Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2007-11-10
Physics
High Energy Physics
High Energy Physics - Phenomenology
Based on lectures given at the Summer Institute 2007, Fuji-Yoshida, Japan. The slides can be found at http://wwwhep.s.kanaza
Scientific paper
Grand unified models in four dimensions typically suffer from the doublet-triplet splitting problem. This obstacle can be overcome in higher-dimensional settings, where a non-trivial gauge group topography can explain the simultaneous appearance of complete standard model generations in the form of 16-plets of SO(10) and the Higgs fields as split multiplets. In these notes, the emerging scheme of `local grand unification' and its realization in the context of orbifold compactifications of the heterotic string are reviewed.
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