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arXiv 0907.3539math.AG
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中间代数Jacobian上的投影

Projectors on the intermediate algebraic Jacobians

Charles Vial

摘要:

设$X$是维数为$d$的复光滑射影簇.在对$X$的上同调作一定假设的情况下,构造了$CH_d(X \times X) \otimes \Q$中相互正交的幂等元,它们对代数平凡圈的作用与Abel-Jacobi映射一致.这样的建设推广Murre的建设的Albanese和Picard幂等元,并使人们有可能给新的例子品种承认自对偶Chow-Künneth分解满足motivic Lefschetz猜想以及新的例子品种有木村有限维Chow动机。例如,我们证明了支持在曲线上的零圈的Chow群的四重(例如有理连通四重)具有自对偶Chow-Künneth分解,该分解满足motivic Lefschetz猜想,从而满足Grothendieck的标准分解。我们还证明了非常低次的超曲面是Kimura有限维的。

英文摘要:

Let $X$ be a complex smooth projective variety of dimension $d$. Under some assumption on the cohomology of $X$, we construct mutually orthogonal idempotents in $CH_d(X \times X) \otimes \Q$ whose action on algebraically trivial cycles coincides with the Abel-Jacobi map. Such a construction generalizes Murre's construction of the Albanese and Picard idempotents and makes it possible to give new examples of varieties admitting a self-dual Chow-Künneth decomposition satisfying the motivic Lefschetz conjecture as well as new examples of varieties having a Kimura finite dimensional Chow motive. For instance, we prove that fourfolds with Chow group of zero-cycles supported on a curve (e.g. rationally connected fourfolds) have a self-dual Chow-Künneth decomposition which satisfies the motivic Lefschetz conjecture and consequently Grothendieck's standard conjectures. We also prove that hypersurfaces of very low degree are Kimura finite dimensional.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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