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arXiv 1706.08992math.KTmath.DGmath.OA
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循环同调与群作用

Cyclic Homology and Group Actions

Raphael Ponge

摘要:

在本文中,我们提出了明确的拟同构的建设,计算与(离散)群作用相关的交叉积代数的循环同调和周期循环同调。第一部分研究了环$k\supset \mathbb{Q}$上酉代数上与群作用有关的代数叉积。在第二部分中,我们将结果推广到局部凸代数上的作用。然后,我们处理交叉产品与群作用流形和光滑簇。对于有限阶分量,我们称之为“混合等变上同调”。这种“混合”理论在群同调和德·拉姆上同调之间起中介作用。它是自然相关的等变上同调,所以我们得到明确的建设循环圈的等变特征类。对于无穷阶分量,我们简化并纠正了Crainic的错误识别。一个重要的新的同调工具是“三角$S$ -模”的概念。这是Getzler-Jones圆柱形复合体的自然推广。它将Burghelea-Kassel的混合复合物和Getzler-Jones的副链复合物与Kassel-Jones的$S$ -模结合起来。存在与三角形$S$ -模自然相关的谱序列。特别是,这使我们能够恢复谱序列Feigin-Tsygan和Getzler-Jones,并导致我们一个新的谱序列。

英文摘要:

In this paper we present the construction of explicit quasi-isomorphisms that compute the cyclic homology and periodic cyclic homology of crossed-product algebras associated with (discrete) group actions. In the first part we deal with algebraic crossed-products associated with group actions on unital algebras over any ring $k\supset \mathbb{Q}$. In the second part, we extend the results to actions on locally convex algebras. We then deal with crossed-products associated with group actions on manifolds and smooth varieties. For the finite order components, the results are expressed in terms of what we call "mixed equivariant cohomology". This "mixed" theory mediates between group homology and de Rham cohomology. It is naturally related to equivariant cohomology, and so we obtain explicit constructions of cyclic cycles out of equivariant characteristic classes. For the infinite order components, we simplify and correct the misidentification of Crainic. An important new homological tool is the notion of "triangular $S$-module". This is a natural generalization of the cylindrical complexes of Getzler-Jones. It combines the mixed complexes of Burghelea-Kassel and parachain complexes of Getzler-Jones with the $S$-modules of Kassel-Jones. There are spectral sequences naturally associated with triangular $S$-modules. In particular, this allows us to recover spectral sequences Feigin-Tsygan and Getzler-Jones and leads us to a new spectral sequence.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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