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题名: Fitting the constitution type Ia supernova data with the redshift-binned parametrization method
作者: Huang, Qing-Guo ;  Li, Miao ;  Li, Xiao-Dong ;  Wang, Shuang
刊名: PHYSICAL REVIEW D
出版日期: 2009
卷号: 80, 期号:8, 页码:-
关键词: ANISOTROPY-PROBE OBSERVATIONS ;  DARK ENERGY CONSTRAINTS ;  YANG-MILLS CONDENSATE ;  COSMOLOGICAL CONSTANT ;  LIGHT CURVES ;  MODEL ;  CONSEQUENCES ;  QUINTESSENCE ;  EVOLUTION ;  EQUATION
学科分类: Physics
通讯作者: Huang, QG , Korea Inst Adv Study, Sch Phys, Seoul 130722, South Korea
部门归属: [Huang, QG] Korea Inst Adv Study, Sch Phys, Seoul 130722, South Korea; [Huang, QG; Li, M] Chinese Acad Sci, Kavli Inst Theoret Phys China, Beijing 100190, Peoples R China; [Li, M; Li, XD; Wang, S] Chinese Acad Sci, Inst Theoret Phys, Key Lab Frontiers Theoret Phys, Beijing 100190, Peoples R China; [Li, XD] Univ Sci & Technol China, Interdisciplinary Ctr Theoret Study, Hefei 230026, Peoples R China; [Wang, S] Univ Sci & Technol China, Dept Modern Phys, Hefei 230026, Peoples R China
英文摘要: In this work, we explore the cosmological consequences of the recently released Constitution sample of 397 Type Ia supernovae (SNIa). By revisiting the Chevallier-Polarski-Linder (CPL) parametrization, we find that, for fitting the Constitution set alone, the behavior of dark energy (DE) significantly deviates from the cosmological constant Lambda, where the equation of state (EOS) w and the energy density rho(Lambda) of DE will rapidly decrease along with the increase of redshift z. Inspired by this clue, we separate the redshifts into different bins, and discuss the models of a constant w or a constant rho(Lambda) in each bin, respectively. It is found that for fitting the Constitution set alone, w and rho(Lambda) will also rapidly decrease along with the increase of z, which is consistent with the result of CPL model. Moreover, a step function model in which rho(Lambda) rapidly decreases at redshift z similar to 0: 331 presents a significant improvement (Delta chi(2) = -4.361) over the CPL parametrization, and performs better than other DE models. We also plot the error bars of DE density of this model, and find that this model deviates from the cosmological constant Lambda at 68.3% confidence level (CL); this may arise from some biasing systematic errors in the handling of SNIa data, or more interestingly from the nature of DE itself. In addition, for models with same number of redshift bins, a piecewise constant rho(Lambda) model always performs better than a piecewise constant w model; this shows the advantage of using rho(Lambda), instead of w, to probe the variation of DE.
资助者: NSFC[10535060/A050207, 10821504]; Ministry of Science and Technology[2007CB815401]
收录类别: SCI
原文出处: 查看原文
WOS记录号: WOS:000271353700030
Citation statistics: 
内容类型: 期刊论文
URI标识: http://ir.itp.ac.cn/handle/311006/5230
Appears in Collections:理论物理所1978-2010年知识产出_期刊论文

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Recommended Citation:
Huang, Qing-Guo,Li, Miao,Li, Xiao-Dong,et al. Fitting the constitution type Ia supernova data with the redshift-binned parametrization method[J]. PHYSICAL REVIEW D,2009,80(8):-.
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