Cosmological baryon production in spontaneous-CP-violating models without strong CP problem

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Charge Conjugation, Parity, Time Reversal, And Other Discrete Symmetries, Spontaneous And Radiative Symmetry Breaking, Particle-Theory And Field-Theory Models Of The Early Universe

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We study the cosmological baryon production in two different classes of spontaneous-CP-violating models with no strong CP problem. All known realistic models predict a large ΔB in the range required by the observed baryon asymmetry. In the first class of models in which CP violation is transmitted from the grand-unification scale down to the low-energy sector through fermion mixing effects, baryon asymmetry arises from the nonunitarity of the transformation matrices. It is pointed out that there is no dangerous flavor-changing neutral current due to Z-boson exchanges in the Nelson-type models. Weak CP-odd interactions are mediated by colored scalars in the second class of models. Large matter-antimatter asymmetry can result from the decays of superheavy leptoquark scalars or from the decays of color-triplet Higgs bosons into a superheavy and light fermion.

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