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Abstract: We study the effects produced by D-brane instantons on the holomorphicquantities of a D-brane gauge theory at an orbifold singularity. These effectsare not limited to reproducing the well known contributions of the gauge theoryinstantons but also generate extra terms in the superpotential or theprepotential. On these brane instantons there are some neutral fermioniczero-modes in addition to the ones expected from broken supertranslations. Theyare crucial in correctly reproducing effects which are dual to gauge theoryinstantons, but they may make some other interesting contributions vanish. Weanalyze how orientifold projections can remove these zero-modes and thus allowfor new superpotential terms. These terms contribute to the dynamics of theeffective gauge theory, for instance in the stabilization of runawaydirections.

Autor: Riccardo Argurio, Matteo Bertolini, Gabriele Ferretti, Alberto Lerda, Christoffer Petersson


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