Distortions of the cosmic radiation spectrum in baryon-symmetric cosmologies

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Abstract
In matter–antimatter symmetric cosmologies, annihilation-induced heating distorts the spectrum of the microwave background radiation. For ‘violent’ models, such as that of Stecker & Puget, the predicted distortions exceed the observational constraints. For ‘quiescent’ models, such as that of Aldrovandi et al., only small distortions are produced, and these are consistent with current observational limits. It is, however, difficult to understand the origin of galaxies in the quiescent models. The retarded recombination in such models vastly increases the photon drag on any annihilation driven turbulence.

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