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arXiv · 0711.1316

Instanton Induced Open String Superpotentials and Branes at Singularities

L. E. Ibanez·A. M. Uranga
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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 $μ$-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.

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L. E. Ibanez, A. M. Uranga. 2007-11-08. Instanton Induced Open String Superpotentials and Branes at Singularities. https://doi.org/10.1088/1126-6708%2F2008%2F02%2F103

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