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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.

Extremely weak and super-efficient production of keV sterile neutrino: phase transition and induced parametric resonance creation.