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arXiv 2106.01464math.AGmath.KT
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motivic范畴上的光滑权结构和双理性过滤

Smooth weight structures and birationality filtrations on motivic categories

Mikhail V. Bondarko, David Z. Kumallagov

摘要:

我们研究各种三角形motivic类别,并介绍了一个庞大的家庭的过道(这些是某些类别的对象)。这些过道定义在相应的“动机”(或motivic频谱)的光滑品种,在他们,我们将它们与相应的同伦t-结构。我们描述了我们的通道在函数场的茎,并证明了他们广泛推广对应的切片过滤。此外,由这些通道诱导的相应有效子范畴的“同伦心”$Ht_{hom}^{eff}$上的过滤可以用(Nisnevich)层上同调以及Voevodsky收缩$-_{-1}$来描述。分别地,我们表示$Ht_{hom}^{eff}$的对象是弱双有理的条件(即,它的$n+1$ th收缩是平凡的,或者等价地,对于某些$n\ge 0$,Nisnevich上同调在$>n$度中为零);这一陈述推广了Kahn和Sujatha的著名结果。接下来,这些类定义权重结构$w_{Smooth}^{s}$(其中$s=(s_{j})$是参数化通道的非减序列),其极大地概括了之前定义的Chow权重结构$w_{Chow}$。利用一般的抽象无意义构造了相应的邻接$t-$结构$t_{Smooth}^{s}$,并证明了它们给出了$Ht^{eff}_{hom}$上的双合理性滤子.此外,这些权重结构中的一些在相应的$n-$双有理动机类别上诱导权重结构(这些是切片过滤水平的局部化)。我们的结果也产生了一些新的非分歧上同调计算。

英文摘要:

We study various triangulated motivic categories and introduce a vast family of aisles (these are certain classes of objects) in them. These aisles are defined in terms of the corresponding "motives" (or motivic spectra) of smooth varieties in them; we relate them to the corresponding homotopy t-structures. We describe our aisles in terms of stalks at function fields and prove that they widely generalize the ones corresponding to slice filtrations. Further, the filtrations on the "homotopy hearts" $Ht_{hom}^{eff}$ of the corresponding effective subcategories that are induced by these aisles can be described in terms of (Nisnevich) sheaf cohomology as well as in terms of the Voevodsky contractions $-_{-1}$. Respectively, we express the condition for an object of $Ht_{hom}^{eff}$ to be weakly birational (i.e., that its $n+1$th contraction is trivial or, equivalently, the Nisnevich cohomology vanishes in degrees $>n$ for some $n\ge 0$) in terms of these aisles; this statement generalizes well-known results of Kahn and Sujatha. Next, these classes define weight structures $w_{Smooth}^{s}$ (where $s=(s_{j})$ are non-decreasing sequences parameterizing our aisles) that vastly generalize the Chow weight structures $w_{Chow}$ defined earlier. Using general abstract nonsense we also construct the corresponding adjacent $t-$structures $t_{Smooth}^{s}$ and prove that they give the birationality filtrations on $Ht^{eff}_{hom}$. Moreover, some of these weight structures induce weight structures on the corresponding $n-$birational motivic categories (these are the localizations by the levels of the slice filtrations). Our results also yield some new unramified cohomology calculations.

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