Abstract
AbstractWe give a pedagogical introduction to D‐brane instanton effects in vacuum configurations with open and unoriented strings. We focus on quiver gauge theories for unoriented D‐branes at orbifold singularities and describe in some detail the ℤ3 case, where both ‘gauge’ and ‘exotic’ instantons can generate non‐perturbative super potentials, and the ℤ5 case, where supersymmetry breaking may arise from the combined effect of ‘gauge’ instantons and a FI D‐term.
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