Propagators on One-Loop Worldsheets for Orientifolds and Intersecting Branes
arXiv:hep-th/0410177 · doi:10.1088/1126-6708/2005/01/043
Abstract
We obtain the one-loop propagators in superstring theory for the general case when the worldsheet fields satisfy non-trivial holonomy and/or boundary conditions. Non-trivial holonomy arises in orbifold and orientifold backgrounds whereas non-trivial boundary conditions arise in backgrounds containing D-branes of different dimensionality or D-branes intersecting each other at an angle. In our derivation, we use a generalized version of the method of images. Dihedral groups play a crucial role in constructing the one-loop propagators.
27 pages, significantly extended section 3, minor changes to other sections, references added
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