Open descendants of non-diagonal invariants

Abstract

The open descendants of simple current automorphism invariants are constructed. We consider the case where the order of the current is two or odd. We prove that our solutions satisfy the completeness conditions, positivity and integrality of the open and closed sectors and the Klein bottle constraint (apart from an interesting exception). In order to do this, we derive some new relations between the tensor Y and the fixed point conformal field theory. Some non-standard Klein After a ten year period of neglect, open strings have received more interest recently for a variety of reasons: their rôle in the duality picture, the discovery of D-branes and the appearance of non-commutative geometry, and recent developments in phenomenological string theory, such as brane worl