Standard-misalignment axions coupled to strong or weak sphalerons can produce the observed baryon asymmetry at GUT-scale decay constants, whereas the vanilla Majoron scenario is ruled out by late-time dilution.
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Axion-driven spontaneous leptogenesis, precisely
Standard-misalignment axions coupled to strong or weak sphalerons can produce the observed baryon asymmetry at GUT-scale decay constants, whereas the vanilla Majoron scenario is ruled out by late-time dilution.