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arXiv 1405.2247math.KT
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Hochschild(余)同调与Koszul对偶

Hochschild (co)homology and Koszul duality

Estanislao Herscovich

摘要:

本文讨论了Hochschild(上)同调和Koszul对偶理论的两个不同但相关的结果。一方面,我们从本质上证明了Adams连通增广dg代数的Tamarkin-Tsygan演算与其Koszul对偶的Tamarkin-Tsygan演算是对偶的.这利用了这样一个事实,即Hochschild上同调和同调可以被看作是一些自然(增广)dg代数和dg模在前者上的扭曲构造。特别地,从这些构造可以得出,Koszul代数的Hochschild上同调的上积和霍赫希尔德同调的卡积的计算是直接从Tor(k,k)群的余代数结构计算的(这些结果中的第一个由R. O. Buchweitz,E.格林,北Snashall和O. Solberg)。通过研究A_无限代数的扭理论,我们将这种情况推广到更一般的代数上,计算出了Hochschild上同调的代数结构。

英文摘要:

In this article we discuss two different but related results on Hochschild (co)homology and the theory of Koszul duality. On the one hand, we prove essentially that the Tamarkin-Tsygan calculus of an Adams connected augmented dg algebra and of its Koszul dual are dual. This uses the fact that Hochschild cohomology and homology may be regarded as a twisted construction of some natural (augmented) dg algebras and dg modules over the former. In particular, from these constructions it follows that the computation of the cup product on Hochschild cohomology and cap product on Hochschild homology of a Koszul algebra is directly computed from the coalgebra structure of the Tor(k,k) group (the first of these results is proved differently by R.-O. Buchweitz, E. Green, N. Snashall and O. Solberg). We even generalize this situation by studying twisting theory of A_infinity-algebras to compute the algebra structure of Hochschild cohomology of more general algebras.

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