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arXiv 0705.1076math.QA
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非对易环面与Riemann-Hilbert对应

Noncommutative tori and the Riemann-Hilbert correspondence

Snigdhayan Mahanta, Walter D. van Suijlekom

摘要:

通过一类$\mathbb{C}^*$上的等变微分模研究了非交换环面与非交换椭圆曲线之间的相互作用。我们泛函地将这个范畴与Polishchuk和Schwarz所引入的非对易环面上的全纯向量丛范畴联系起来,并研究了相应的K-理论之间的诱导映射。另外,Soibelman和Vologodsky的非交换椭圆曲线范畴也有一个遗忘函子,$\mathbb{C}^*$上具有正则奇异联络的向量丛范畴也有一个遗忘函子.我们考虑的范畴具有Tannakian范畴的良好性质,因此它等价于仿射群方案的表示范畴。通过黎曼-希尔伯特对应的等变形式,我们确定这个群概型是$\mathbb{Z}^2$(的代数壳)。我们还得到了非对易环面的全纯丛范畴的一个满子范畴,它等价于$\mathbb{Z}$的表示范畴.这个群体是建议的拓扑基本群的非交换环面(理解为退化的椭圆曲线),我们研究诺里的概念的étale基本群在这方面。

英文摘要:

We study the interplay between noncommutative tori and noncommutative elliptic curves through a category of equivariant differential modules on $\mathbb{C}^*$. We functorially relate this category to the category of holomorphic vector bundles on noncommutative tori as introduced by Polishchuk and Schwarz and study the induced map between the corresponding K-theories. In addition, there is a forgetful functor to the category of noncommutative elliptic curves of Soibelman and Vologodsky, as well as a forgetful functor to the category of vector bundles on $\mathbb{C}^*$ with regular singular connections. The category that we consider has the nice property of being a Tannakian category, hence it is equivalent to the category of representations of an affine group scheme. Via an equivariant version of the Riemann-Hilbert correspondence we determine this group scheme to be (the algebraic hull of) $\mathbb{Z}^2$. We also obtain a full subcategory of the category of holomorphic bundles of the noncommutative torus, which is equivalent to the category of representations of $\mathbb{Z}$. This group is the proposed topological fundamental group of the noncommutative torus (understood as a degenerate elliptic curve) and we study Nori's notion of étale fundamental group in this context.

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