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Categorification of quantum symmetric pairs I

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arxiv 1605.03780 v3 pith:WUHFJSCX submitted 2016-05-12 math.RT math.CTmath.QA

Categorification of quantum symmetric pairs I

classification math.RT math.CTmath.QA
keywords algebracategorifycategorycoidealquantumactionallowsbasis
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We categorify a coideal subalgebra of the quantum group of $\mathfrak{sl}_{2r+1}$ by introducing a $2$-category \`a la Khovanov-Lauda-Rouquier, and show that self-dual indecomposable $1$-morphisms categorify the canonical basis of this algebra. This allows us to define a categorical action of this coideal algebra on the categories of modules over cohomology rings of partial flag varieties and on the BGG category $\mathcal{O}$ of type B/C.

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