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arXiv 1702.08808math.AG
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二维KLT Calabi-Yau正则光滑偶上实结构的光滑性

Finiteness of real structures on KLT Calabi-Yau regular smooth pairs of dimension 2

Mohamed Benzerga

摘要:

本文证明了一个光滑的射影复曲面$X$,它是正则的(即使得$h^1(X,\mathcal O_X)=0$),它有一个$\mathbb{R}$ -因子$Δ$,使得$(X,Δ)$是一个KLT Calabi-Yau对,它有许多实形式直到同构.为此,我们利用Totaro锥定理构造了一个完备的CAT(0)度量空间,使$\text{Aut }X$在该空间上不连续地、等距地紧.然后我们给出一个例子,一个光滑的有理曲面有很多实形式,但有一个很大的自同构群,我们以前的结果(见https://arxiv.org/abs/1409.3490)没有预测这种有限性。

英文摘要:

In this article, we prove that a smooth projective complex surface $X$ which is regular (i.e. such that $h^1(X,\mathcal O_X)=0$) and which has a $\mathbb{R}$-divisor $Δ$ such that $(X,Δ)$ is a KLT Calabi-Yau pair has finitely many real forms up to isomorphism. For this purpose, we construct a complete CAT(0) metric space on which $\text{Aut }X$ acts properly discontinuously and cocompactly by isometries, using Totaro's Cone Theorem. Then we give an example of a smooth rational surface with finitely many real forms but having a so large automorphism group that our previous result (see https://arxiv.org/abs/1409.3490) does not predict this finiteness.

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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