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Quantum K-theoretic geometric Satake: the $\operatorname{SL}_{n}$ case

Part of: Linear algebraic groups and related topics

Published online by Cambridge University Press:  30 October 2017

Sabin Cautis  and
Joel Kamnitzer
Sabin Cautis
Affiliation:
Department of Mathematics, University of British Columbia, Vancouver BC, Canada email cautis@math.ubc.ca
Joel Kamnitzer
Affiliation:
Department of Mathematics, University of Toronto, Toronto ON, Canada email jkamnitz@math.utoronto.ca
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Abstract

The geometric Satake correspondence gives an equivalence of categories between the representations of a semisimple group $G$ and the spherical perverse sheaves on the affine Grassmannian $Gr$ of its Langlands dual group. Bezrukavnikov and Finkelberg developed a derived version of this equivalence which relates the derived category of $G^{\vee }$-equivariant constructible sheaves on $Gr$ with the category of $G$-equivariant ${\mathcal{O}}(\mathfrak{g})$-modules. In this paper, we develop a K-theoretic version of the derived geometric Satake which involves the quantum group $U_{q}\mathfrak{g}$. We define a convolution category $K\operatorname{Conv}(Gr)$ whose morphism spaces are given by the $G^{\vee }\times \mathbb{C}^{\times }$-equivariant algebraic K-theory of certain fibre products. We conjecture that $K\operatorname{Conv}(Gr)$ is equivalent to a full subcategory of the category of $U_{q}\mathfrak{g}$-equivariant ${\mathcal{O}}_{q}(G)$-modules. We prove this conjecture when $G=\operatorname{SL}_{n}$. A key tool in our proof is the $\operatorname{SL}_{n}$ spider, which is a combinatorial description of the category of $U_{q}\mathfrak{sl}_{n}$ representations. By applying horizontal trace, we show that the annular $\operatorname{SL}_{n}$ spider describes the category of $U_{q}\mathfrak{sl}_{n}$-equivariant ${\mathcal{O}}_{q}(\operatorname{SL}_{n})$-modules. Then we use quantum loop algebras to relate the annular $\operatorname{SL}_{n}$ spider to $K\operatorname{Conv}(Gr)$. This gives a combinatorial/diagrammatic description of both categories and proves our conjecture.

Keywords

geometric Satake correspondencequantum groupsaffine spiderswebscategorification

MSC classification

Primary: 20G42: Quantum groups (quantized function algebras) and their representations
Type
Research Article
Information
Compositio Mathematica , Volume 154 , Issue 2 , February 2018 , pp. 275 - 327
Copyright
© The Authors 2017 

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