Leptogenesis with dirac neutrinos
We describe a "neutrinogenesis" mechanism whereby, in the presence of right-handed neutrinos with sufficiently small pure Dirac masses, (B+L)-violating sphaleron processes create the baryon asymmetry of the Universe, even when B = L = 0 initially. It is shown that the resulting neutrino mass constraints are easily fulfilled by the neutrino masses suggested by current experiments. We present a simple toy model which uses this mechanism to produce the observed baryon asymmetry of the Universe.
Dick
K
Physik Department, Technische Universitat Munchen, D-85748 Garching, Germany and and Max Planck Institut fur Physik, D-80805 Munchen, Germany.
Lindner
M
Ratz
M
Wright
D