ITP OpenIR  > SCI期刊论文
Wang, X; Meng, XL; Zhang, TJ; Shan, HY; Gong, Y; Tao, C; Chen, XL; Huang, YF; Wang, X (reprint author), Beijing Normal Univ, Dept Astron, Beijing 100875, Peoples R China.
Observational constraints on cosmic neutrinos and dark energy revisited
Source PublicationJOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
Language英语
KeywordMatter 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
AbstractUsing 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.
2012
ISSN1475-7516
Issue11
Subject AreaPhysics
Indexed BySCI
Funding OrganizationNASA 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] ; 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] ; 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] ; 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]
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Cited Times:3[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.itp.ac.cn/handle/311006/15002
CollectionSCI期刊论文
Corresponding AuthorWang, X (reprint author), Beijing Normal Univ, Dept Astron, Beijing 100875, Peoples R China.
Recommended Citation
GB/T 7714
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).
APA Wang, X.,Meng, XL.,Zhang, TJ.,Shan, HY.,Gong, Y.,...&Wang, X .(2012).Observational constraints on cosmic neutrinos and dark energy revisited.JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS(11).
MLA Wang, X,et al."Observational constraints on cosmic neutrinos and dark energy revisited".JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS .11(2012).
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