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Supersymmetric Intersecting Branes on the Type IIA T^6/Z_4 orientifold
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We study supersymmetric intersecting D6-branes wrapping 3-cycles in the Type IIA T^6/Z_4 orientifold background. As a new feature, the 3-cycles in this orbifold space arise both from the untwisted and the Z_2 twisted sectors. We present an integral basis for the homology lattice, H_3(M,Z), in terms of fractional 3-cycles, for which the intersection form involves the Cartan matrix of E8. We show that these fractional D6-branes can be used to construct supersymmetric brane configurations realizing a three generation Pati-Salam model. Via brane recombination processes preserving supersymmetry, this GUT model can be broken down to a standard-like model.
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Three-Family Supersymmetric Pati-Salam Flux Models from Rigid D-Branes
New three-family Pati-Salam flux models from rigid D-branes in Type IIB on T^6/(Z2 x Z2) stabilize moduli via G3 flux and meet N=1 supersymmetry, RR tadpole, and K-theory constraints.
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