Cosmology seeking friendship with sterile neutrinos

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 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.

4 pages, 1 figure, matches version published in PRL

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• Neutrino physics from precision cosmology
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• Robust Cosmological Bounds on Neutrinos and their Combination with Oscillation Results
• Dark Radiation Emerging After Big Bang Nucleosynthesis?
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• Constraining warm dark matter with cosmic shear power spectra
• Axions and saxions from the primordial supersymmetric plasma and extra radiation signatures
• Observational constraints on cosmic neutrinos and dark energy revisited
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