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题名: Observational constraints on cosmic neutrinos and dark energy revisited
作者: Wang, X ;  Meng, XL ;  Zhang, TJ ;  Shan, HY ;  Gong, Y ;  Tao, C ;  Chen, XL ;  Huang, YF
刊名: JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
出版日期: 2012
期号: 11
关键词: MATTER POWER SPECTRUM ;  HUBBLE-SPACE-TELESCOPE ;  WEAK-LENSING SURVEYS ;  OBSERVATIONS COSMOLOGICAL INTERPRETATION ;  BARYON ACOUSTIC-OSCILLATIONS ;  PROBE WMAP OBSERVATIONS ;  LUMINOUS RED GALAXIES ;  LARGE-SCALE STRUCTURE ;  EQUATION-OF-STATE ;  MASSIVE NEUTRINOS
学科分类: Physics
通讯作者: Wang, X (reprint author), Beijing Normal Univ, Dept Astron, Beijing 100875, Peoples R China.
部门归属: [Wang, Xin; Meng, Xiao-Lei; Zhang, Tong-Jie] Beijing Normal Univ, Dept Astron, Beijing 100875, Peoples R China; [Wang, Xin; Huang, Y. F.] Nanjing Univ, Sch Astron & Space Sci, Nanjing 210093, Jiangsu, Peoples R China; [Meng, Xiao-Lei; Chen, Xuelei] Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China; [Zhang, Tong-Jie] Chinese Acad Sci, Kavli Inst Theoret Phys China, Beijing 100190, Peoples R China; [Shan, HuanYuan; Tao, Charling] Tsinghua Univ, Dept Phys, Beijing 100084, Peoples R China; [Shan, HuanYuan; Tao, Charling] Tsinghua Univ, Tsinghua Ctr Astrophys, Beijing 100084, Peoples R China; [Shan, HuanYuan; Tao, Charling] CNRS, IN2P3 Luminy, Ctr Phys Particules Marseille, F-13288 Marseille 9, France; [Shan, HuanYuan; Tao, Charling] Univ Aix Marseille 2, F-13288 Marseille 9, France; [Gong, Yan] Univ Calif Irvine, Dept Phys & Astron, Irvine, CA 92697 USA
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.
资助者: NASA Office of Space Science; National Science Foundation of China [11173006]; Ministry of Science and Technology National Basic Science program (project 973) [2012CB821804]; Fundamental Research Funds for the Central Universities; Natural Science Foundation of China [11033002]; National Basic Research Program of China (973 Program) [2009CB824800]
收录类别: SCI
原文出处: 查看原文
语种: 英语
WOS记录号: WOS:000310833100018
Citation statistics: 
内容类型: 期刊论文
URI标识: http://ir.itp.ac.cn/handle/311006/15002
Appears in Collections:理论物理所2012年知识产出_期刊论文

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Recommended Citation:
Wang, X,Meng, XL,Zhang, TJ,et al. Observational constraints on cosmic neutrinos and dark energy revisited[J]. JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS,2012(11).
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