Twisted Open Strings from Closed Strings: The WZW Orientation Orbifolds
Abstract
Including world-sheet orientation-reversing automorphisms hσ ∈ H- in the orbifold program, we construct the operator algebras and twisted KZ systems of the general WZW orientation orbifold Ag (H-) /H-. We find that the orientation-orbifold sectors corresponding to each hσ ∈ H- are twisted open WZW strings, whose properties are quite distinct from conventional open-string orientifold sectors. As simple illustrations, we also discuss the classical (high-level) limit of our construction and free-boson examples on abelian g.
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