(Non-)BPS bound states and D-brane instantons
Abstract
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.
Cite
@article{arxiv.0803.2513,
title = {(Non-)BPS bound states and D-brane instantons},
author = {Mirjam Cvetic and Robert Richter and Timo Weigand},
journal= {arXiv preprint arXiv:0803.2513},
year = {2009}
}
Comments
39 pages, 4 tables, 2 figures; v2: Equ. (20) corrected, related discussion adjusted, 1 reference added; v3: JHEP version with more refs added