Orbifold Family Unification
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We study the possibility of complete family unification in higher-dimensional space-time. Three families of matters in SU(5) grand unified theory are derived from a single bulk multiplet of SU(N) gauge group (N >= 9) in the framework of S^1/Z_2 orbifold models. In the case of the direct orbifold breaking down to the standard model gauge group, there are models in which bulk fields from a single multiplet and a few brane fields compose three families of quarks and leptons.
Comments added, version to appear in Physical Review D (v3); References added (v2); 19 pages (v1)
Comments added, version to appear in Physical Review D (v3); References added (v2); 19 pages (v1)