On the lifetime of a cold dark matter particle and the cosmological diffuse photon background

Details On the lifetime of a cold dark matter particle and the cosmological diffuse photon background On the lifetime of a cold dark matter particle and the cosmological diffuse photon background

1999-10-27

arxiv.org/abs/hep-ph/9910512v2

Nuovo Cim. B115 (2000) 445-458

Physics

High Energy Physics

High Energy Physics - Phenomenology

18 pages, LaTeX style, numerics revisited, one reference added

Scientific paper

We show that a Majorana heavy neutrino with a mass O(100TeV) is a good candidate particle for cold dark matter. It can be responsible for the majority of the cosmological diffuse photon background owing to lifetime of the order of O(10^(25)s), dominantly fixed by the radiative two-body decay. The lifetime is suppressed by two mechanisms: the leptonic GIM cancellation and the see-saw weak coupling suppression. As a fermion cold dark matter particle, a heavy neutrino favours the average mass density of the Universe constrained by the Einstein-Cartan cosmology.

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