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arXiv 1909.11151math.RTmath.KT
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K-动机与Koszul对偶

K-Motives and Koszul Duality

Jens Niklas Eberhardt

摘要:

受Beilinson在$K$ -理论中构造有理动机上同调的启发,我们构造了Langlands对偶旗簇的Beilinson-Ginzburg-Soergel的Koszul对偶的一个未分次版本.为此,我们引入并研究了具有仿射分层$\mathcal{S}$的$X$簇上的$\mathcal{S}$ -可构造$K$ -motivic层的范畴$\operatorname{DK}_{\mathcal{S}}(X)$.我们发现,有一个自然的和几何的函子,称为贝林森实现,从$\mathcal{S}$ -可构造的混合层$\operatorname{D}^{mix}_{\mathcal{S}}(X)$到$\operatorname{DK}_{\mathcal{S}}(X)$。然后,我们表明,Koszul对偶交织的贝蒂实现和贝林森实现函子和下降到一个等价的构造层和构造$K$ motivic层的朗兰兹双旗品种。

英文摘要:

We construct an ungraded version of Beilinson-Ginzburg-Soergel's Koszul duality for Langlands dual flag varieties, inspired by Beilinson's construction of rational motivic cohomology in terms of $K$-theory. For this, we introduce and study categories $\operatorname{DK}_{\mathcal{S}}(X)$ of $\mathcal{S}$-constructible $K$-motivic sheaves on varieties $X$ with an affine stratification $\mathcal{S}$. We show that there is a natural and geometric functor, called Beilinson realisation, from $\mathcal{S}$-constructible mixed sheaves $\operatorname{D}^{mix}_{\mathcal{S}}(X)$ to $\operatorname{DK}_{\mathcal{S}}(X)$. We then show that Koszul duality intertwines the Betti realisation and Beilinson realisation functors and descends to an equivalence of constructible sheaves and constructible $K$-motivic sheaves on Langlands dual flag varieties.

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