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arXiv 2406.07307math.AG
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Calabi-Yau对的有效锥猜想

The effective cone conjecture for Calabi--Yau pairs

Ruhr-Universität Bochum(鲁尔大学波鸿分校);National Taiwan University(台湾大学);National Center for Theoretical Sciences(国家理论科学中心);Leibniz University Hannover(汉诺威莱布尼茨大学);Fudan University(复旦大学);Shanghai Institute for Mathematics and Interdisciplinary Sciences(上海数学与交叉学科研究院)

Cécile Gachet, Hsueh-Yung Lin, Isabel Stenger, Long Wang

AI总结:

本文提出Calabi-Yau对的有效锥猜想,并证明其等价于可移动锥猜想,同时展示了光滑Calabi-Yau三次曲面的极小模型具有有理多面体nef锥。

摘要:

我们为klt Calabi-Yau对(X,Δ)提出了一个有效锥猜想,涉及有效除子锥Eff(X)在伪自同构子群PsAut(X,Δ)作用下的结构。假设在维度dim(X)中存在良好的极小模型,已知在维度不超过3时成立,我们证明了对于(X,Δ)的有效锥猜想等价于Kawamata-Morrison-Totaro可移动锥猜想,以及其他陈述。作为应用,我们显示Schoen引入并由Namikawa、Grassi和Morrison研究的光滑Calabi-Yau三次曲面的可移动锥猜想无条件成立。我们还显示对于这样的Calabi-Yau三次曲面X,除了X本身外,所有极小模型的nef锥都是有理多面体。

英文摘要:

We formulate an effective cone conjecture for klt Calabi--Yau pairs $(X,Δ)$, pertaining to the structure of the cone of effective divisors $\mathrm{Eff}(X)$ modulo the action of the subgroup of pseudo-automorphisms $\mathrm{PsAut}(X,Δ)$. Assuming the existence of good minimal models in dimension $\dim(X)$, known to hold in dimension up to $3$, we prove that the effective cone conjecture for $(X,Δ)$ is equivalent to the Kawamata--Morrison--Totaro movable cone conjecture for $(X,Δ)$, among other statements. As an application, we show that the movable cone conjecture unconditionally holds for the smooth Calabi--Yau threefolds introduced by Schoen and studied by Namikawa, Grassi and Morrison. We also show that for such a Calabi--Yau threefold $X$, all of its minimal models, apart from $X$ itself, have rational polyhedral nef cones.

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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