Bonn 2010 – scientific programme

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T: Fachverband Teilchenphysik

T 22: Neutrinophysik (Theorie) II

T 22.2: Talk

Tuesday, March 16, 2010, 17:00–17:15, HG XV

keV sterile neutrino Dark Matter in gauge extensions of the Standard Model — •Hans Hettmansperger, Fedor Bezrukov, and Manfred Lindner — Max- Planck- Institut für Kernphysik, Postfach 103980, D-69029 Heidelberg, Germany

It is known, that a keV scale sterile neutrino is a good Warm Dark Matter (WDM) candidate. We realise this WDM possibility in the context of gauge extensions of the Standard Model (SM). The naive expectation leads to large thermal overproduction of sterile neutrinos in this setup. We find, that it is possible to use out-of-equilibrium decay of the other right-handed neutrinos of the model to dilute the present density of the keV sterile neutrinos and achieve the observed DM density. We present the universal requirements that should be satisfied by the gauge extensions of the SM, containing right handed neutrinos, to be viable models of WDM, and provide a simple example in the context of the Left-Right symmetric model.