Product Groups, Discrete Symmetries, and Grand Unification
Yael Shadmi
Abstract
We present GUT models based on an SU(5)× SU(5) GUT group. These models maintain the main successes of simple-group GUTs but permit simple solutions to the doublet-triplet splitting problem. Moreover, GUT breaking is triggered by supersymmetry breaking so that the GUT scale is naturally generated as a combination of the Planck scale and the supersymmetry breaking scale.
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