ZN × ZM orientifolds with and without discrete torsion


We discuss compact four-dimensional ZN × ZM type IIB orientifolds. We take a systematic approach to classify the possible models and construct them explicitely. The supersymmetric orientifolds of this type have already been constructed some time ago. We find that there exist several consistent orientifolds for each of the discrete groups Z2 × Z2, Z2 × Z4… (More)


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