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New cosmological limit on neutrino mass
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https://doi.org/10.1103/physrevd.43.3136Abstract
We show that considerations of the equilibration of right- and left-handed neutrino seas in the early Universe and the well-known He4 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 300keV. This constraint would apply to any neutrino so long as it had a purely Dirac mass and a lifetime exceeding the nucleosynthesis time scale. © 1991 The American Physical Society.
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