ELECTROWEAK BARYOGENESIS AND THE PHASE-TRANSITION DYNAMICS

The baryogenesis is reanalyzed based on the model by Cohen et al., in which the lepton number, generated by the neutrinos scattering from th e bubble walls appearing in the development of the electroweak phase t ransition, is converted to the baryon number excess through the sphale ron transition. A formula obtained in this paper on the lepton number production rate is correct for both the thin and thick walls within th e linear approximation. Investigation on the time development of the f irst order phase transition is simulated, including the temporal chang e of the wall velocity as well as the fusion effect of the bubbles. Th e details of such phase transition dynamics are found to affect consid erably the final value of the baryon number excess.