An axion rolling in the early universe can source the baryon asymmetry through the hypercharge anomaly, and its photon coupling creates a CMB spectral distortion that flattens to a constant at low frequencies.
Can baryon asymmetry be explained by a large initial value before inflation? Phys
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Baryogenesis and CMB spectral distortion from Axions
An axion rolling in the early universe can source the baryon asymmetry through the hypercharge anomaly, and its photon coupling creates a CMB spectral distortion that flattens to a constant at low frequencies.