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arXiv · 1806.00460

Assessing Perturbativity and Vacuum Stability in High-Scale Leptogenesis

Seyda Ipek·Alexis D. Plascencia·Jessica Turner
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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 ${\rm Tr}[Y_N^\dagger Y_N] \lesssim 0.66$ 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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Seyda Ipek, Alexis D. Plascencia, Jessica Turner. 2018-06-01. Assessing Perturbativity and Vacuum Stability in High-Scale Leptogenesis. https://doi.org/10.1007/jhep12(2018)111

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