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arXiv · 0706.1498

On the derived category of 1-motives, I

Luca Barbieri-Viale·Bruno Kahn
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Abstract

We consider the category of Deligne 1-motives over a perfect field k of exponential characteristic p and its derived category for a suitable exact structure after inverting p. As a first result, we provide a fully faithful embedding into an etale version of Voevodsky's triangulated category of geometric motives. Our second main result is that this full embedding "almost" has a left adjoint, that we call \LAlb. Applied to the motive of a variety we thus get a bounded complex of 1-motives, that we compute fully for smooth varieties and partly for singular varieties. As an application we give motivic proofs of Roitman type theorems (in characteristic 0).

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Luca Barbieri-Viale, Bruno Kahn. 2007-06-11. On the derived category of 1-motives, I. https://arxiv.org/abs/0706.1498

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