Instanton Induced Open String Superpotentials and Branes at Singularities

Abstract

We study different aspects of the non-perturbative superpotentials induced by Euclidean E3-branes on systems of D3/D7-branes located at Abelian orbifold singularities. We discuss in detail how the induced couplings are consistent with the U(1) symmetries carried by the D3/D7-branes. We construct different compact and non-compact examples, and show phenomenologically relevant couplings like $\mu$-terms or certain Yukawa couplings generated by these E3 instantons. Some other novel effects are described. We show an example where E3-instantons combine with standard gauge instantons to yield new multi-instanton effects contributing to superpotential, along the lines of ref.\cite{geu}. In the case of non-SUSY $Z_N$ tachyon-free singularities it is shown how E3-instantons give rise to non perturbative scalar couplings including exponentially suppressed scalar bilinears.

41 pages, 2 figures

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• Simple Stringy Dynamical SUSY Breaking
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• Non-perturbative superpotentials across lines of marginal stability

Cited by in corpus (14)

• Moduli Stabilisation versus Chirality for MSSM like Type IIB Orientifolds
• Yukawa Structure from U(1) Fluxes in F-theory Grand Unification
• Towards Realistic String Vacua From Branes At Singularities
• Gauge Mediation in F-Theory GUT Models
• Power Towers of String Instantons for N=1 Vacua
• Non-perturbative F-terms across lines of BPS stability
• Stringy Instantons and Yukawa Couplings in MSSM-like Orientifold Models
• Dynamical supersymmetry breaking from unoriented D-brane instantons
• Non-perturbative effective interactions from fluxes
• E3-brane instantons and baryonic operators for D3-branes on toric singularities
• D-brane instanton effects in Type II orientifolds: local and global issues
• Neutrino Masses, Baryon Asymmetry, Dark Matter and the Moduli Problem : A Complete Framework
• Cosmic Strings with Small Tension
• One-loop and D-instanton corrections to the effective action of open string models