Abstract
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.
Highlights
Despite enormous success, the Standard Model (SM), failing to explain several observations, needs to be extended
SUSY ensures the stability of the weak scale
There are numerous merits of the SUSY SOð10Þ grand unification theory (GUT), the most challenging problem—the doublet-triplet (DT) splitting problem— needs to be taken seriously [6]
Summary
The Standard Model (SM), failing to explain several observations, needs to be extended. The SM’s minimal SUSY extension (MSSM) leads to successful gauge coupling unification [5] (a necessary ingredient for GUTs) and includes the viable dark matter candidate— the neutralino. The first time within the SUSY SOð10Þ GUT, I propose the possibility for the Higgs doublet supermultiplets emerging as light PGBs. The model I present turns out to be fully realistic. The model I construct offers a realistic fermion pattern, nucleon stability, and successful gauge coupling unification. Because of these issues (usually turning out to be severe problems for various GUTs), I find the presented SOð10Þ model to be quite successful. The mechanism proposed in this paper opens the door for future work to build varieties of PGB SOð10Þ models and investigate their phenomenological implications
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