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arXiv 1506.07375math.KTmath.AGmath.AT
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论函子对动机谱的保守性及其动机

On the Conservativity of the Functor Assigning to a Motivic Spectrum its Motive

Tom Bachmann

摘要:

给定一个完满域k上的0-连通动机谱$E \in SH(k)$,我们用$π_0 (E)$确定了相关动机$M E \in DM(k)$的$h_0$.利用这一点,我们证明了,如果k具有有限的2-tale上同调维数,那么函子M在紧谱的子范畴内是保守的,并诱导了Picard群上的一个注入。我们通过考虑我们所谓的“真实动机”,将保守性结果推广到有限虚2-tale上同调维数的领域。作为一个副产品,我们reprove一个变种的刚性定理的Röndings-Eustvær。

英文摘要:

Given a 0-connective motivic spectrum $E \in SH(k)$ over a perfect field k, we determine $h_0$ of the associated motive $M E \in DM(k)$ in terms of $π_0 (E)$. Using this we show that if k has finite 2-étale cohomological dimension, then the functor M is conservative when restricted to the subcategory of compact spectra, and induces an injection on Picard groups. We extend the conservativity result to fields of finite virtual 2-étale cohomological dimension by considering what we call "real motives". As a by-product we reprove a variant of a rigidity Theorem of Röndings-Østvær.

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