Annihilators of $D$-modules in mixed characteristic

IF 0.6 3区 数学 Q3 MATHEMATICS Mathematical Research Letters Pub Date : 2023-12-15 DOI:10.4310/mrl.2023.v30.n3.a5
Rankeya Datta, Nicholas Switala, Wenliang Zhang
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引用次数: 0

Abstract

Let $R$ be a polynomial or formal power series ring with coefficients in a DVR $V$ of mixed characteristic with a uniformizer $\pi$. We prove that the $R$-module annihilator of any nonzero $\mathcal{D}(R,V)$-module is either zero or is generated by a power of $\pi$. In contrast to the equicharacteristic case, nonzero annihilators can occur; we give an example of a top local cohomology module of the ring $\mathbb{Z}_2 [[x_0, \dotsc, x_5]]$ that is annihilated by $2$, thereby answering a question of Hochster in the negative. The same example also provides a counterexample to a conjecture of Lyubeznik and Yildirim.
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混合特征中 $D$ 模块的湮没器
让 $R$ 是一个多项式或形式幂级数环,其系数在具有均匀化 $\pi$ 的混合特征 DVR $V$ 中。我们证明,任何非零 $\mathcal{D}(R,V)$模块的 $R$ 模块湮没器要么为零,要么由 $\pi$ 的幂生成。我们举了一个例子,说明环 $\mathbb{Z}_2 [[x_0, \dotsc, x_5]]$ 的顶局部同调模块被 2$ 所湮没,从而从反面回答了霍赫斯特的一个问题。同样的例子也为柳贝兹尼克和耶尔德里姆的猜想提供了一个反例。
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来源期刊
CiteScore
1.40
自引率
0.00%
发文量
9
审稿时长
6.0 months
期刊介绍: Dedicated to publication of complete and important papers of original research in all areas of mathematics. Expository papers and research announcements of exceptional interest are also occasionally published. High standards are applied in evaluating submissions; the entire editorial board must approve the acceptance of any paper.
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