Constraints on radiative decay of massive neutrinos

Details Constraints on radiative decay of massive neutrinos Constraints on radiative decay of massive neutrinos

Sep 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992phrvd..46.2362w&link_type=abstract

Physical Review D (Particles, Fields, Gravitation, and Cosmology), Volume 46, Issue 6, 15 September 1992, pp.2362-2365

Physics

2

Particle-Theory And Field-Theory Models Of The Early Universe, Background Radiations

Scientific paper

Recent β-decay experiments provide evidence for the existence of neutrinos with a mass of 17 keV. If they do exist, they should decay into lighter particles in order to avoid overclosing the Universe. Radiative decay may leave an imprint on the relic radiation from the big bang, and energy injection into the cosmic microwave background radiation should have observational consequences. In particular, the limits recently obtained on the y distortion of the blackbody spectrum of the cosmic microwave background provide stringent constraints on the radiative-decay properties of these neutrinos. We have found that the photon branching ratio has to be Bγ<~10-5 for the neutrino lifetime τ~=1010-1011 s. For τ>~1011 s, Bγ is constrained by the upper limits on the extragalactic background radiation at optical and UV wavelengths; the upper limit on Bγ decreases to about 10-6 at τ~=1012 s.

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