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arXiv 2008.13149math.RT
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素特征对称张量范畴的上同调

On cohomology in symmetric tensor categories in prime characteristic

David Benson, Pavel Etingof

摘要:

描述了特征$p$域上的分次交换Gorenstein代数${\mathcal E}_n(p)$,并猜想$\mathrm{Ext}^\bullet_{\mathsf{Ver}_{p^{n+1}}}(1,1)\cong{\mathcal E}_{n}(p)$,其中$\mathsf{Ver}_{p^{n+1}}$是最近在\cite{Benson/Etingof:2019a,Benson/Etingof/Ostrik,Coulembier}中构造的新的对称张量范畴.我们调查这些代数的组合,与Minc的配分函数的关系,以及可能的行动的Steenrod操作对他们。该猜想的证据包括对$n$小值的大量计算。我们还提供了一些理论证据。也就是说,我们使用Koszul构造来识别${\mathcal E}_n(p)$中的齐次参数系统与$\mathrm{Ext}^\bullet_{\mathsf{Ver}_{p^{n+1}}}(1,1)$中的齐次参数系统。对于$1\le i \le n$,如果$p=2$为奇数,则这些参数具有度$2^i-1$,如果$p$为奇数,则这些参数具有度$2(p^i-1)$。这至少说明了$\mathrm{Ext}^\bullet_{\mathsf{Ver}_{p^{n+1}}}(1,1)$是一个与${\mathcal E}_n(p)$具有相同Krull维数的分次交换代数.对于$p=2$,我们还表明,$\mathrm{Ext}^\bullet_{\mathsf{Ver}_{2^{n+1}}}(1,1)$具有预期的秩$2^{n(n-1)/2}$作为一个模块的子代数的参数。

英文摘要:

We describe graded commutative Gorenstein algebras ${\mathcal E}_n(p)$ over a field of characteristic $p$, and we conjecture that $\mathrm{Ext}^\bullet_{\mathsf{Ver}_{p^{n+1}}}(1,1)\cong{\mathcal E}_{n}(p)$, where $\mathsf{Ver}_{p^{n+1}}$ are the new symmetric tensor categories recently constructed in \cite{Benson/Etingof:2019a,Benson/Etingof/Ostrik,Coulembier}. We investigate the combinatorics of these algebras, and the relationship with Minc's partition function, as well as possible actions of the Steenrod operations on them. Evidence for the conjecture includes a large number of computations for small values of $n$. We also provide some theoretical evidence. Namely, we use a Koszul construction to identify a homogeneous system of parameters in ${\mathcal E}_n(p)$ with a homogeneous system of parameters in $\mathrm{Ext}^\bullet_{\mathsf{Ver}_{p^{n+1}}}(1,1)$. These parameters have degrees $2^i-1$ if $p=2$ and $2(p^i-1)$ if $p$ is odd, for $1\le i \le n$. This at least shows that $\mathrm{Ext}^\bullet_{\mathsf{Ver}_{p^{n+1}}}(1,1)$ is a finitely generated graded commutative algebra with the same Krull dimension as ${\mathcal E}_n(p)$. For $p=2$ we also show that $\mathrm{Ext}^\bullet_{\mathsf{Ver}_{2^{n+1}}}(1,1)$ has the expected rank $2^{n(n-1)/2}$ as a module over the subalgebra of parameters.

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