D-brane instantons on non-Spin cycles

TL;DR

This paper demonstrates that non-Spin cycles in type IIB Calabi-Yau orientifolds support orientifold-invariant D-brane instantons, which can generate important non-perturbative superpotential corrections.

Contribution

It reveals the natural support of D-brane instantons on non-Spin cycles in specific compactifications, highlighting their role in non-perturbative effects.

Findings

Non-Spin cycles support orientifold-invariant D-brane instantons.

Instantons associated with the holomorphic cotangent bundle induce superpotential corrections.

Supports the understanding of non-perturbative effects in string compactifications.

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.