D-brane instantons on non-Spin cycles
arXiv:1210.1221 · doi:10.1007/JHEP01(2013)056
Abstract
We show that non-Spin cycles in type IIB Calabi-Yau orientifold compactifications with vanishing B field naturally support orientifold-invariant D-brane instantons. These instantons, associated to the holomorphic cotangent bundle of the non-Spin cycle, can lead to non-perturbative corrections to the superpotential.
10 pages. v3: version to appear in JHEP