范畴对称豪对偶的三个视角

Categorical geometric symmetric Howe duality

We provide a natural geometric setting for symmetric Howe duality. This is realized as a (loop) sl(n) action on derived categories of coherent sheaves on certain varieties arising in the geometry of the Beilinson-Drinfeld Grassmannian. The main construction parallels our earlier work on categorical sl(n) actions and skew Howe duality. In that case the varieties involved arose in the geometry of the affine Grassmannian. We discuss some relationships between the two actions.

范畴循环同调与栈上过滤 $\mathcal{D}$-模：Koszul 对偶

Categorical cyclic homology and filtered $\mathcal{D}$-modules on stacks: Koszul duality

本文证明光滑栈上过滤 $\mathcal{D}$-模与其形式环路空间上的 $S^1$-等变 ind-coherent 层之间存在 Koszul 对偶等价，并描述其特殊纤维与一般纤维。

拟分裂实群的Koszul对偶

Koszul Duality for Quasi-split Real Groups

该研究构建了拟分裂实群的范畴化Vogan对偶，证明了Soergel猜想在拟分裂情形下的正确性。

The $\mathfrak{sl}_n$ foam 2-category: a combinatorial formulation of Khovanov-Rozansky homology via categorical skew Howe duality

We give a purely combinatorial construction of colored $\mathfrak{sl}_n$ link homology. The invariant takes values in a 2-category where 2-morphisms are given by foams, singular cobordisms between $\mathfrak{sl}_n$ webs; applying a (TQFT-like) representable functor recovers (colored) Khovanov-Rozansky homology. Novel features of the theory include the introduction of `enhanced' foam facets which fix sign issues associated with the original matrix factorization formulation and the use of skew Howe duality to show that (enhanced) closed foams can be evaluated in a completely combinatorial manner…

Categorical representations, KLR algebras and Koszul duality

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 components of the functor $F$ for the categor…

A categorical approach to classical and quantum Schur-Weyl duality

We use category theory to propose a unified approach to the Schur-Weyl dualities involving the general linear Lie algebras, their polynomial extensions and associated quantum deformations. We define multiplicative sequences of algebras exemplified by the sequence of group algebras of the symmetric groups and use them to introduce associated monoidal categories. Universal properties of these categories lead to uniform constructions of the Drinfeld functor connecting representation theories of the degenerate affine Hecke algebras and the Yangians and of its q-analogue. Moreover, we construct act…