Neutrino masses, cosmological inflation and dark matter in a variant U(1)B-L model with type II seesaw mechanism * *Supported by Conselho Nacional de Pesquisa e Desenvolvimento Científico - CNPq (C.A.S.P) and Coordenação de Aperfeicoamento de Pessoal de Nível Superior - CAPES (A.C.O.S and J.G.R)

Abstract

In this study, we implemented the type II seesaw mechanism into the framework of the gauge model. To achieve this, we added a scalar triplet, , to the canonical particle content of the gauge model. By imposing that the gauge symmetry be spontaneously broken at TeV scale, we show that the type II seesaw mechanism is realized at an intermediate energy scale, more precisely, at approximately GeV. To prevent heavy right-handed neutrinos from disturbing the mechanism, we evoke a discrete symmetry. Interestingly, as a result, we have standard neutrinos with mass around eV scale and right-handed neutrinos with mass in TeV scale, with the lightest one fulfilling the condition of dark matter. We developed all of these in this study. In addition, we show that the neutral component of may perform unproblematic non-minimal inflation with loss of unitarity.