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Abstract: We study non-perturbative effects in four-dimensional N=1 supersymmetricorientifold compactifications due to D-brane instantons which are genericallynot invariant under the orientifold projection. We show that they can yieldsuperpotential contributions via a multi-instanton process at threshold. Someconstituents of this configuration form bound states away from the wall ofmarginal stability which can decay in other regions of moduli space. Amicroscopic analysis reveals how contributions to the superpotential arepossible when new BPS states compensate for their decay. We study thisconcretely for D2-brane instantons along decaying special Lagrangians in TypeIIA and for D5-branes instantons carrying holomorphic bundles in Type I theory.



Autor: Mirjam Cvetic, Robert Richter, Timo Weigand

Fuente: https://arxiv.org/







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