Light Singlet Neutrinos and the Primordial Nucleosynthesis

Kainulainen, Kimmo

doi:10.1016/0370-2693(90)90054-A

Light Singlet Neutrinos and the Primordial Nucleosynthesis

Kimmo Kainulainen
(
- Helsinki U.
)

Apr, 1990

5 pages

Published in:

Phys.Lett.B 244 (1990) 191-195

Published: 1990

DOI:

10.1016/0370-2693(90)90054-A

Report number:

HU-TFT-90-23

View in:

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Abstract: (Elsevier)

We study the production of light SU (2)-singlet neutrinos in the early universe. It is shown that a singlet neutrino v x may be brought into thermal equilibrium if it mixes with an ordinary doublet neutrino. The nucleosynthesis limit on the number of the light neutrinos then places more stringent limits on the oscillation parameters than what has been obtained in the earthbound experiments. The v e −v x oscillation still remains a viable solution for the solar neutrino problem.

neutrino: singlet
neutrino: mass
mass: neutrino
symmetry: SU(2)
astrophysics
neutrino: production
production: neutrino
neutrino: oscillation
neutrino: mixing angle
neutrino: flavor

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