Light pseudo-Goldstone Higgs boson from $SO(10)$ GUT with realistic phenomenology

Within the supersymmetric $SO(10)$ grand unified theory (GUT), a new mechanism giving the light Higgs doublet as a pseudo-Goldstone mode is suggested. Realizing this mechanism, we present an explicit model with fully realistic phenomenology. In particular, desirable symmetry breaking and natural all-order hierarchy are achieved. The constructed model allows one to have a realistic fermion pattern, nucleon stability, and successful gauge coupling unification. The suggested mechanism opens prospects in the field for a novel $SO(10)$ GUT model building and for further investigations.

Figure 1

Gauge coupling unification within the presented $SO(10)$ model. The spectrum of states is given in Eq. (24).