# Orientifolds with discrete torsion

@article{Klein2000OrientifoldsWD, title={Orientifolds with discrete torsion}, author={Mathias Klein and Raul Rabadan}, journal={Journal of High Energy Physics}, year={2000}, volume={2000}, pages={040-040} }

We show how discrete torsion can be implemented in D = 4, = 1 type-IIB orientifolds. Some consistency conditions are found from the closed string and open string spectrum and from tadpole cancellation. Only real values of the discrete torsion parameter are allowed, i.e. = ±1. Orientifold models are related to real projective representations. In a similar way as complex projective representations are classified by H2(Γ,*) = H2(Γ,U(1)), real projective representations are characterized by H2… CONTINUE READING

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