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arXiv 0708.4262math.ATmath.GT
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等变链复形的谱序列与局部系数同调

The spectral sequence of an equivariant chain complex and homology with local coefficients

Stefan Papadima, Alexander I. Suciu

摘要:

本文研究了连通CW-复形X的泛覆盖的(扭曲)等变链复形上的增广理想的幂滤性所对应的谱序列。在这个过程中,我们用H_*(X,\k)的余代数结构来确定d^1微分,用扭系数来确定\k π_1(X)-模结构.特别是,这恢复在对偶形式的结果Reznikov,模p上同调的循环p-覆盖的非球面复合物。这种方法提供了X的所有伽罗瓦覆盖的同调信息。它还产生可计算的上限的上同调群的X,系数在素数幂阶,秩一个本地系统的行列。当X允许极小胞腔剖分时,我们将泛阿贝尔覆盖的等变上链复形的线性化与由H^*(X,\k)的杯积结构产生的Aomoto复形联系起来,从而推广了Cohen和Orlik的一个结果。

英文摘要:

We study the spectral sequence associated to the filtration by powers of the augmentation ideal on the (twisted) equivariant chain complex of the universal cover of a connected CW-complex X. In the process, we identify the d^1 differential in terms of the coalgebra structure of H_*(X,\k), and the \kπ_1(X)-module structure on the twisting coefficients. In particular, this recovers in dual form a result of Reznikov, on the mod p cohomology of cyclic p-covers of aspherical complexes. This approach provides information on the homology of all Galois covers of X. It also yields computable upper bounds on the ranks of the cohomology groups of X, with coefficients in a prime-power order, rank one local system. When X admits a minimal cell decomposition, we relate the linearization of the equivariant cochain complex of the universal abelian cover to the Aomoto complex, arising from the cup-product structure of H^*(X,\k), thereby generalizing a result of Cohen and Orlik.

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