On the derived category of 1-motives, I

On the derived category of 1-motives, I
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在 1-动机的派生范畴上,我

DOI:
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发表时间:
2007
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通讯作者:
B. Kahn
B. Kahn
中科院分区:
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文献类型:
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作者:
L. Barbieri;B. Kahn

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我们考虑了指数特征p的完美域k上的Deligne 1-动机的范畴及其在p反转后的合适精确结构的派生范畴。作为第一个结果,我们提供了一个完全忠实的嵌入到Voevodsky的几何动机三角化范畴的一个真实版本中。我们的第二个主要结果是,这个完整的嵌入“几乎”有一个左伴随,我们称之为\LAlb。应用于一个变量的动机,我们得到了一个1动机的有界复,我们对光滑变量完全计算,对奇异变量部分计算。作为一个应用,我们给出了Roitman型定理(特征0)的动机证明。
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).