2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/205244We calculate the free-streaming length and the phase space density of dark-matter sterile neutrinos produced from decays, at the electroweak scale, of a gauge singlet in the Higgs sector. These quantities, which depend on the dark-matter production mechanism, are relevant to the study of small-scale structure formation and may be used to constrain or rule out dark-matter candidates.6 pages, 3 figuresHigh Energy Physics - Phenomenologytext