Cosmological abundances of right-handed Dirac neutrinos
Abstract
The equilibration of the right-helicity states + of light Dirac-neutrinos is discussed. I point out that the + production rate is enhanced by weak gauge boson pole effects so that the right-helicity component of τ is brought into equilibrium at T 10 GeV independently of the initial abundance, provided m_τ 10 keV. Neutrino spin flip in primordial magnetic fields and the resulting bound on μ is also discussed.
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