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Flavor structure and coupling selection rule from intersecting D-branes
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We study flavor structure and the coupling selection rule in intersecting D-brane configurations. We formulate the selection rule for Yukawa couplings and its extensions to generic n-point couplings. We investigate the possible flavor structure, which can appear from intersecting D-brane configuration, and it is found that their couplings are determined by discrete abelian symmetry. Our studies on the flavor structure and the coupling selection rule show that the minimal matter content of the supersymmetric standard model would have difficulty to derive realistic Yukawa matrices from stringy 3-point couplings at the tree-level. However, extended models have a richer structure, leading to non-trivial mass matrices.
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Quantum aspects of non-invertible flavor symmetries in intersecting/magnetized D-brane models
In magnetized and intersecting D-brane models on T^2/Z2, the D4 symmetry from a non-invertible flavor symmetry survives loop corrections and instanton-generated n-point couplings for even fluxes with trivial Scherk-Sc...
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