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题名: Exploring the latest Union2 type Ia supernovae dataset by using model-independent parametrization methods
作者: Wang, SA ;  Li, XD ;  Li, MA
刊名: PHYSICAL REVIEW D
出版日期: 2011
卷号: 83, 期号:2, 页码:23010
关键词: BARYON ACOUSTIC-OSCILLATIONS ;  DARK ENERGY CONSTRAINTS ;  YANG-MILLS CONDENSATE ;  COSMOLOGICAL CONSTANT ;  LIGHT CURVES ;  CONSEQUENCES ;  QUINTESSENCE ;  EVOLUTION ;  EQUATION ;  UNIVERSE
学科分类: Physics
通讯作者: Wang, SA (reprint author), Univ Sci & Technol China, Dept Modern Phys, Hefei 230026, Peoples R China.
部门归属: [Wang, Shuang] Univ Sci & Technol China, Dept Modern Phys, Hefei 230026, Peoples R China; [Wang, Shuang; Li, Xiao-Dong; Li, Miao] Chinese Acad Sci, Inst Theoret Phys, Beijing 100190, Peoples R China; [Li, Xiao-Dong] Univ Sci & Technol China, Interdisciplinary Ctr Theoret Study, Hefei 230026, Peoples R China; [Li, Miao] Chinese Acad Sci, Kavli Inst Theoret Phys China, Beijing 100190, Peoples R China; [Li, Miao] Chinese Acad Sci, Key Lab Frontiers Theoret Phys, Beijing 100190, Peoples R China
英文摘要: We 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.
资助者: NSFC [10535060/A050207, 10821504]; Ministry of Science and Technology 973 program [2007CB815401]; USTC
收录类别: SCI
原文出处: 查看原文
语种: 英语
WOS记录号: WOS:000286802700004
Citation statistics: 
内容类型: 期刊论文
URI标识: http://ir.itp.ac.cn/handle/311006/14433
Appears in Collections:理论物理所2011年知识产出_期刊论文

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Recommended Citation:
Wang, SA,Li, XD,Li, MA. Exploring the latest Union2 type Ia supernovae dataset by using model-independent parametrization methods[J]. PHYSICAL REVIEW D,2011,83(2):23010.
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