ITP OpenIR  > 理论物理所科研产出  > SCI论文
Wang, SA; Li, XD; Li, MA; Wang, SA (reprint author), Univ Sci & Technol China, Dept Modern Phys, Hefei 230026, Peoples R China.
Exploring the latest Union2 type Ia supernovae dataset by using model-independent parametrization methods
Source PublicationPHYSICAL REVIEW D
Language英语
KeywordBaryon Acoustic-oscillations Dark Energy Constraints Yang-mills Condensate Cosmological Constant Light Curves Consequences Quintessence Evolution Equation Universe
AbstractWe explore the cosmological consequences of the recently released Union2 sample of 557 type Ia supernovae. Combining this latest type Ia supernovae dataset with the cosmic microwave background anisotropy data from the Wilkinson Microwave Anisotropy Probe 7-yr observations and the baryon acoustic oscillation results from the Sloan Digital Sky Survey data release 7, we measure the dark energy density function f(z) equivalent to rho(de)(z)/rho(de)(0) as a free function of redshift. Two model-independent parametrization methods (the binned parametrization and the polynomial interpolation parametrization) are used in this paper. By using the chi(2) statistic and the Bayesian information criterion, we find that the current observational data are still too limited to distinguish which parametrization method is better, and a simple model has the advantage in fitting observational data over a complicated model. Moreover, it is found that all these parametrizations demonstrate that the Union2 dataset is still consistent with a cosmological constant at 1 sigma confidence level. Therefore, the Union2 dataset is different from the Constitution type Ia supernovae dataset, which more favors a dynamical dark energy.
2011
ISSN1550-7998
Volume83Issue:2Pages:23010
Subject AreaPhysics
Indexed BySCI
Funding OrganizationNSFC [10535060/A050207, 10821504]; Ministry of Science and Technology 973 program [2007CB815401]; USTC ; NSFC [10535060/A050207, 10821504]; Ministry of Science and Technology 973 program [2007CB815401]; USTC ; NSFC [10535060/A050207, 10821504]; Ministry of Science and Technology 973 program [2007CB815401]; USTC ; NSFC [10535060/A050207, 10821504]; Ministry of Science and Technology 973 program [2007CB815401]; USTC
Citation statistics
Cited Times:34[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.itp.ac.cn/handle/311006/14433
Collection理论物理所科研产出_SCI论文
Corresponding AuthorWang, SA (reprint author), Univ Sci & Technol China, Dept Modern Phys, Hefei 230026, Peoples R China.
Recommended Citation
GB/T 7714
Wang, SA,Li, XD,Li, MA,et al. Exploring the latest Union2 type Ia supernovae dataset by using model-independent parametrization methods[J]. PHYSICAL REVIEW D,2011,83(2):23010.
APA Wang, SA,Li, XD,Li, MA,&Wang, SA .(2011).Exploring the latest Union2 type Ia supernovae dataset by using model-independent parametrization methods.PHYSICAL REVIEW D,83(2),23010.
MLA Wang, SA,et al."Exploring the latest Union2 type Ia supernovae dataset by using model-independent parametrization methods".PHYSICAL REVIEW D 83.2(2011):23010.
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