Flavor unification, dark matter, proton decay and other observable predictions with low-scale symmetry
arXiv:1011.4577 · doi:10.1103/PhysRevD.83.093004
Abstract
We show how gauge coupling unification is successfully implemented through non-supersymmetric grand unified theory, , using low-scale flavor symmetric model of the type recently proposed by Hagedorn, Lindner, and Mohapatra, while assigning matter-parity discrete symmetry for the dark matter stability. For gauge coupling unification in the single-step breaking case, we show that a color-octet fermion and a hyperchargeless weak-triplet fermionic dark matter are the missing particles needed to complete its MSSM-equivalent degrees of freedom. When these are included the model automatically predicts the nonsupersymmetric grand unification with a scale identical to the minimal supersymmetric standard model/grand unified theory scale. We also find a two-step breaking model with Pati-Salam intermediate symmetry where the dark matter and a low-mass color-octet scalar or the fermion are signaled by grand unification. The proton-lifetime predictions are found to be accessible to ongoing or planned searches in a number of models. We discuss grand unified origin of the light fermionic triplet dark matter, the color-octet fermion, and their phenomenology.
26 pages LaTeX, 3 figures, typos added, references removed
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