Dynamical Generation of Yukawa Couplings in Intersecting D-brane Models

TL;DR

This paper introduces a mechanism in supersymmetric intersecting D-brane models to generate realistic Yukawa couplings for quarks and leptons through string-level interactions and preon confinement dynamics.

Contribution

It presents a novel scenario where Yukawa matrices arise from higher-dimensional string interactions and preon confinement in a specific D-brane model.

Findings

Constructed an explicit model with four quark-lepton generations and two Higgs pairs.

Demonstrated non-trivial Yukawa matrices emerge from preon interactions and confinement.

Showed all matter fields can be composite within this framework.

Abstract

We propose a scenario to obtain non-trivial Yukawa coupling matrices for the quark-lepton mass generation in supersymmetric intersecting D-brane models in type IIA T^6/Z_2 x Z_2 orientifold. As an example, an explicit model is constructed in which all the four generations of quarks and leptons and two pairs of massless Higgs fields are composite. In this model non-trivial Yukawa interactions are obtained by the interplay between the string-level higher dimensional interactions among "preons" and the dynamics of the confinement of "preons".