Fitting the constitution type Ia supernova data with the redshift-binned parametrization method
文献类型：期刊论文
| 作者 | Huang, Qing-Guo ; Li, Miao; Li, Xiao-Dong; Wang, Shuang; Huang, QG , Korea Inst Adv Study, Sch Phys, Seoul 130722, South Korea
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| 刊名 | PHYSICAL REVIEW D
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| 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 |
| ISSN号 | 1550-7998 |
| 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. |
| 学科主题 | Physics |
| URL标识 | 查看原文 |
| WOS记录号 | WOS:000271353700030 |
| 公开日期 | 2012-08-02 |
| 源URL | [http://ir.itp.ac.cn/handle/311006/5230]  |
| 专题 | 理论物理研究所_理论物理所1978-2010年知识产出 |
| 通讯作者 | Huang, QG , Korea Inst Adv Study, Sch Phys, Seoul 130722, South Korea |
| 推荐引用方式 GB/T 7714 | 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):-. |
| APA | Huang, Qing-Guo,Li, Miao,Li, Xiao-Dong,Wang, Shuang,&Huang, QG , Korea Inst Adv Study, Sch Phys, Seoul 130722, South Korea.(2009).Fitting the constitution type Ia supernova data with the redshift-binned parametrization method.PHYSICAL REVIEW D,80(8),-. |
| MLA | Huang, Qing-Guo,et al."Fitting the constitution type Ia supernova data with the redshift-binned parametrization method".PHYSICAL REVIEW D 80.8(2009):-. |
入库方式： OAI收割
来源：理论物理研究所
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