K3 Orientifolds

Abstract

We study string theory propagating on R^6 times K3 by constructing orientifolds of Type IIB string theory compactified on the T^4/Z_N orbifold limits of the K3 surface. This generalises the Z_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 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 Z_N ALE spaces and D5-branes to instantons in the dual heterotic string theory.

34 pages in harvmac `b' option. Requires epsf.tex for 8 figures. Revised version (to appear in Nucl. Phys. B.) corrects typographical errors

References in corpus (9)

• Dirichlet-Branes and Ramond-Ramond Charges
• D-branes, Quivers, and ALE Instantons
• Consistency Conditions for Orientifolds and D-Manifolds
• A One-Loop Test Of String Duality
• Evidence for Heterotic/Heterotic Duality
• Ten Dimensional Heterotic String as a Soliton
• An Orientifold of Type-IIB Theory on $K3$
• String-String Duality in Ten Dimensions
• Is string theory a theory of strings?

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