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题名: Constraints on dark energy from new observations including Pan-STARRS
作者: Zhang, Wei1, 2, 7; Li, Si-Yu3; Li, Hong2, 4; Xia, Jun-Qing2; Li, Mingzhe5; Lu Tan(陆埮)6, 7
刊名: JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
出版日期: 2014-08-01
期号: 8
关键词: supernova type Ia - standard candles ; dark energy experiments ; dark energy theory
DOI: 10.1088/1475-7516/2014/08/030
文章类型: Article
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.
WOS标题词: Science & Technology ; Physical Sciences
类目[WOS]: Astronomy & Astrophysics ; Physics, Particles & Fields
研究领域[WOS]: Astronomy & Astrophysics ; Physics
关键词[WOS]: BARYON ACOUSTIC-OSCILLATIONS ; LUMINOUS RED GALAXIES ; COSMOLOGICAL CONSTANT ; SUPERNOVA ; REDSHIFT ; DISTANCE
收录类别: SCI
语种: 英语
WOS记录号: WOS:000341848800030
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内容类型: 期刊论文
URI标识: http://libir.pmo.ac.cn/handle/332002/15761
Appears in Collections:陆埮_期刊论文

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作者单位: 1.Nanjing Univ, Dept Phys, Nanjing 210093, Jiangsu, Peoples R China
2.Chinese Acad Sci, Inst High Energy Phys, Key Lab Particle Astrophys, Beijing 100049, Peoples R China
3.Chinese Acad Sci, Inst High Energy Phys, Div Theoret Phys, Beijing 100049, Peoples R China
4.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China
5.Univ Sci & Technol China, Interdisciplinary Ctr Theoret Study, Hefei 230026, Anhui, Peoples R China
6.Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Jiangsu, Peoples R China
7.Nanjing Univ, Purple Mt Observ, Joint Ctr Particle Nucl Phys & Cosmol, Nanjing 210093, Jiangsu, Peoples R China
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