(Non-)BPS bound states and D-brane instantons

Details (Non-)BPS bound states and D-brane instantons (Non-)BPS bound states and D-brane instantons

2008-03-17

arxiv.org/abs/0803.2513v3

JHEP 0807:012,2008

Physics

High Energy Physics

High Energy Physics - Theory

39 pages, 4 tables, 2 figures; v2: Equ. (20) corrected, related discussion adjusted, 1 reference added; v3: JHEP version with

Scientific paper

10.1088/1126-6708/2008/07/012

We study non-perturbative effects in four-dimensional N=1 supersymmetric orientifold compactifications due to D-brane instantons which are generically not invariant under the orientifold projection. We show that they can yield superpotential contributions via a multi-instanton process at threshold. Some constituents of this configuration form bound states away from the wall of marginal stability which can decay in other regions of moduli space. A microscopic analysis reveals how contributions to the superpotential are possible when new BPS states compensate for their decay. We study this concretely for D2-brane instantons along decaying special Lagrangians in Type IIA and for D5-branes instantons carrying holomorphic bundles in Type I theory.

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