Time-varying dark energy constraints from the latest SN Ia, BAO and SGL
文献类型：期刊论文
| 作者 | Zhang, Qing-Jun; Wu, Yue-Liang ; Zhang, QJ , Chinese Acad Sci, Inst Theoret Phys, Key Lab Frontiers Theoret Phys, Kavli Inst Theoret Phys China, Zhong Guan Cun E St 55, Beijing 100190, Peoples R China
|
| 刊名 | JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
 |
| 出版日期 | 2010 |
| 期号 | 8页码:- |
| 关键词 | Hubble-space-telescope Digital Sky Survey Cosmological Consequences Distant Supernovae Data Set Constant Models Peak Component Matter |
| ISSN号 | 1475-7516 |
| 英文摘要 | Based on the latest SNe Ia data provided by Hicken et al. (2009) with using MLCS17 light curve fitter, together with the Baryon Acoustic Oscillation (BAO) and strong gravitational lenses (SGL), we investigate the constraints on the dark energy equation-of-state parameter w in the flat universe, especially for the time-varying case w(z) = w(0) + w(z)z/(1+z). The constraints from SNe data alone are found to be: (a) (Omega(M), w) = (0.358, -1.09) as the best-fit results; (b) (w(0), w(z)) = (-0.73(-0.97)(+0.23), 0.84(-10.34)(+1.66)) for the two parameters in the time-varying case after marginalizing the parameter Omega(M); (c) the likelihood of parameter w(z) has a high non-Gaussian distribution; (d) an extra restriction on Omega(M) is necessary to improve the constraint of the SNe Ia data on the parameters (w(0), w(z)). A joint analysis of SNe Ia data and BAO is made to break the degeneracy between w and Omega(M), and leads to the interesting maximum likelihoods w(0) = -0.94 and w(z) = 0. When marginalizing the parameter Omega(M), the fitting results are found to be (w(0), w(z)) = (-0.95(-0.18)(+0.45), 0.41(-0.96)(+0.79)). After adding the splitting angle statistic of SGL data, a consistent constraint is obtained (Omega(M), w) = (0.298, -0.907) and the constraints on time-varying dark energy are further improved to be (w(0), w(z)) = (-0.92(-0.10)(+0.14), 0.35(-0.54)(+0.47)), which indicates that the phantom type models are disfavored. |
| 学科主题 | Physics |
| URL标识 | 查看原文 |
| WOS记录号 | WOS:000283575000002 |
| 公开日期 | 2012-08-02 |
| 源URL | [http://ir.itp.ac.cn/handle/311006/5068]  |
| 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 | Zhang, QJ , Chinese Acad Sci, Inst Theoret Phys, Key Lab Frontiers Theoret Phys, Kavli Inst Theoret Phys China, Zhong Guan Cun E St 55, Beijing 100190, Peoples R China |
| 推荐引用方式 GB/T 7714 | Zhang, Qing-Jun,Wu, Yue-Liang,Zhang, QJ , Chinese Acad Sci, Inst Theoret Phys, Key Lab Frontiers Theoret Phys, Kavli Inst Theoret Phys China, Zhong Guan Cun E St 55, Beijing 100190, Peoples R China. Time-varying dark energy constraints from the latest SN Ia, BAO and SGL[J]. JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS,2010(8):-. |
| APA | Zhang, Qing-Jun,Wu, Yue-Liang,&Zhang, QJ , Chinese Acad Sci, Inst Theoret Phys, Key Lab Frontiers Theoret Phys, Kavli Inst Theoret Phys China, Zhong Guan Cun E St 55, Beijing 100190, Peoples R China.(2010).Time-varying dark energy constraints from the latest SN Ia, BAO and SGL.JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS(8),-. |
| MLA | Zhang, Qing-Jun,et al."Time-varying dark energy constraints from the latest SN Ia, BAO and SGL".JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS .8(2010):-. |
入库方式： OAI收割
来源：理论物理研究所
浏览0
下载0
收藏0
其他版本
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。