PoS - Proceedings of Science
Volume 340 - The 39th International Conference on High Energy Physics (ICHEP2018) - Parallel: Astro-particle Physics and Cosmology
Extremely weak and super-efficient production of keV sterile neutrino: phase transition and induced parametric resonance creation.
A. Chudaykin
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Published on: August 02, 2019
We introduce a novel generation mechanism of sterile neutrinos in the presence of a light coherently oscillating scalar field. This field modulates the mass of sterile neutrino in the early Universe providing non-trivial oscillation dynamics. In a region of model parameters oscillations between active and sterile neutrinos are resonantly enhanced. This mechanism allows sterile neutrinos with extremely small mixing to produce Dark Matter (DM) evading X-ray constraints. At the same time the spectrum of produced particles is cooler than in case of ordinary non-resonant production of sterile neutrinos, thus opening a window of lower masses which is otherwise forbidden by structure formation constraints.
DOI: https://doi.org/10.22323/1.340.0547
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