Supersymmetric Composite Models on Intersecting D-branes

TL;DR

This paper constructs supersymmetric composite models of quarks and leptons using intersecting D-branes in type IIA string theory, leading to models with fewer exotic particles and natural mass generation for some exotics.

Contribution

It presents new supersymmetric composite models based on intersecting D-branes that reduce exotic particles and incorporate quark and lepton compositeness.

Findings

Constructed supersymmetric SU(5) GUT model with three generations.

Developed models with Standard Model gauge symmetry and three generations.

Achieved natural mass generation for some exotic particles.

Abstract

We construct supersymmetric composite models of quarks and leptons from type IIA T^6/(Z_2 x Z_2) orientifolds with intersecting D6-branes. In case of T^6 = T^2 x T^2 x T^2 with no tilted T^2, a composite model of the supersymmetric SU(5) grand unified theory with three generations is constructed. In case of that one T^2 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".