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arXiv 2408.06233math.AG
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一般动机与域的动机上同调

Generic motives and motivic cohomology of fields

F. Déglise

AI总结:

本文研究generic motives的结构及其对域动机上同调的影响,给出曲线和曲面的新计算并提出态射猜想框架,同时直接确定数域K-理论$λ$-结构的权,证明许多动机上同调群具有无限秩且不可数,并提出补充Beilinson-Soulé消失猜想的增长可控性猜想。

摘要:

本文研究了generic motives的结构及其对域的动机上同调的影响。generic motives源于Voevodsky的动机理论,并与Beilinson关于动机$t$-结构的构想相关,它们作为pro-objects编码了关于循环和上同调的重要信息。我们给出了generic motives的新计算,重点关注曲线和曲面。这些计算提示了一个关于generic motives态射的猜想性框架,并凸显了超越动机的核心作用。随后,我们聚焦于域的动机上同调,以Borel对K-理论的秩计算及其与higher regulators的关系为基础。我们提供了一个直接论证来确定数域K-理论的$λ$-结构中权,从而绕过了对regulator maps的需要。我们证明动机上同调群常常具有无限秩,通常与基域的基数相匹配。例如,我们证明了$\mathbb R$和$\mathbb C$的动机上同调群在许多双次数上都是不可数的。尽管如此,我们提出了一个补充Beilinson-Soulé消失猜想的猜想,表明动机上同调的增长比这些结果最初可能显示的更为可控。

英文摘要:

This paper investigates the structure of generic motives and their implications for the motivic cohomology of fields. Originating in Voevodsky's theory of motives and related to Beilinson's vision of a motivic $t$-structure, generic motives serve as pro-objects encoding essential information about cycles and cohomology. We present new computations of generic motives, focusing on curves and surfaces. These computations suggest a conjectural framework for morphisms of generic motives and highlight the central role of transcendental motives. We then focus on the motivic cohomology of fields, building on Borel's rank computation of K-theory and its relation to higher regulators. We provide a direct argument for determining the weights in the $λ$-structure of the K-theory of number fields, bypassing the need for regulator maps. We show that motivic cohomology groups are often of infinite rank, typically matching the cardinality of the base field. For instance, we prove that motivic cohomology groups of $\mathbb R$ and $\mathbb C$ are uncountable in many bi-degrees. Despite this, we propose a conjecture that complements the Beilinson-Soulé vanishing conjecture, suggesting that the growth of motivic cohomology is more controlled than these results may initially indicate.

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