Electroweak Absolute, Meta-, and Thermal Stability in Neutrino Mass Models
Manfred Lindner, Hiren H. Patel, Branimir Radov\v{c}i\'c
TL;DR
This paper investigates the stability of the electroweak vacuum in neutrino mass models with right-handed neutrinos or fermionic triplets, considering absolute, metastable, and thermal stability constraints.
Contribution
It provides new limits on neutrino Yukawa couplings by analyzing stability conditions, accounting for uncertainties in the top quark mass.
Findings
Upper limits on neutrino Yukawa couplings vary with top quark mass.
Metastability and thermal stability constraints are crucial for model viability.
Results impact the parameter space of neutrino mass models.
Abstract
We analyze the stability of the electroweak vacuum in neutrino mass models containing right handed neutrinos or fermionic isotriplets. In addition to considering absolute stability, we place limits on the Yukawa couplings of new fermions based on metastability and thermal stability in the early Universe. Our results reveal that the upper limits on the neutrino Yukawa couplings can change significantly when the top quark mass is allowed to vary within the experimental range of uncertainty in its determination.
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