Physics
Scientific paper
Jul 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992phrvl..69..571m&link_type=abstract
Physical Review Letters (ISSN 0031-9007), vol. 69, no. 4, July 27, 1992, p. 571-574. Research supported by SNFO.
Physics
29
Big Bang Cosmology, Energy Levels, Galactic Evolution, Neutrinos, Nuclear Reactions, Dark Matter, Halos, Universe
Scientific paper
Recent experimental evidence indicates that the 17 keV neutrino must be unstable to prevent the universe from being 'overclosed' by a factor of almost 200 today. It is pointed out here that the generically simplest decay pattern of this neutrino is severely constrained by saturation of the final-state levels, leading to an equilibrium with effective lifetime approaching 10 exp 5 sec irrespective of the free particle lifetime t(free), provided that t(free) is between 3 x 10 exp -4 and 10 exp 5. If either of the decay products have eV masses, galaxy formation may proceed via a variant of the hot dark matter model or like a hybrid hot plus cold dark matter model, with the same particle responsible for both components. Phase-space constraints on the masses of dark-matter particles in galaxy halos are strengthened significantly due to the nonzero chemical potentials (except in the hybrid case).
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