Assessing perturbativity and vacuum stability in high-scale leptogenesis
Abstract We consider the requirements that all coupling constants remain perturbative and the electroweak vacuum metastable up to the Planck scale in high-scale thermal leptogenesis, in the context of a type-I seesaw mechanism. We find a large region of the model parameter space that satisfies these...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
| Published: |
SpringerOpen
2018-12-01
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| Series: | Journal of High Energy Physics |
| Subjects: | |
| Online Access: | http://link.springer.com/article/10.1007/JHEP12(2018)111 |
| Summary: | Abstract We consider the requirements that all coupling constants remain perturbative and the electroweak vacuum metastable up to the Planck scale in high-scale thermal leptogenesis, in the context of a type-I seesaw mechanism. We find a large region of the model parameter space that satisfies these conditions in combination with producing the baryon asymmetry of the Universe. We demonstrate these conditions require Tr[Y N † Y N ] ≲ 0.66 on the neutrino Yukawa matrix. We also investigate this scenario in the presence of a large number N F of coloured Majorana octet fermions in order to make quantum chromodynamics asymptotically safe in the ultraviolet. |
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| ISSN: | 1029-8479 |