Freeze-in dark matter within the seesaw mechanism

Freeze-in dark matter within the seesaw mechanism

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We show that the minimal Type-I Seesaw mechanism can successfully account for the observed dark matter abundance in the form of a keV sterile neutrino.This population can be produced by the decay of the heavier neutral leptons, with masses above the Eye Cream electroweak mass scale, while they Desktop Vaporizers are in thermal equilibrium in the early Universe (freeze-in).Moreover, the implementation of the relevant phenomenological constraints (relic abundance, indirect detection and structure formation) on this model automatically selects a region of the parameter space featuring an approximate lepton number symmetry.