Strings on eight-orbifolds Original Research Article

We present several examples of image orbifolds with image. We compute their Hodge numbers and consider turning on discrete torsion. We then study supersymmetric compactifications of type II, heterotic, and type I strings on these orbifolds. Heterotic compactifications to image have a B-field tadpole with coefficient given by that of the anomaly polynomial. In the image heterotic with standard embedding the tadpole is absent provided the internal space has a precise value of the Euler number. Guided by their relation to type I, we find tadpole-free image heterotic orbifolds with non-standard embedding.