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arXiv · 2312.17730

Axion cogenesis without isocurvature perturbations

Raymond T. Co·Masaki Yamada
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Abstract

Axion rotations can simultaneously explain the dark matter abundance and the baryon asymmetry of the Universe by kinetic misalignment and axiogenesis. We consider a scenario in which the Peccei-Quinn symmetry breaking field is as large as the Planck scale during inflation and the axion rotation is initiated by the inflaton-induced potential immediately after the end of inflation. This is a realization of the cogenesis scenario that is free of problems with domain walls and isocurvature perturbations thanks to large explicit Peccei-Quinn symmetry breaking at the Planck scale during inflation. The baryon asymmetry can be more efficiently produced by lepto-axiogenesis, in which case the axion mass is predicted to be larger than $O(0.1)$ meV. We also discuss a UV complete model in supersymmetric theories.

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Raymond T. Co, Masaki Yamada. 2023-12-29. Axion cogenesis without isocurvature perturbations. https://arxiv.org/abs/2312.17730

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