Right-handed Neutrinos as Superheavy Dark Matter

Details Right-handed Neutrinos as Superheavy Dark Matter Right-handed Neutrinos as Superheavy Dark Matter

2001-07-30

arxiv.org/abs/hep-ph/0107297v3

JHEP 0112 (2001) 034

Physics

High Energy Physics

High Energy Physics - Phenomenology

11 pages, 5 figures, to appear in JHEP

Scientific paper

10.1088/1126-6708/2001/12/034

We propose that right-handed neutrinos are very long-lived dark matter. The long lifetime is realized by the separation of the wavefunction of right-handed neutrinos and that of other fermions in an extra dimension. Such long-lived and superheavy dark matter can naturally explain observed ultra high energy cosmic rays above the GZK cutoff (5 * 10^{19} eV) and huge amounts of cold dark matter simultaneously. Furthermore, the exponentially suppressed Yukawa couplings of right-handed neutrinos leads to the high predictablilty on the mass parameter of the neutrinoless double beta decay, as all the models which predict very small neutrino mass of one generation.

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