A new limit on the total neutrino mass from the 2dF Galaxy Redshift Survey

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  • 9 April 2002
Abstract
We constrain f_nu = Omega_nu / Omega_m}, the fractional contribution of neutrinos to the total mass density in the Universe, by comparing the power spectrum of fluctuations derived from the 2dF Galaxy Redshift Survey with model matter power spectra. The model considered is a spatially flat universe with four components: baryons, cold dark matter, massive neutrinos (hot dark matter) and a cosmological constant. By adding constraints from other independent cosmological probes we find f_nu < 0.13 and m_nu,tot < 1.8 eV (at 95% confidence), for a prior of 0.1< Omega_m <0.5, and assuming the scalar spectral index n=1. The corresponding results for n=1.1 are f_\nu < 0.16, m_nu,tot< 2.2 eV. Very similar results are obtained using instead a prior on Omega_m from Type Ia supernovae surveys.

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