Free Fermion Orientifolds

Abstract

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.

18 pages + Appendix; references added

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• Spinor-Vector Duality in fermionic Z2XZ2 heterotic orbifold models
• Millions of Standard Models on Z6-prime?
• Supersymmetry versus Gauge Symmetry on the Heterotic Landscape
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Cited by in corpus (1)

• (Unoriented) T-folds with few T's