We discuss the hypothesis that cosmological baryon asymmetry and entropy were produced in the early Universe by a phase transition of the scalar fields in the framework of the spontaneous baryogenesis scenario. We show that the annihilation of the matter-antimatter clouds during the cosmological hydrogen recombination could distort the CMB anisotropies and polarization by delaying the recombination. After recombination the annihilation of the antibaryonic clouds (ABCs) and baryonic matter can produce peaklike reionization at the high redshifts before quasar and early galaxy formation. We discuss the constraints on the parameters of the spontaneous baryogenesis scenario by the recent WMAP CMB anisotropy and polarization data and on possible manifestation of the antimatter clouds in the upcoming Planck data.

• Received 5 December 2003

DOI:https://doi.org/10.1103/PhysRevD.69.123518