期刊
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
卷 -, 期 6, 页码 -出版社
IOP Publishing Ltd
DOI: 10.1088/1475-7516/2012/06/010
关键词
power spectrum; cosmological parameters from LSS; cosmological neutrinos; neutrino masses from cosmology
资金
- NASA Office of Space Science
- ASI/AAE
- INFN/PD-51
- PRIN MIUR
- PRIN INAF
- European Research Council
- NSF [AST-0907969]
- Institute for Advanced Study
- Alfred P. Sloan Foundation
- Participating Institutions
- National Science Foundation
- U.S. Department of Energy
- National Aeronautics and Space Administration
- Japanese Monbukagakusho
- Max Planck Society
- Higher Education Funding Council for England
- Science and Technology Facilities Council [ST/J001538/1, ST/H004912/1, ST/H00243X/1] Funding Source: researchfish
- STFC [ST/J001538/1, ST/H004912/1] Funding Source: UKRI
We use the galaxy angular power spectrum at z similar to 0.5-1.2 from the Canada-France-Hawaii-Telescope Legacy Survey Wide fields (CFHTLS-Wide) to constrain separately the total neutrino mass Sigma m(v) and the effective number of neutrino species N-eff. This survey has recently benefited from an accurate calibration of the redshift distribution, allowing new measurements of the (non-linear) matter power spectrum in a unique range of scales and redshifts sensitive to neutrino free streaming. Our analysis makes use of a recent model for the effect of neutrinos on the weakly non-linear matter power spectrum derived from accurate N-body simulations. We show that CFHTLS, combined with WMAP7 and a prior on the Hubble constant provides an upper limit of Sigma m(v) < 0.29 eV and N-eff = 4.17(-1.26)(+1.62) (2 sigma confidence levels). If we omit smaller scales which may be affected by non-linearities, these constraints become Sigma m(v) < 0.41 eV and N-eff = 3.98(-1.20)(+2.02) (2 sigma confidence levels). Finally we show that the addition of other large scale structures probes can further improve these constraints, demonstrating that high redshift large volumes surveys such as CFHTLS are complementary to other cosmological probes of the neutrino mass.
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