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Phys Rev Lett. 2014 Jan 24;112(3):031802. Epub 2014 Jan 22.

How self-interactions can reconcile sterile neutrinos with cosmology.

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Department of Physics and Astronomy, University of Aarhus, 8000 Aarhus C, Denmark.
Institut de Théorie des Phénomènes Physiques, École Polytechnique Fédérale de Lausanne, CH-1015 Lausanne, Switzerland.


Short baseline neutrino oscillation experiments have shown hints of the existence of additional sterile neutrinos in the eV mass range. However, such neutrinos seem incompatible with cosmology because they have too large of an impact on cosmic structure formation. Here we show that new interactions in the sterile neutrino sector can prevent their production in the early Universe and reconcile short baseline oscillation experiments with cosmology.

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