Vector bundles trivialized by proper morphisms and the fundamental group scheme

Details Vector bundles trivialized by proper morphisms and the fundamental group scheme Vector bundles trivialized by proper morphisms and the fundamental group scheme

2009-12-18

arxiv.org/abs/0912.3572v1

Mathematics

Algebraic Geometry

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Scientific paper

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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