Gaugino Condensation in N=1 Supergravity Models with Multiple Dilaton-Like Fields

TL;DR

This paper investigates how multiple dilaton-like fields in N=1 supergravity models influence gaugino condensation and supersymmetry breaking, revealing that gaugino masses can be comparable to the gravitino mass, unlike in single-dilaton models.

Contribution

It develops an effective Lagrangian framework for gaugino condensation in models with multiple dilaton-like fields, extending previous single-field analyses.

Findings

Gaugino masses can be of order the gravitino mass.

Multiple dilaton fields alter the coupling to different sectors.

Contrast with heterotic models with a single dilaton.

Abstract

We study supersymmetry breaking by hidden-sector gaugino condensation in N=1 D=4 supergravity models with multiple dilaton-like moduli fields. Our work is motivated by Type I string theory, in which the low-energy effective Lagrangian can have different dilaton-like fields coupling to different sectors of the theory. We construct the effective Lagrangian for gaugino condensation and use it to compute the visible-sector gaugino masses. We find that the gaugino masses can be of order the gravitino mass, in stark contrast to heterotic string models with a single dilaton field.