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Título : Instanton Induced Open String Superpotentials and Branes at Singularities
Autor : Ibáñez, Luis E. ; Uranga Urteaga, Ángel M.
Palabras clave : High Energy Physics - Theory
Fecha de publicación : 8-nov-2007
Citación : arXiv:0711.1316v1 [hep-th]
Serie : IFT-UAM/CSIC-07-57
CERN-PH-TH/2007-215
Resumen: 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.[28]. 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.
Descripción : 41 pages, 2 figures.
URI : http://hdl.handle.net/10261/5517
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