Supersymmetric ZN×ZM orientifolds in 4D with D-branes at angles

@article{Forste2000SupersymmetricZO,
  title={Supersymmetric ZN×ZM orientifolds in 4D with D-branes at angles},
  author={Stefan Forste and Gabriele Honecker and Ralph Schreyer},
  journal={Nuclear Physics},
  year={2000},
  volume={593},
  pages={127-154}
}
We construct orientifolds of type IIA string theory. The theory is compactified on a T 6 /ZN × ZM 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. 

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