GROUP QUASI-REPRESENTATIONS AND INDEX THEORY
GROUP QUASI-REPRESENTATIONS AND INDEX THEORY
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群准表示和指数理论
DOI:
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发表时间:
2012
期刊:
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通讯作者:
M. Dadarlat
中科院分区:
文献类型:
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作者:
M. Dadarlat
Let M be a closed connected manifold and let D be an elliptic operator on M. Let G be a discrete countable group and let be a principal G-bundle. Connes and Moscovici showed that this data defines an analytic index indl1(G)(D) ∈ K0(l1(G)). If B is a unital tracial C*-algebra, we give a formula for the trace of the image of indl1(G)(D) in K0(B) under the map induced by a quasi-representation of G in B. As an application, we reprove and generalize a formula of Exel and Loring to surface groups.