Leptogenesis with perturbations in type-II and type-III seesaw models
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arXiv
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| Format: | Preprint |
| Publié: |
2025
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| _version_ | 1866915304625405952 |
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| author | Baldes, Iason |
| author_facet | Baldes, Iason |
| contents | Density perturbations have recently been shown to lead to a novel effect in the freeze-out of heavy particles called "acoustically driven freeze-out." This leads to an enhancement in the yield in standard leptogenesis. We extend this calculation to include $2 \to 2$ washout processes in type-I leptogenesis and the Sommerfeld-enhanced $2 \to 2$ gauge annihilations in type-II and type-III leptogenesis. These CP conserving gauge annihilations suppress the yield of heavy particles sourcing the asymmetry. We show the acoustically driven freeze-out leads to novel enhancements in the baryon asymmetry in type-II and type-III leptogenesis, already in the weak washout regime, in contrast with type-I leptogenesis. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2503_02936 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Leptogenesis with perturbations in type-II and type-III seesaw models Baldes, Iason High Energy Physics - Phenomenology Cosmology and Nongalactic Astrophysics Density perturbations have recently been shown to lead to a novel effect in the freeze-out of heavy particles called "acoustically driven freeze-out." This leads to an enhancement in the yield in standard leptogenesis. We extend this calculation to include $2 \to 2$ washout processes in type-I leptogenesis and the Sommerfeld-enhanced $2 \to 2$ gauge annihilations in type-II and type-III leptogenesis. These CP conserving gauge annihilations suppress the yield of heavy particles sourcing the asymmetry. We show the acoustically driven freeze-out leads to novel enhancements in the baryon asymmetry in type-II and type-III leptogenesis, already in the weak washout regime, in contrast with type-I leptogenesis. |
| title | Leptogenesis with perturbations in type-II and type-III seesaw models |
| topic | High Energy Physics - Phenomenology Cosmology and Nongalactic Astrophysics |
| url | https://arxiv.org/abs/2503.02936 |