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Updated: Jun 5, 2026

Setting Limits on Supersymmetry Using Simplified Models
Published on: November 15, 2013
Cosmology favoring extra radiation and sub-eV mass sterile neutrinos as an option
Jan Hamann1, Steen Hannestad, Georg G Raffelt
1Department of Physics and Astronomy, University of Aarhus, Aarhus C, Denmark.
Abstract:
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 cosmic microwave background 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.
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