Is our vacuum global in a 331 model with three triplets?

Kristjan Kannike, Niko Koivunen, Aleksei Kubarski

We consider a 331 model, based on ${\hat{I}}^2=-1/\sqrt{3}$, with three $SU(3)$ triplets with a softly broken ${\mathbb{Z}}_2$ symmetry. The resulting scalar potential is commonly used in phe…