Cosmological abundances of right-handed neutrinos

Details Cosmological abundances of right-handed neutrinos Cosmological abundances of right-handed neutrinos

1996-08-17

arxiv.org/abs/hep-ph/9608354v1

Nucl.Phys.B484:403-418,1997

Physics

High Energy Physics

High Energy Physics - Phenomenology

LaTeX, 18 pages, 5 PostScript figures

Scientific paper

10.1016/S0550-3213(96)00604-9

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.

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