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

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.

72 pages + 3 appendices + references, 3 figures; v2: JHEP version, references and clarifications added, typos corrected; v3: corrections in app. B.3 and sssec. 4.3.2 (with corresponding edits, main conclusions unchanged), clarification in sssec. 5.1.1

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• Early Dark Energy in Type IIB String Theory
• Misaligned Supersymmetry and Open Strings
• Modular invariance, misalignment and finiteness in non-supersymmetric strings
• Standard Model from A Supergravity Model with a Naturally Small Cosmological Constant
• Goldstino Condensation?
• Towards Classification of $\mathcal{N}=1$ and $\mathcal{N}=0$ Flipped $SU(5)$ Asymmetric ${\mathbb{Z}}_2\times {\mathbb{Z}}_2$ Heterotic String Orbifolds
• A Novel Solution to the Gravitino Problem