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K3 Orientifolds

Eric G. Gimon, Clifford V. Johnson

hep-tharXiv:hep-th/9604129

Abstract

We study string theory propagating on R6 times K3 by constructing orientifolds of Type IIB string theory compactified on the T4/ZN orbifold limits of the K3 surface. This generalises the Z2 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 D9-branes, or only D9-branes, for consistency. Models in category B require either only D5-branes, or no D-branes at all. This latter case is an example of a consistent purely closed unoriented string theory. The spectra of the resulting six dimensional N=1 supergravity theories are presented. Precise statements are made about the relation of the ZN ALE spaces and D5-branes to instantons in the dual heterotic string theory.

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