Supersymmetric Composite Models on Intersecting D-branes
Abstract
We construct supersymmetric composite models of quarks and leptons from type IIA T6/(Z2 x Z2) orientifolds with intersecting D6-branes. In case of T6 = T2 x T2 x T2 with no tilted T2, a composite model of the supersymmetric SU(5) grand unified theory with three generations is constructed. In case of that one T2 is tilted, a composite model with SU(3)c x SU(2)L x U(1)Y gauge symmetry with three generations is constructed. These models are not realistic, but contain fewer additional exotic particles and U(1) gauge symmetries due to the introduction of the compositeness of quarks and leptons. The masses of some exotic particles are naturally generated through the Yukawa interactions among "preons".
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