D=4, N=1 orientifolds with vector structure
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.
Keywords
Cite
@article{arxiv.hep-th/0007087,
title = {D=4, N=1 orientifolds with vector structure},
author = {Matthias Klein and Raul Rabadan},
journal= {arXiv preprint arXiv:hep-th/0007087},
year = {2009}
}
Comments
Latex, 44 pages, 2 figures, v2: misprints and an error concerning Omega^2_{95} corrected, a comment on D5-branes with negative NSNS charge added, references and acknowledgements added