Cosmological constraints on unstable heavy neutrinos

Details Cosmological constraints on unstable heavy neutrinos Cosmological constraints on unstable heavy neutrinos

Jan 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984phlb..134..174b&link_type=abstract

Physics Letters B, Volume 134, Issue 3-4, p. 174-178.

Physics

4

Scientific paper

We reconsider the evolution of the population of unstable heavy neutrinos in the early universe and we study numerically the kinetic equation describing this evolution in a wide range of masses and lifetimes. It appears that the scattering upon light matter whose contribution is usually overlooked, plays an important role. Such neutrinos can be frozen at a sizeable density and we use astrophysical information such as the present energy density of the universe and the measured solar neutrino flux to obtain upper limits on the lifetime of these particles.

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