D=4, N=1 orientifolds with vector structure

Details D=4, N=1 orientifolds with vector structure D=4, N=1 orientifolds with vector structure

2000-07-11

arxiv.org/abs/hep-th/0007087v2

Nucl.Phys. B596 (2001) 197-230

Physics

High Energy Physics

High Energy Physics - Theory

Latex, 44 pages, 2 figures, v2: misprints and an error concerning Omega^2_{95} corrected, a comment on D5-branes with negative

Scientific paper

10.1016/S0550-3213(00)00698-2

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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