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.
Baryogenesis from Symmetry Principle
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In this work, a formalism based on symmetry which allows one to express asymmetries of all the particles in terms of conserved charges is developed. The manifestation of symmetry allows one to easily determine the viability of a baryogenesis scenario and also to identity the different roles played by the symmetry. This formalism is then applied to the standard model and its supersymmetric extension, which constitute two important foundations for constructing models of baryogenesis.
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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.