Four-dimensional N=1 Z_N X Z_M Orientifolds

Abstract

We calculate the tadpole equations and their solutions for a class of four-dimensional orientifolds with orbifold group Z_N X Z_M, and we present the massless bosonic spectra of these models. Surprisingly we find no consistent solutions for the models with Z_2 X Z_4 and Z_4 X Z_4 orbifold groups.

18 pages, Latex, slight modifications, appendix containing calculational details somewhat expanded

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