Loop groups and twisted K-theory I

Details Loop groups and twisted K-theory I Loop groups and twisted K-theory I

2007-11-13

arxiv.org/abs/0711.1906v1

Mathematics

Algebraic Topology

Scientific paper

This is the first in a series of papers investigating the relationship between the twisted equivariant K-theory of a compact Lie group G and the "Verlinde ring" of its loop group. In this paper we set up the foundations of twisted equivariant K-groups, and more generally twisted K-theory of groupoids. We establish enough basic properties to make effective computations. Using the Mayer-Vietoris spectral sequence we compute the twisted equivariant K-groups of a compact connected Lie group G with torsion free fundamental group. We relate this computation to the representation theory of the loop group at a level related to the twisting.

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