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Gauge Unification and Flavor Hierarchy from Extra Dimensions

Kiwoon Choi
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Abstract

Extra dimension provides an attractive way to break symmetry by boundary conditions which can be useful to construct a natural grand unified theory avoiding the doublet-triplet splitting problem and the proton decay problem. It can provide also an elegant mechanism to generate hierarchical 4-dimensional Yukawa couplings, involving the quasi-localization of matter fields in extra dimension. We discuss the Kaluza-Klein threshold corrections to low energy gauge couplings in generic 5-dimensional orbifold grand unified theories with quasi-localized matter fields, and apply the results to some class of SU(5) models on $S^1/Z_2\times Z_2$.

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Kiwoon Choi. 2004-01-04. Gauge Unification and Flavor Hierarchy from Extra Dimensions. https://arxiv.org/abs/hep-ph/0401011

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