Baryon-antibaryon asymmetry in a model with domain structure and soft CP violation

The authors consider a model with an Abelian gauge symmetry, a Higgs potential involving two scalar fields, and two spinor fields coupled to the scalars through Yukawa couplings. The model accommodates soft violation of charge conjugation, and a domain structure of the universe with two different types of domains, which have identical energy but are governed by different effective Lagrangians. The effective Lagrangian has complex c-number coefficients that become parts of effective coupling constants, and these are different in the two kinds of domains. Nevertheless particle-antiparticle and domain asymmetries need not arise in this model. These asymmetries can be controlled, even to the point of vanishing, by tuning the relative strengths of the Yukawa couplings of the two scalar fields to the hermitized product of the two spinor fields