paper

A chiral Borel-Weil-Bott theorem

arXiv:0903.1281

Abstract

We compute the cohomology of modules over the algebra of twisted chiral differential operators over the flag manifold. This is applied to (1) finding the character of -integrable irreducible highest weight modules over the affine Lie algebra at the critical level, and (2) computing a certain elliptic genus of the flag manifold. The main tool is a result that interprets the Drinfeld-Sokolov reduction as a derived functor.

Some considerable reworking. A final version to appear in Adv. in Math

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