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arXiv 2009.07477math.RT
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约化泛包络代数的块子代数上的滤子

Filtrations on block subalgebras of reduced universal enveloping algebras

Andrei Ionov, Dylan Pentland

摘要:

研究了正特征约化泛包络代数的块分解、PBW滤子和幂零锥之间的相互作用。我们提供了两个自然版本的PBW过滤块子代数$A_λ$的限制泛包络代数$\mathcal{U}_χ(\mathfrak{g})$,并显示这些是对偶的对方。我们还考虑了转移PBW过滤,我们相关的分次代数的Frobenius邻域的$0$在幂零锥和共不变代数对应的$λ$的功能的代数。在特征$p>2$中的$\mathfrak{g}=\mathfrak{sl}_2(k)$的情况下,我们确定了这些滤子在$\mathcal{U}_0(\mathfrak{sl}_2)$的块子代数上的相关分次代数.我们也将此应用于确定$\mathcal{U}_0(\mathfrak{sl}_2)$的伴随表示的结构。

英文摘要:

We study the interaction between the block decompositions of reduced universal enveloping algebras in positive characteristic, the PBW filtration, and the nilpotent cone. We provide two natural versions of the PBW filtration on the block subalgebra $A_λ$ of the restricted universal enveloping algebra $\mathcal{U}_χ(\mathfrak{g})$ and show these are dual to each other. We also consider a shifted PBW filtration for which we relate the associated graded algebra to the algebra of functions on the Frobenius neighbourhood of $0$ in the nilpotent cone and the coinvariants algebra corresponding to $λ$. In the case of $\mathfrak{g}=\mathfrak{sl}_2(k)$ in characteristic $p>2$ we determine the associated graded algebras of these filtrations on block subalgebras of $\mathcal{U}_0(\mathfrak{sl}_2)$. We also apply this to determine the structure of the adjoint representation of $\mathcal{U}_0(\mathfrak{sl}_2)$.

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