Sterile Neutrinos as the Warm Dark Matter in the Type II Seesaw Model

Details Sterile Neutrinos as the Warm Dark Matter in the Type II Seesaw Model Sterile Neutrinos as the Warm Dark Matter in the Type II Seesaw Model

2007-09-11

arxiv.org/abs/0709.1632v1

Phys.Rev.D77:033005,2008

Physics

High Energy Physics

High Energy Physics - Phenomenology

8 pages

Scientific paper

10.1103/PhysRevD.77.033005

In the framework of type II seesaw mechanism we discuss the number of sterile right-handed Majorana neutrinos being the warm dark matter (WDM). When the type II seesaw mass term $M_\nu ^{II}$ is far less than the type I seesaw mass term $M_\nu ^{I}$, only one of three sterile neutrinos may be the WDM particle. On the contrary, the WDM particles may contain all sterile neutrinos. If $M_\nu ^{II} \sim M_\nu ^{I}$, the allowed number is not more than $N - 1$ for $N$ sterile neutrinos. It is worthwhile to stress that three different types of neutrino mass spectrum are permitted when $M_\nu ^{II} \gg M_\nu ^{I}$ and $M_\nu ^{II} \sim M_\nu ^{I}$.

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