Observational constraints on cosmic neutrinos and dark energy revisited
文献类型：期刊论文
| 作者 | Wang, Xin1,2; Meng, Xiao-Lei1,3; Zhang, Tong-Jie1,4; Shan, HuanYuan5,6,7,8; Gong, Yan9 ; Tao, Charling5,6,7,8; Chen, Xuelei3; Huang, Y. F.2
|
| 刊名 | JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
 |
| 出版日期 | 2012-11-01 |
| 期号 | 11 |
| 关键词 | neutrino properties neutrino masses from cosmology power spectrum weak gravitational lensing |
| 英文摘要 | Using several cosmological observations, i.e. the cosmic microwave background anisotropies (WMAP), the weak gravitational lensing (CFHTLS), the measurements of baryon acoustic oscillations (SDSS+WiggleZ), the most recent observational Hubble parameter data, the Union2.1 compilation of type Ia supernovae, and the HST prior, we impose constraints on the sum of neutrino masses (Sigma m(v)), the effective number of neutrino species (N-eff) and dark energy equation of state (w), individually and collectively. We find that a tight upper limit on Sigma m(v) can be extracted from the full data combination, if N-eff and w are fixed. However this upper bound is severely weakened if N-eff and w are allowed to vary. This result naturally raises questions on the robustness of previous strict upper bounds on Sigma m(v), ever reported in the literature. The best-fit values from our most generalized constraint read Sigma m(v) = 0.556(-0.288)(+0.231) eV, N-eff = 3.839 +/- 0.452, and w = -1.058 +/- 0.088 at 68% confidence level, which shows a firm lower limit on total neutrino mass, favors an extra light degree of freedom, and supports the cosmological constant model. The current weak lensing data are already helpful in constraining cosmological model parameters for fixed w. The dataset of Hubble parameter gains numerous advantages over supernovae when w = -1, particularly its illuminating power in constraining N-eff. As long as w is included as a free parameter, it is still the standardizable candles of type Ia supernovae that play the most dominant role in the parameter constraints. |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000310833100018 |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/6084]  |
| 专题 | 国家天文台_星系宇宙学研究部 |
| 作者单位 | 1.Beijing Normal Univ, Dept Astron, Beijing 100875, Peoples R China 2.Nanjing Univ, Sch Astron & Space Sci, Nanjing 210093, Jiangsu, Peoples R China 3.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China 4.Chinese Acad Sci, Kavli Inst Theoret Phys China, Beijing 100190, Peoples R China 5.Tsinghua Univ, Dept Phys, Beijing 100084, Peoples R China 6.Tsinghua Univ, Tsinghua Ctr Astrophys, Beijing 100084, Peoples R China 7.CNRS, IN2P3 Luminy, Ctr Phys Particules Marseille, F-13288 Marseille 9, France 8.Univ Aix Marseille 2, F-13288 Marseille 9, France 9.Univ Calif Irvine, Dept Phys & Astron, Irvine, CA 92697 USA |
| 推荐引用方式 GB/T 7714 | Wang, Xin,Meng, Xiao-Lei,Zhang, Tong-Jie,et al. Observational constraints on cosmic neutrinos and dark energy revisited[J]. JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS,2012(11). |
| APA | Wang, Xin.,Meng, Xiao-Lei.,Zhang, Tong-Jie.,Shan, HuanYuan.,Gong, Yan.,...&Huang, Y. F..(2012).Observational constraints on cosmic neutrinos and dark energy revisited.JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS(11). |
| MLA | Wang, Xin,et al."Observational constraints on cosmic neutrinos and dark energy revisited".JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS .11(2012). |
入库方式： OAI收割
来源：国家天文台
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。