Unoriented D-brane instantons
Massimo Bianchi, Gianluca Inverso
TL;DR
This paper provides a pedagogical overview of D-brane instanton effects in unoriented string theories, focusing on their role in generating non-perturbative superpotentials and supersymmetry breaking in specific orbifold models.
Contribution
It introduces the effects of D-brane instantons in unoriented string setups, with detailed analysis of Z_3 and Z_5 orbifold cases, highlighting their impact on superpotentials and supersymmetry.
Findings
Gauge and exotic instantons generate non-perturbative superpotentials.
Supersymmetry breaking can occur from combined instanton and D-term effects.
Detailed analysis of Z_3 and Z_5 orbifold models.
Abstract
We 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 Z_3 case, where both `gauge' and `exotic' instantons can generate non-perturbative super potentials, and the Z_5 case, where supersymmetry breaking may arise from the combined effect of `gauge' instantons and a FI D-term.
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