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arXiv 2602.08264math.RTmath.AG
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根为单位根时的Gaiotto范畴中的不可约对象

Irreducible objects in the Gaiotto category at roots of unity

University of Toronto(多伦多大学)

Aleksandr Popkovich

AI总结:

研究探讨在q为单位根时,Gaiotto范畴与超群表示范畴的等价性,通过不可约对象的双射证明

摘要:

R.Travkin和R.Yang提出的一个定理指出,对于一般的q(非单位根),在GL_N的仿射Grassmannian上,q-扭曲的D-模在某个子群(由0≤M<N的选择定义)下equivariant的范畴等价于量子超群U_q(gl(M|N))的表示范畴。我们旨在探讨当q为单位根时这种等价是否成立。我们首先询问是否存在自然的不可约对象集合之间的双射。在本笔记中,我们观察到一个暗示应成立的观察:我们展示了Gaiotto范畴中的不可约对象与超群GL(M|N)在正特征下的表示范畴中的不可约对象之间存在自然的双射。证明基于J.Brundan和J.Kujawa在arXiv:math/0210108中提出的Serganova算法版本。

英文摘要:

A theorem of R. Travkin and R. Yang, initially conjectured by D. Gaiotto, states that for a generic (not a root of unity) $q$ the category of $q$-twisted D-modules on the affine Grassmannian $Gr_{GL_N}$ which are equivariant with respect to a certain subgroup (defined by a choice of $0 \le M <N$) of $GL_N$ is equivalent to the category of representations of the quantum supergroup $U_q(\mathfrak{gl}(M|N))$. We aim to see whether this equivalence should hold when $q$ is a root of unity. We begin by asking if there is a natural bijection between the sets of irreducible objects. In this note we make an observation that suggests this should be the case: we show that there is a natural bijection between irreducible objects in the Gaiotto category and in the category of representations of a supergroup $GL(M|N)$ in positive characteristic. The proof is based on the version of the Serganova's algorithm formulated by J. Brundan and J. Kujawa in arXiv:math/0210108.

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