New cosmological limit on neutrino mass

Details New cosmological limit on neutrino mass New cosmological limit on neutrino mass

May 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991phrvd..43.3136f&link_type=abstract

Physical Review D (Particles and Fields), Volume 43, Issue 10, 15 May 1991, pp.3136-3139

Physics

24

Elementary Particle Processes, Particle-Theory And Field-Theory Models Of The Early Universe

Scientific paper

We show that considerations of the equilibration of right- and left-handed neutrino seas in the early Universe and the well-known 4He constraint on the number of relativistic degrees of freedom extant at the nucleosynthesis epoch lead to a new limit on the Dirac neutrino mass of mν<<300 keV. This constraint would apply to any neutrino so long as it had a purely Dirac mass and a lifetime exceeding the nucleosynthesis time scale.

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