The WiggleZ Dark Energy Survey: Cosmological neutrino mass constraint from blue high-redshift galaxies

Physical Review D (Impact Factor: 4.64). 12/2011; 85(8). DOI: 10.1103/PhysRevD.85.081101
Source: arXiv


The absolute neutrino mass scale is currently unknown, but can be constrained
from cosmology. The WiggleZ high redshift star-forming blue galaxy sample is
less sensitive to systematics from non-linear structure formation,
redshift-space distortions and galaxy bias than previous surveys. We obtain a
upper limit on the sum of neutrino masses of 0.60eV (95% confidence) for
WiggleZ+Wilkinson Microwave Anisotropy Probe. Combining with priors on the
Hubble Parameter and the baryon acoustic oscillation scale gives an upper limit
of 0.29eV, which is the strongest neutrino mass constraint derived from
spectroscopic galaxy redshift surveys.

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Available from: Rob Sharp
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    • "The shape of the galaxy power spectrum and correlation function are also sensitive to the underlying cosmology, and can be used to put strong constraints on cosmological parameters [15] [16]. In particular, such observables are able to provide upper bounds to the sum of neutrino masses, [17] [18] [19] [20] [21] [22] [23] [24] [25] [26]. "
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    • "A great deal of effort has been dedicated to reducing the upper limit of m ν from a number of large scale structure projects, e.g. 2dFGRS, SDSS, WiggleZ, CFHTLS galaxy surveys [14] [15] [16] [17] [18] [19] [20] [21] [22] [23] [24] [25] [26] [27] [28] [29] [30] [31] [32]. "
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    ABSTRACT: 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 ($\mnu$), the effective number of neutrino species ($\neff$) and dark energy equation of state ($w$), individually and collectively. We find that a tight upper limit on $\mnu$ can be extracted from the full data combination, if $\neff$ and $w$ are fixed. However this upper bound is severely weakened if $\neff$ and $w$ are allowed to vary. This result naturally raises questions on the robustness of previous strict upper bounds on $\mnu$, ever reported in the literature. The best-fit values from our most generalized constraint read $\mnu=0.556^{+0.231}_{-0.288}\rm eV$, $\neff=3.839\pm0.452$, and $w=-1.058\pm0.088$ 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 $\neff$. 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.
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