Yukawa Coupling Structure in Intersecting D-brane Models

TL;DR

This paper explores how Yukawa coupling matrices can be dynamically generated in intersecting D-brane models, leading to more realistic flavor structures in string theory compactifications.

Contribution

It introduces a new flavor structure mechanism in intersecting D-brane models that results in realistic Yukawa matrices, overcoming limitations of conventional models.

Findings

Yukawa matrices can be dynamically generated in new D-brane models.

The models produce nontrivial, potentially realistic Yukawa structures.

Conventional models struggle with realistic flavor structures.

Abstract

The structure of Yukawa coupling matrices is investigated in type IIA T^6/(Z_2 x Z_2) orientifold models with intersecting D-branes. Yukawa coupling matrices are difficult to be realistic in the conventional models in which the generation structure emerges by the multiple intersection of D-branes in the factorized T^6 = T^2 x T^2 x T^2. We study the new type of flavor structure, where Yukawa couplings are dynamically generated, and show this type of models lead to nontrivial structures of Yukawa coupling matrices, which can be realistic.