosmology: theory
文章类型: Article
英文摘要: Generalized 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.
WOS标题词: Science & Technology ; Physical Sciences
类目[WOS]: Astronomy & Astrophysics
研究领域[WOS]: Astronomy & Astrophysics
关键词[WOS]: PROBE WMAP OBSERVATIONS ; EQUATION-OF-STATE ; RELAXED GALAXY CLUSTERS ; DARK ENERGY ; COSMOLOGICAL CONSTANT ; IA SUPERNOVAE ; OBSERVATIONAL CONSTRAINTS ; ACCELERATING UNIVERSE ; ABSORPTION SYSTEMS ; HUBBLE CONSTANT
收录类别: SCI
语种: 英语
WOS记录号: WOS:000266398200006
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内容类型: 期刊论文
URI标识: http://libir.pmo.ac.cn/handle/332002/15939
Appears in Collections:南极天文中心_期刊论文

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作者单位: 1.Nanjing Univ, Dept Astron, Nanjing 210093, Peoples R China
2.Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Peoples R China
3.Nanjing Univ, Purple Mt Observ, Joint Ctr Particle Nucl Phys & Cosmol, Nanjing 210093, Peoples R China
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