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arXiv 1003.1267math.AG
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数环上的混合Artin-Tate动机

Mixed Artin-Tate motives over number rings

Jakob Scholbach

摘要:

本文研究数环上的Artin-Tate动机。作为几何基模的一个子范畴,Artin-Tate基模的三角范畴DATM(S)是由基S上有限的基模生成的。在建立了这些子范畴在开浸入和闭浸入的拉回和推进下的稳定性之后,我们构造了一个动机t-结构。这些函子熟悉的反常层的准确性属性,在这种情况下举行。混合Artin-Tate动机的上同调维数为2,并且Artin-Tate动机的三角范畴与混合Artin-Tate动机的导出范畴等价.更新第二个版本:一个函子和严格的权重过滤混合阿廷-泰特动机的建立。此外,两个小的修正已经完成:第一,范畴的Artin-Tate动机现在被定义为三角形的范畴所产生的直接因素的$f_* \mathbf 1(n)$ -而不是厚的范畴所产生的这些发电机。其次,仅对标准映射$f$证明了有限映射的$f^*$的正确性.

英文摘要:

This paper studies Artin-Tate motives over number rings. As a subcategory of geometric motives, the triangulated category of Artin-Tate motives DATM(S) is generated by motives of schemes that are finite over the base S. After establishing stability of these subcategories under pullback and pushforward along open and closed immersions, a motivic t-structure is constructed. Exactness properties of these functors familiar from perverse sheaves are shown to hold in this context. The cohomological dimension of mixed Artin-Tate motives is two, and there is an equivalence of the triangulated category of Artin-Tate motives with the derived category of mixed Artin-Tate motives. Update in second version: a functorial and strict weight filtration for mixed Artin-Tate motives is established. Moreover, two minor corrections have been performed: first, the category of Artin-Tate motives is now defined to be the triangulated category generated by direct factors of $f_* \mathbf 1(n)$---as opposed to the thick category generated by these generators. Secondly, the exactness of $f^*$ for a finite map is only stated for etale maps $f$.

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