Phys. Rev. D 43, 3136–3139 (1991)New cosmological limit on neutrino massReceived 19 March 1991; published in the issue dated 15 May 1991 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. © 1991 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevD.43.3136
DOI:
10.1103/PhysRevD.43.3136
PACS:
95.30.Cq, 14.60.Gh, 98.80.Cq
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