Cold Dark Matter from heavy Right-Handed neutrino mixing

Details Cold Dark Matter from heavy Right-Handed neutrino mixing Cold Dark Matter from heavy Right-Handed neutrino mixing

2008-12-30

arxiv.org/abs/0812.5085v2

Phys.Rev.D80:073017,2009

Physics

High Energy Physics

High Energy Physics - Phenomenology

5 pages; v2: Ref.'s added, typos corrected, 2 footnotes added; published in PRD

Scientific paper

10.1103/PhysRevD.80.073017

We show that, within the see-saw mechanism, an almost decoupled RH neutrino species N_DM with mass M_DM \gtrsim 100 GeV can play the role of Dark Matter (DM). The N_DM's can be produced from non-adiabatic conversions of thermalized (source) RH neutrinos with mass M_S lower than M_DM. This is possible if a non-renormalizable operator is added to the minimal type I see-saw lagrangian. The observed DM abundance can be reproduced for M_DM \delta^{1/4} \sim 10^-13 \Lambda_eff \xi, where \Lambda_eff is a very high energy new physics scale, \delta \equiv (M_DM-M_S)/M_DM and \xi \lesssim 1 is a parameter determined by the RH neutrino couplings.

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