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Constraints on dark energy from new observations including Pan-STARRS
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)
2014
发表期刊JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
期号8页码:30
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.
关键词supernova type Ia - standard candles dark energy experiments dark energy theory
学科领域Astronomy & Astrophysics; Physics
DOI10.1088/1475-7516/2014/08/030
收录类别SCI
WOS记录号WOS:000341848800030
引用统计
文献类型期刊论文
条目标识符http://ir.ihep.ac.cn/handle/311005/225074
专题粒子天体物理中心
理论物理室
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.
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