Supersymmetry breaking and weakly vs. strongly coupled string theory

TL;DR

This paper explores supersymmetry breaking in superstring models, focusing on dilaton stabilization, moduli stabilization, and implications for particle masses and gauge unification within a weakly coupled regime.

Contribution

It presents a model incorporating nonperturbative effects for dilaton stabilization and discusses the resulting phenomenological implications in superstring theory.

Findings

Dilaton stabilized at weak coupling

Moduli stabilized at the self-dual point

Implications for particle masses and gauge unification

Abstract

In the context of the field theory limit of superstrings, we consider an almost realistic model of supersymmetry breaking by gaugino condensation which includes, through nonperturbative corrections to the K\"ahler potential, dilaton stabilization at a value compatible with a weak coupling regime. Invariance under modular transformations is ensured through a Green-Schwarz term and string threshold corrections, which lead to moduli stabilization at the self-dual point. We are thus in a position to discuss several issues of physical relevance: gravitino, dilaton and moduli masses, axion, soft supersymmetry breaking parameters and gauge coupling unification.