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Cosmological abundances of right-handed neutrinos

We study the equilibration of the right-helicity states of light Dirac neutrinos in the early universe by solving the momentum dependent Boltzmann equations numerically. We show that the main effect is due to electroweak gauge boson poles, which enhance thermalization rates by some three orders of magnitude. The right-helicity states of tau neutrinos will be brought in equilibrium independently of their initial distribution at a temperature above the poles if the tau neutrino mass is larger than about 10 keV.

preprint1996arXivOpen access
Kari EnqvistPetteri KeränenJukka MaalampiHannes Uibo
astro-phhep-ph
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Open access4 authors2 topics
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Kari EnqvistPetteri KeränenJukka MaalampiHannes Uibo

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