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arXiv 2604.20005math.AGmath.AC
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$F$-有限方案具有对偶复形

$F$-finite schemes have a dualizing complex

Bhargav Bhatt, Manuel Blickle, Karl Schwede, Kevin Tucker

AI总结:

本文证明了任何Noetherian $F$-有限方案都有一个对偶复形,使得所有有限类型映射的对偶性映射自然同构,从而为Frobenius映射提供自然同构。

摘要:

本文证明了任何Noetherian $F$-有限方案都有一个对偶复形 $ω^{\bullet}_{X}$,使得对于所有有限类型映射 $f \colon X \to Y$ 之间 $F$-有限Noetherian方案,存在自然同构 $ω^{\bullet}_{X} \xrightarrow{\cong} f^!ω^{\bullet}_{Y}$ 在 $D^b_{coh}(X)$ 中。为此,我们依赖Gabber的结果,即每个Noetherian $F$-有限环都是正则环的商,从而得出每个$F$-有限Noetherian方案有(可能非自然的)对偶复形。为了使其自然,我们识别任何$F$-有限Noetherian方案的对偶复形作为$D^b_{coh}(X)$上另一种对称单oidal结构的单位,称为$!$-张量积。我们还简要描述了通过更经典的Grothendieck对偶方法寻找此自然对偶复形的替代方法。

英文摘要:

In this paper we show that any Noetherian $F$-finite scheme has a dualizing complex $ω^{\bullet}_{X}$ with the property that for all finite type maps $f \colon X \to Y$ between $F$-finite Noetherian schemes there is a canonical isomorphism $ω^{\bullet}_{X} \xrightarrow{\cong} f^!ω^{\bullet}_{Y}$ in $D^b_{coh}(X)$. This, in particular, applies to the Frobenius morphism $F \colon X \to X$ so that we obtain a canonical isomorphism $ω^{\bullet}_{X} \xrightarrow{\cong} F^!ω^{\bullet}_{X}$. To prove this, we rely on a result of Gabber that every Noetherian $F$-finite ring is a quotient of a regular ring, from which it follows that every $F$-finite Noetherian scheme has a (potentially non-canonical) dualizing complex. To make this canonical, we identify the dualizing complex of any $F$-finite Noetherian scheme as a unit of an alternate symmetric monoidal structure on $D^b_{coh}(X)$ we call the $!$-tensor product. We also sketch an alternate approach to finding this canonical dualizing complex following the more classical approach to Grothendieck duality.

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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