Intersecting Brane World from Type I Compactification

Details Intersecting Brane World from Type I Compactification Intersecting Brane World from Type I Compactification

2006-10-02

arxiv.org/abs/hep-th/0610026v1

Int.J.Mod.Phys.A22:3169-3200,2007

Physics

High Energy Physics

High Energy Physics - Theory

31 pages, 5 figures

Scientific paper

10.1142/S0217751X07036786

We elaborate that general intersecting brane models on orbifolds are obtained from type I string compactifications and their T-duals. Symmetry breaking and restoration occur via recombination and parallel separation of branes, preserving supersymmetry. The Ramond-Ramond tadpole cancelation and the toron quantization constrain the spectrum as a branching of the adjoints of SO(32), up to orbifold projections. Since the recombination changes the gauge coupling, the single gauge coupling of type I could give rise to different coupling below the unification scale. This is due to the nonlocal properties of the Dirac-Born-Infeld action. The weak mixing angle sin^2 theta_W = 3/8 is naturally explained by embedding the quantum numbers to those of SO(10).

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