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arXiv · 1702.04526

Sterile neutrino dark matter from right-handed neutrino oscillations

Kenji Kadota·Kunio Kaneta
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Abstract

We study a scenario where sterile neutrino (either warm or cold) dark matter (DM) is produced through (nonresonant) oscillations among right-handed neutrinos (RHNs) and can constitute the whole DM in the Universe, in contrast to the conventional sterile neutrino production through its mixing with the left-handed neutrinos. The lightest RHN can be sterile neutrino DM whose mixing with left-handed neutrinos is sufficiently small while heavier RHNs can have non-negligible mixings with left-handed neutrinos to explain the neutrino masses by the seesaw mechanism. We also demonstrate that, in our scenario, the production of sterile RHN DM from the decay of a heavier RHN is subdominant compared with the RHN oscillation production due to the X-ray and small-scale structure constraints.

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Kenji Kadota, Kunio Kaneta. 2017-02-15. Sterile neutrino dark matter from right-handed neutrino oscillations. https://doi.org/10.1103/physrevd.97.115021

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