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Cold Dark Matter from heavy Right-Handed neutrino mixing · Around

2008

Cold Dark Matter from heavy Right-Handed neutrino mixing

Anisimov, Alexey, Di Bari, Pasquale

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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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2005

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