Non-supersymmetric String Models from Anti-D3-/D7-branes in Strongly Warped Throats

TL;DR

This paper explores non-supersymmetric string models using anti-D3-/D7-branes in warped throats, deriving effective theories that incorporate supersymmetry breaking, moduli stabilisation, and potential phenomenological implications.

Contribution

It introduces a framework for constructing non-supersymmetric string models with realistic spectra and hierarchies, including a detailed effective field theory description with supersymmetry breaking effects.

Findings

Derived low-energy effective supergravity theory for these models.

Analyzed the impact of moduli stabilisation on matter sector.

Computed mass and coupling hierarchies relevant for phenomenology.

Abstract

This article discusses model-building scenarios including anti-D3-/D7-branes, in which supersymmetry is broken spontaneously, despite having no scale at which sparticles appear and standard supersymmetry is restored. If the branes are placed on singularities at the tip of warped throats in Calabi-Yau orientifold flux compactifications, they may give rise to realistic particle spectra, closed- and open-string moduli stabilisation with a Minkowski/de Sitter uplift, and a geometrical origin for the scale hierarchies. The paper derives the low-energy effective field theory description for such scenarios, i.e. a non-linear supergravity theory for standard and constrained supermultiplets, including soft supersymmetry-breaking matter couplings. The effect of closed-string moduli stabilisation on the open-string matter sector is worked out, incorporating non-perturbative and perturbative effects, and the mass and coupling hierarchies are computed with a view towards phenomenology.