D = 4 , N = 1 orientifolds with vector structure
نویسندگان
چکیده
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 Ω-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. To preserve supersymmetry, one has to choose an oscillator vacuum such that Ω 2 | 95 = +1.
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