Riemann-Roch-Hirzebruch integral formula for characters of reductive Lie groups

Details Riemann-Roch-Hirzebruch integral formula for characters of reductive Lie groups Riemann-Roch-Hirzebruch integral formula for characters of reductive Lie groups

2003-12-25

arxiv.org/abs/math/0312454v2

Mathematics

Representation Theory

published in Representation Theory, 18 pages, LaTeX, no figures

Scientific paper

Let G_R be a real reductive Lie group acting on a manifold M. M.Kashiwara and W.Schmid in [KaSchm] constructed representations of G_R using sheaves and quasi-G_R-equivariant D-modules on M. In this article we prove an integral character formula for these representations (Theorem 1). Our main tools will be the integral localization formula recently proved in [L3] and the integral character formula proved by W.Schmid and K.Vilonen in [SchV2] (originally established by W. Rossmann in [Ro]) in the important special case when the manifold M is the flag variety of the complexified Lie algebra of G_R. In the special case when G_R is commutative and the D-module is the sheaf of sections of a G_R-equivariant line bundle over M this integral character formula will reduce to the classical Riemann-Roch-Hirzebruch formula. As an illustration we give a concrete example on the enhanced flag variety.

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