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We calculate the free-streaming length and the phase space density ofdark-matter sterile neutrinos produced from decays, at the electroweak scale,of a gauge singlet in the Higgs sector. These quantities, which depend on thedark-matter production mechanism, are relevant to the study of small-scalestructure formation and may be used to constrain or rule out dark-mattercandidates.

Small-scale structure formation properties of chilled sterile neutrinos as dark matter