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Equivariant Kasparov theory of finite groups via Mackey functors

机译:通过Mackey函子的有限群的等变Kasparov理论

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摘要

Let G be any finite group. In this paper we systematically exploit general homological methods in order to reduce the computation of G-equivariant KK-theory to topological equivariant K-theory. The key observation is that the functor on KK~G that assigns to a G-C*- algebra A the collection of its K-theory groups {K_*~H (A): H ≤ G} admits a lifting to the abelian category of Z/2-graded Mackey modules over the representation Green functor for G; moreover, this lifting is the universal exact homological functor for the resulting relative homological algebra in KK~G. It follows that there is a spectral sequence abutting to KK_*~G (A, B), whose second page displays Ext groups computed in the category of Mackey modules. Due to the nice properties of Mackey functors, we obtain a similar Künneth spectral sequence which computes the equivariant K-theory groups of a tensor product A×B. Both spectral sequences behave nicely if A belongs to the localizing subcategory of KK~G generated by the algebras C(G/H) for all subgroups H ≤ G.
机译:令G为任何有限群。在本文中,我们系统地利用一般的同源方法,以将G等变KK理论的计算量减少到拓扑等变K理论。关键的观察结果是,KK〜G上的函子将其K理论组{K_ *〜H(A):H≤G}的集合分配给GC *-代数A,从而使Z的阿贝尔类别提升。对G表示的绿色函子表示为Mackey模块的/ 2-等级;此外,这种提升是在KK〜G中产生的相对同源代数的通用精确同源函子。因此,有一个频谱序列与KK_ *〜G(A,B)相邻,其第二页显示了在Mackey模块类别中计算的Ext组。由于Mackey函子的优良性质,我们获得了相似的Künneth谱序列,该序列计算张量积A×B的等变K理论组。如果A属于由代数C(G / H)生成的所有子群H≤G的KK〜G的局部子类别,则两个光谱序列均表现良好。

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