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arXiv 2006.13871math.RTmath.RA
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Hochschild上同调的限制李代数结构的稳定不变性

Stable invariance of the restricted Lie algebra structure of Hochschild cohomology

Benjamin Briggs, Lleonard Rubio y Degrassi

摘要:

证明了Hochschild上同调的限制李代数结构在自内射代数之间的Morita型稳定等价下是不变的.从而得到了一些正的特征稳定不变量,如$\mathrm{HH}^1(A,A)$的$p$ -toral秩.利用Morita型稳定等价的更一般的概念,我们还证明了关于Iwanaga-Gorenstein代数的一个更一般的结果.给出了交换代数和模表示理论的几个应用。这些结果通过首先建立Hochschild上链复形的$B_\infty$ -结构的稳定不变性得到证明。在附录中,我们解释了如何$p$ -幂运算Hochschild上同调可以被看作是这个$B_\infty$ -结构的一个伪像。特别是,我们建立了良好的定义的$p$ -电源操作,以下一些-原来的拓扑方法由于五月,科恩和Turchin,使用语言的操作。

英文摘要:

We show that the restricted Lie algebra structure on Hochschild cohomology is invariant under stable equivalences of Morita type between self-injective algebras. Thereby we obtain a number of positive characteristic stable invariants, such as the $p$-toral rank of $\mathrm{HH}^1(A,A)$. We also prove a more general result concerning Iwanaga-Gorenstein algebras, using a more general notion of stable equivalences of Morita type. Several applications are given to commutative algebra and modular representation theory. These results are proven by first establishing the stable invariance of the $B_\infty$-structure of the Hochschild cochain complex. In the appendix we explain how the $p$-power operation on Hochschild cohomology can be seen as an artifact of this $B_\infty$-structure. In particular, we establish well-definedness of the $p$-power operation, following some -- originally topological -- methods due to May, Cohen and Turchin, using the language of operads.

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