arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2007.11267math.RT
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仿射范畴O,Koszul对偶与Zuckerman函子

Affine category O, Koszul duality and Zuckerman functors

Ruslan Maksimau

摘要:

仿射${\mathfrak{gl}}_N$在$-N-e$层上的抛物范畴$\mathcal{O}$允许$\widetilde{\mathfrak{sl}}_e$关于某些内函子$E$和$F$的范畴表示的结构。这个范畴包含一个较小的范畴$\mathbf{A}$,它对更高级别的Fock空间进行分类。证明了范畴$\mathbf{A}$中的函子$E$和$F$是Zuckerman函子的Koszul对偶.证明的关键是证明了范畴$\mathbf{A}$在$-N-e$层上的函子$F$可以分解为范畴$\mathbf{A}$在$-N-e-1$层上的函子$F$的分量。为了证明这一点,我们使用以下事实:一个具有$\widetilde{\mathfrak sl}_{e+1}$作用的范畴包含一个具有$\widetilde{\mathfrak sl}_{e}$作用的(规范定义的)子范畴。我们还证明了一个一般的声明,说,在某些一般情况下,函子,满足一系列的公理是自动Koszul对偶某种朱克曼函子。

英文摘要:

The parabolic category $\mathcal{O}$ for affine ${\mathfrak{gl}}_N$ at level $-N-e$ admits a structure of a categorical representation of $\widetilde{\mathfrak{sl}}_e$ with respect to some endofunctors $E$ and $F$. This category contains a smaller category $\mathbf{A}$ that categorifies the higher level Fock space. We prove that the functors $E$ and $F$ in the category $\mathbf{A}$ are Koszul dual to Zuckerman functors. The key point of the proof is to show that the functor $F$ for the category $\mathbf{A}$ at level $-N-e$ can be decomposed in terms of the components of the functor $F$ for the category $\mathbf{A}$ at level $-N-e-1$. To prove this, we use the following fact: a category with an action of $\widetilde{\mathfrak sl}_{e+1}$ contains a (canonically defined) subcategory with an action of $\widetilde{\mathfrak sl}_{e}$. We also prove a general statement that says that in some general situation a functor that satisfies a list of axioms is automatically Koszul dual to some sort of Zuckerman functor.

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