arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2111.08798math.AT
收藏

二阶 Hochschild 同调的自然对称性

Natural symmetries of secondary Hochschild homology

David Ayala, John Francis, Adam Howard

AI总结:

本文识别了环面的框架微分同胚群为环面与三股辫群的半直积,证明其作用于二阶迭代 Hochschild 同调,并据此提出不稳定二阶循环结构的定义。

摘要:

我们将环面的框架微分同胚群识别为环面与三股辫群的半直积;同时,我们也以类似的方式识别环面的框架局部微分同胚的拓扑幺半群。由此可知,框架映射类群就是该辫群。我们证明环面的框架微分同胚群作用于二阶迭代 Hochschild 同调,并解释这如何恢复一系列熟悉的对称性。在笛卡尔幺半结构的情形下,我们证明该作用可延拓至环面的框架局部微分同胚的幺半群。基于此,我们提出了不稳定二阶循环结构的一个定义,并证明在笛卡尔幺半设定下,迭代 Hochschild 同调具有这样的结构。

英文摘要:

We identify the group of framed diffeomorphisms of the torus as a semi-direct product of the torus with the braid group on 3 strands; we also identify the topological monoid of framed local-diffeomorphisms of the torus in similar terms. It follows that the framed mapping class group is this braid group. We show that the group of framed diffeomorphisms of the torus acts on twice-iterated Hochschild homology, and explain how this recovers a host of familiar symmetries. In the case of Cartesian monoidal structures, we show that this action extends to the monoid of framed local-diffeomorphisms of the torus. Based on this, we propose a definition of an unstable secondary cyclotomic structure, and show that iterated Hochschild homology possesses such in the Cartesian monoidal setting.

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。

↑