Electroweak Interaction and Baryogenesis

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Electroweak baryogenesis depends on the profile of the bubble wall created in the first-order phase transition. It was pointed out that CP violation on the bubble wall(transitional CP violation) could become large enough to explain the baryon asymmetry of the universe(BAU). The profile of the bubble wall with CP violation is controlled by the effective potential of the two Higgs doublets in the minimal supersymmetric model(MSSM). We pointed out that the transitional CP violation really occurs by solving the equations of motion for the Higgs fieldswith the one loop effective potential at the transition temperature Tc.This type of CF violation exists only in the intermediate region between symmetric and broken phases separated by the bubble wall and never contradicts the experimental bounds on CP violation.We also showed that a tiny explicit CP violation1 which is consistent with the present bound on the neutron EDM, does nonperturbatively resolve the degeneracy between the CF-conjugate pair of bubbles to leave a sufficient BAU after the phase transition.We must stress that CF symmetry is fundamentally good and the transitional CP violation to contribute BAU is enhanced by a tiny explicit CP violation.