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 YN] ≲ 0.66 on the neutrino Yukawa matrix. We also investigate this scenario in the presence of a large number NF of coloured Majorana octet fermions in order to make quantum chromodynamics asymptotically safe in the ultraviolet.
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Ipek, S., Plascencia, A.D. & Turner, J. Assessing perturbativity and vacuum stability in high-scale leptogenesis. J. High Energ. Phys. 2018, 111 (2018). https://doi.org/10.1007/JHEP12(2018)111
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DOI: https://doi.org/10.1007/JHEP12(2018)111