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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)
AbstractIn 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.
Keywordsupernova type Ia - standard candles dark energy experiments dark energy theory
Subject AreaAstronomy & Astrophysics; Physics
Indexed BySCI ; ADS
WOS IDWOS:000341848800030
ADS Bibcode2014JCAP...08..030Z
ADS URLhttps://ui.adsabs.harvard.edu/abs/2014JCAP...08..030Z
ADS CITATIONShttps://ui.adsabs.harvard.edu/abs/2014JCAP...08..030Z/citations
Citation statistics
Cited Times:7 [ADS]
Document Type期刊论文
Recommended Citation
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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