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arXiv 1702.04015math.AG
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三次四重Dg范畴

Dg categories of cubic fourfolds

Martino Cantadore

摘要:

我们证明了一个重构定理à la Calabrese-Groechenig的模空间参数化摩天大楼层在一个光滑的射影簇,当这些被认为是一个系统的点在dg范畴的完美复形的品种,公理化的Toën和Vaquié。这个结果然后被用来表明,对于一个三次四重$Y\subset \mathbb{P}^5_\mathbb{C}$,Kuznetsov范畴$\mathcal{A}_Y$是几何的(可能扭曲的)当且仅当一个dg增强$T_Y$的$\mathcal{A}_Y$允许一个点系统,其相关的模空间是一个(可能扭曲的)K3表面。

英文摘要:

We prove a reconstruction theorem à la Calabrese-Groechenig for the moduli space parametrizing skyscraper sheaves on a smooth projective variety when these are considered as a system of points in the dg category of perfect complexes on the variety, as axiomatized by Toën and Vaquié. This result is then used to show that, for a cubic fourfold $Y\subset \mathbb{P}^5_\mathbb{C}$, the Kuznetsov category $\mathcal{A}_Y$ is geometric (possibly twisted) if and only if a dg enhancement $T_Y$ of $\mathcal{A}_Y$ admits a system of points whose associated moduli space is a (possibly twisted) K3 surface.

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