Nambu mass hierarchies in low energy string models

TL;DR

This paper investigates how Nambu's mechanism can generate hierarchies among Yukawa couplings in low-energy string models, using geometrical constraints and dynamical minimization within supergravity frameworks.

Contribution

It introduces a novel approach to Yukawa hierarchy generation via Nambu's idea in the context of no-scale supergravity and string models, emphasizing the role of geometrical constraints.

Findings

Yukawa couplings are homogeneous functions of moduli.

A geometrical constraint influences the Nambu mechanism.

Yukawas are determined dynamically through minimization.

Abstract

This paper explores a recent idea of Nambu to generate hierarchies among Yukawa couplings in the context of effective supergravity and superstrings models. The Yukawa couplings are homogeneous functions of the moduli and a geometrical constraint between them with a crucial role in the Nambu mechanism is found in a class of models of no-scale type. The Yukawas are dynamical variables at low energy to be determined by a minimization process. (Based on the talk given at ICHEP94, Glasgow, july 1994)