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Consistency Conditions for Branes at Orbifold Singularities

Julie D. Blum, Kenneth Intriligator

hep-tharXiv:hep-th/9705030

Abstract

We discuss consistency conditions for branes at orbifold singularities. The conditions have a world-sheet interpretation in terms of tadpole cancellation and a space-time interpretation in terms of anomalies. As examples, we consider type II and type I branes on C2/ZM orbifolds. We give orientifold constructions of phases of type I or heterotic string theory, involving branches with extra tensor multiplets, which arise when small SO(32) instantons sit on orbifold singularities.

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