We use the galaxy angular power spectrum at z ∼ 0.5-1.2 from the Canada-France-Hawaii-Telescope Legacy Survey Wide fields (CFHTLS-Wide) to constrain separately the total neutrino mass ∑m ν 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 ∑m ν<0.29 eV and N eff=4.17 +1.62 -1.26 (2σ confidence levels). If we omit smaller scales which may be affected by non-linearities, these constraints become ∑m ν<0.41 eV and N eff=3.98 +2.02 -1.20 (2σ 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.

Constraints on massive neutrinos from the CFHTLS angular power spectrum / J. Xia, B.R. Granett, M. Viel, S. Bird, L. Guzzo, M.G. Haehnelt, J. Coupon, H.J. Mccracken, Y. Mellier. - In: JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS. - ISSN 1475-7516. - 2012:6(2012), pp. 010.010-010.010.

Constraints on massive neutrinos from the CFHTLS angular power spectrum

L. Guzzo;
2012

Abstract

We use the galaxy angular power spectrum at z ∼ 0.5-1.2 from the Canada-France-Hawaii-Telescope Legacy Survey Wide fields (CFHTLS-Wide) to constrain separately the total neutrino mass ∑m ν 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 ∑m ν<0.29 eV and N eff=4.17 +1.62 -1.26 (2σ confidence levels). If we omit smaller scales which may be affected by non-linearities, these constraints become ∑m ν<0.41 eV and N eff=3.98 +2.02 -1.20 (2σ 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.
cosmological neutrinos; cosmological parameters from LSS; neutrino masses from cosmology; power spectrum; Astronomy and Astrophysics
Settore FIS/05 - Astronomia e Astrofisica
http://iopscience.iop.org/1475-7516/2012/06/010/pdf/1475-7516_2012_06_010.pdf
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/2434/484538
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