Local Grand Unification

Details Local Grand Unification Local Grand Unification

2005-12-24

arxiv.org/abs/hep-ph/0512326v2

Physics

High Energy Physics

High Energy Physics - Phenomenology

14 pages, 9 figures. Based on talks presented at the GUSTAVOFEST, Lisbon, July 2005, and at the workshop `Strings and the real

Scientific paper

In the standard model matter fields form complete representations of a grand unified group whereas Higgs fields belong to incomplete `split' multiplets. This remarkable fact is naturally explained by `local grand unification' in higher-dimensional extensions of the standard model. Here, the generations of matter fields are localized in regions of compact space which are endowed with a GUT gauge symmetry whereas the Higgs doublets are bulk fields. We realize local grand unification in the framework of orbifold compactifications of the heterotic string, and we present an example with SO(10) as a local GUT group, which leads to the supersymmetric standard model as an effective four-dimensional theory. We also discuss different orbifold GUT limits and the unification of gauge and Yukawa couplings.

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