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Constraints on generalized Chaplygin gas model including gamma-ray bursts
Wang, Fa-Yin1; Dai, Zi-Gao1; Qi, Shi2,3
2009-05-01
Source PublicationRESEARCH IN ASTRONOMY AND ASTROPHYSICS
Volume9Issue:5Pages:547-557
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.
KeywordGamma-rays: Bursts Cosmology: Theory
WOS HeadingsScience & Technology ; Physical Sciences
WOS KeywordPROBE WMAP OBSERVATIONS ; EQUATION-OF-STATE ; RELAXED GALAXY CLUSTERS ; DARK ENERGY ; COSMOLOGICAL CONSTANT ; IA SUPERNOVAE ; OBSERVATIONAL CONSTRAINTS ; ACCELERATING UNIVERSE ; ABSORPTION SYSTEMS ; HUBBLE CONSTANT
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000266398200006
Citation statistics
Cited Times:12[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/15939
Collection南极天文中心
Affiliation1.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
Recommended Citation
GB/T 7714
Wang, Fa-Yin,Dai, Zi-Gao,Qi, Shi. Constraints on generalized Chaplygin gas model including gamma-ray bursts[J]. RESEARCH IN ASTRONOMY AND ASTROPHYSICS,2009,9(5):547-557.
APA Wang, Fa-Yin,Dai, Zi-Gao,&Qi, Shi.(2009).Constraints on generalized Chaplygin gas model including gamma-ray bursts.RESEARCH IN ASTRONOMY AND ASTROPHYSICS,9(5),547-557.
MLA Wang, Fa-Yin,et al."Constraints on generalized Chaplygin gas model including gamma-ray bursts".RESEARCH IN ASTRONOMY AND ASTROPHYSICS 9.5(2009):547-557.
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