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arXiv · hep-th/0007087

D=4, N=1 orientifolds with vector structure

Matthias Klein·Raul Rabadan
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Abstract

We construct compact type IIB orientifolds with discrete groups Z_4, Z_6, Z_6', Z_8, Z_12 and Z_12'. These models are N=1 supersymmetric in D=4 and have vector structure. The possibility of having vector structure in Z_N orientifolds with even N arises due to an alternative Omega-projection in the twisted sectors. Some of the models without vector structure are known to be inconsistent because of uncancelled tadpoles. We show that vector structure leads to a sign flip in the twisted Klein bottle contribution. As a consequence, all the tadpoles can be cancelled by introducing D9-branes and D5-branes.

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Matthias Klein, Raul Rabadan. 2000-08-22. D=4, N=1 orientifolds with vector structure. https://doi.org/10.1016/s0550-3213(00)00698-2

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