1210.1221 (Per Berglund et al.)

D-brane instantons on non-Spin cycles    [PDF]

Per Berglund, Iñaki García-Etxebarria

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.

View original: http://arxiv.org/abs/1210.1221