Possible cosmological scenario with an unstable 17-keV neutrino

Details Possible cosmological scenario with an unstable 17-keV neutrino Possible cosmological scenario with an unstable 17-keV neutrino

Sep 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985natur.317..335p&link_type=abstract

Nature (ISSN 0028-0836), vol. 317, Sept. 26, 1985, p. 335, 336.

Mathematics

Logic

5

Cosmology, Neutrinos, Radiative Lifetime, Particle Mass, Red Shift, Universe

Scientific paper

Simpson has recently reported evidence for a heavy neutrino of ≡17.1 keV mass. Cosmological bounds on stable neutrino species imply that this neutrino (νH) must be unstable. The most likely decay mode, νH→νL+f where νL is a light neutrino and f is a scalar boson, leads to a cosmological scenario, where the Universe becomes matter dominated at a redshift of z ≡ 107 and becomes radiation-dominated (by the decay product νL of νH) at z ≡ 310. The growth of baryonic perturbations is severely limited in this model because virtually no growth can take place in the radiation-dominated region z < 310 and decay of νH is likely to disrupt and smooth-out past growth by a large factor.

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