Supersymmetric Z_N times Z_M Orientifolds in 4D with D-Branes at Angles

TL;DR

This paper constructs four-dimensional N=1 supersymmetric orientifold models from type IIA string theory compactified on T^6/Z_N×Z_M orbifolds, incorporating D-branes at angles to satisfy tadpole cancellation.

Contribution

It introduces a new class of supersymmetric orientifold models with specific orbifold and D-brane configurations in four dimensions.

Findings

Models are N=1 supersymmetric and non-chiral.

D-branes at angles are necessary for tadpole cancellation.

Explicit construction of orientifolds on T^6/Z_N×Z_M.

Abstract

We construct orientifolds of type IIA string theory. The theory is compactified on a T^6/Z_N times Z_M orbifold. In addition worldsheet parity in combination with a reflection of three compact directions is modded out. Tadpole cancellation requires to add D-6-branes at angles. The resulting four dimensional theories are N=1 supersymmetric and non-chiral.