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We study string theory propagating on R 6 K3 by constructing orientifolds of Type IIB string theory compactified on the T 4 /Z N orbifold limits of the K3 surface. This generalises theZ 2 case studied previously. The orientifold models studied may be divided into two broad categories, sometimes related by T-duality. Models in category A require either both D5- and...
We consider the propagation of type I open superstrings on orbifolds with four non-compact dimensions and N = 1 supersymmetry. In this paper, we concentrate on a non-trivial Z 2 Z 2 example. We show that consistency conditions, arising from tadpole cancellation and algebraic sources, require the existence of three sets of Dirichlet 5-branes. We discuss fully the enhancements of...
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