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Abstract: In this note, we study D-brane instantons which intersect N=1 supersymmetricconfigurations of space-filling D-branes in general Calabi-Yaucompactifications of type IIB string theory. Our focus is on rigid ``stringyinstantons- those which cannot be interpreted as Yang-Mills instantons in anon-Abelian gauge group on any stack of space-filling D-branes. We show thattheir contributions to the space-time superpotential can be determined by atopological B-model computation of the tree-level superpotential for a relatedauxiliary brane system. This computation is very tractable, as it is governedby an A-infinity structure. We summarize the stringy instanton contribution tothe space-time superpotential in a simple formula.



Autor: Shamit Kachru, Dusan Simic

Fuente: https://arxiv.org/







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