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Journal of High Energy Physics 02 (2009) 030
Free Fermion Orientifolds
E. Kiritsis1, 2, 3, M. Lennek1, B. Schellekens4

We investigate a class of orientifold models based on tensor products of 18 Ising models. Using the same search criteria as for the comparable case of Gepner model orientifolds we find that there are no three-family standard model configurations with tadpole cancellation. Even if we do not impose the latter requirement, we only find one such configuration in the special case of complex free fermions. In order to allow a comparison with other approaches we enumerate the Hodge numbers of the type-IIB theories we obtain. We provide indications that there are fermionic IIB vacua that are not $Z_2\times Z_2$ orbifolds.
1 :  CPHT - Centre de Physique Théorique
2 :  Physics Department
3 :  APC - UMR 7164 - AstroParticule et Cosmologie
4 :  Nikhef
Physique/Physique des Hautes Energies - Théorie
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