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arXiv math/0511123math.QA
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关于来自有限群的张量范畴的指数

On the exponent of tensor categories coming from finite groups

Sonia Natale

摘要:

我们用群上同调描述了与有限群$G$相关的群论融合范畴$\mathcal C = \mathcal C(G, ω, F, α)$的指数。我们证明了$\C$的指数可以整除$e(ω) \exp G$和$(\exp G)^2$,其中$e(ω)$是3-上循环$ω$的上同调序.特别地,$\exp \C$分裂$(\dim \C)^2$。

英文摘要:

We describe the exponent of a group-theoretical fusion category $\mathcal C = \mathcal C(G, ω, F, α)$ associated to a finite group $G$ in terms of group cohomology. We show that the exponent of $\C$ divides both $e(ω) \exp G$ and $(\exp G)^2$, where $e(ω)$ is the cohomological order of the 3-cocycle $ω$. In particular $\exp \C$ divides $(\dim \C)^2$.

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