Constraints on dark energy from new observations including Pan-STARRS
文献类型：期刊论文
| 作者 | Zheng W(郑伟) ; Zhang, W; Li, SY; Li, H; Xia, JQ; Li, MZ; Lu, T;; Li H(李虹); Xia JQ(夏俊卿); Li SY(李思宇)
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| 刊名 | JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
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| 出版日期 | 2014 |
| 期号 | 8页码:30 |
| 关键词 | supernova type Ia - standard candles dark energy experiments dark energy theory |
| 英文摘要 | In this paper, we set the new limits on the equation of state parameter (EoS) of dark energy with the observations of cosmic microwave background radiation (CMB) from Planck satellite, the type Ia supernovae from Pan-STARRS and the baryon acoustic oscillation (BAO). We consider two parametrization forms of EoS: a constant w and time evolving w(a) = w(0) + w(a)(1 - a). The results show that with a constant EoS, w = -1.141 +/- 0.075 (68% C.L.), which is consistent with ACDM at about 2 sigma confidence level. For a time evolving w(a) model, we get w(0) = -1.09(-0.18)(+0.16) (l sigma C.L.), w(a) = -0.34(-0.51)(+0.87) (l sigma C.L.), and in this case ACDM can be comparable with our observational data at l sigma confidence level. In order to do the parametrization independent analysis, additionally we adopt the so called principal component analysis (PCA) method, in which we divide redshift range into several bins and assume w as a constant in each redshift bin (bin-w). In such bin-w scenario, we find that for most of the bins cosmological constant can be comparable with the data, however, there exists few bins which give w deviating from ACDM at more than 2 sigma confidence level, which shows a weak hint for the time evolving behavior of dark energy. To further confirm this hint, we need more data with higher precision. |
| 学科主题 | Astronomy & Astrophysics; Physics |
| 收录类别 | SCI |
| WOS记录号 | WOS:000341848800030 |
| 公开日期 | 2016-05-03 |
| 源URL | [http://ir.ihep.ac.cn/handle/311005/225074]  |
| 专题 | 高能物理研究所_粒子天体物理中心 |
| 推荐引用方式 GB/T 7714 | Zheng W,Zhang, W,Li, SY,et al. Constraints on dark energy from new observations including Pan-STARRS[J]. JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS,2014(8):30. |
| APA | 郑伟.,Zhang, W.,Li, SY.,Li, H.,Xia, JQ.,...&李思宇.(2014).Constraints on dark energy from new observations including Pan-STARRS.JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS(8),30. |
| MLA | 郑伟,et al."Constraints on dark energy from new observations including Pan-STARRS".JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS .8(2014):30. |
入库方式： OAI收割
来源：高能物理研究所
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