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arXiv 2103.15772math.QAmath.RT
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有限张量范畴的迹域论

The Trace Field Theory of a Finite Tensor Category

Christoph Schweigert, Lukas Woike

摘要:

给定一个有限张量范畴$\mathcal{C}$,证明了将Nakayama函子平凡化为右$\mathcal{C}$ -模函子,可以得到投射对象张量理想上的修正迹.使用的结果Costello,这使我们能够关联到任何有限张量类别配备了这样一个平凡化的中山函子链复形值拓扑共形域论,跟踪域论。迹域论拓扑地描述了修正迹,即Hattori-Stallings迹,以及它们在$\mathcal{C}$的Hochschild复形上诱导的结构.在这篇文章中,我们专注于在线性(而不是微分分次)设置的影响:我们使用迹域论定义一个非单位同伦交换产品的度为零的Hochschild链。此积是块对角的,可以通过迹域论的柄元来描述。取句柄元素的修改后的迹线恢复$\mathcal{C}$的Cartan矩阵。

英文摘要:

Given a finite tensor category $\mathcal{C}$, we prove that a modified trace on the tensor ideal of projective objects can be obtained from a suitable trivialization of the Nakayama functor as right $\mathcal{C}$-module functor. Using a result of Costello, this allows us to associate to any finite tensor category equipped with such a trivialization of the Nakayama functor a chain complex valued topological conformal field theory, the trace field theory. The trace field theory topologically describes the modified trace, the Hattori-Stallings trace, and also the structures induced by them on the Hochschild complex of $\mathcal{C}$. In this article, we focus on implications in the linear (as opposed to differential graded) setting: We use the trace field theory to define a non-unital homotopy commutative product on the Hochschild chains in degree zero. This product is block diagonal and can be described through the handle elements of the trace field theory. Taking the modified trace of the handle elements recovers the Cartan matrix of $\mathcal{C}$.

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