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arXiv 0912.3572math.AG
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由真态射平凡化的向量丛与基本群方案

Vector bundles trivialized by proper morphisms and the fundamental group scheme

Indranil Biswas, Joao Pedro P. dos Santos

摘要:

设X是定义在代数闭域k上的光滑射影簇。Nori在X上构造了一个向量丛范畴,称为本质有限向量丛,这让人想起基本群(特征为零)的表示范畴。事实上,这个范畴等价于控制所有有限扭子的亲有限群概型的表示范畴。我们证明了本质有限的向量丛与那些在被某些真满射拉回到X之后变得平凡的向量丛是一致的。

英文摘要:

Let X be a smooth projective variety defined over an algebraically closed field k. Nori constructed a category of vector bundles on X, called essentially finite vector bundles, which is reminiscent of the category of representations of the fundamental group (in characteristic zero). In fact, this category is equivalent to the category of representations of a pro--finite group scheme which controls all finite torsors. We show that essentially finite vector bundles coincide with those which become trivial after being pulled back by some proper and surjective morphism to X.

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