Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2010-06-28
Phys.Rev.Lett.105:181301,2010
Physics
High Energy Physics
High Energy Physics - Phenomenology
4 pages, 1 figure, matches version published in PRL
Scientific paper
10.1103/PhysRevLett.105.181301
Precision cosmology and big-bang nucleosynthesis mildly favor extra radiation in the universe beyond photons and ordinary neutrinos, lending support to the existence of low-mass sterile neutrinos. We use the WMAP 7-year data, small-scale CMB observations from ACBAR, BICEP and QuAD, the SDSS 7th data release, and measurement of the Hubble parameter from HST observations to derive credible regions for the assumed common mass scale m_s and effective number N_s of thermally excited sterile neutrino states. Our results are compatible with the existence of one or perhaps two sterile neutrinos, as suggested by LSND and MiniBooNE, if m_s is in the sub-eV range.
Hamann Jan
Hannestad Steen
Tamborra Irene
Wong Yvonne Y. Y.
~Raffelt Georg G.
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