In the BNT neutrino mass model the electroweak vacuum is not generically the global minimum, with stability reducible to two mass inequalities when the quadruplet vev vanishes.
Vacuum structure of theZ2 symmetric Georgi-Machacek model
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Vacuum structure of the Babu-Nandi-Tavartkiladze model of neutrino mass generation
In the BNT neutrino mass model the electroweak vacuum is not generically the global minimum, with stability reducible to two mass inequalities when the quadruplet vev vanishes.