# Stability and vacuum energy in open string models with broken supersymmetry

## TL;DR

This paper constructs non-tachyonic open string models with broken supersymmetry that have stable moduli and small one-loop potentials, providing a framework to explore swampland conjectures.

## Contribution

It introduces new type I string models with broken supersymmetry, stabilized moduli, and exponentially small potentials, including models with runaway behavior.

## Key findings

- Models are non-tachyonic with small one-loop potentials.
- All open string moduli can be stabilized.
- Some models exhibit runaway positive potentials.

## Abstract

We construct type I string models with supersymmetry broken by compactification that are non-tachyonic and have exponentially small effective potential at one-loop. All open string moduli can be stabilized, while the closed string moduli remain massless at one-loop. The backgrounds of interest have rigid Wilson lines by the use of stacked branes, and some models should have heterotic duals. We also present non-tachyonic backgrounds with positive potentials of runaway type at one-loop. This class of models could be used to test various swampland conjectures.