Mathematics – Differential Geometry
Scientific paper
2007-07-26
Enseign. Math. (2) 55 (2009), no. 1-2, 33-75
Mathematics
Differential Geometry
32 pages
Scientific paper
Let G be a compact, simple, simply connected Lie group. A theorem of Freed-Hopkins-Teleman identifies the level k fusion ring R_k(G) of G with the twisted equivariant K-homology at level k+h, where h is the dual Coxeter number. In this paper, we review this result using the language of Dixmier-Douady bundles. We show that the additive generators of the group R_k(G) are obtained as K-homology push-forwards of the fundamental classes of conjugacy classes in G.
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