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arXiv 2608.30855math.AG

四次椭圆曲线退化与法诺三维簇的K-模空间

Degenerations of elliptic quartics and K-moduli of Fano threefolds

  • University of Edinburgh(爱丁堡大学)
  • Brunel University London(伦敦布鲁内尔大学)
  • University of Maryland(马里兰大学)

机构由 AI 辅助整理,请以论文原文为准。

Ivan Cheltsov, Anne-Sophie Kaloghiros, Robert Śmiech, Junyan Zhao

AI总结:

本文研究经两次爆破构造的法诺三维簇的K-模空间,将其同构于带CM线丛线性化的VGIT商空间,分类了该形变族的K-(半/多)稳定成员,相关证明用到希尔伯特概型几何等新要素。

AI中文摘要:

我们研究一类法诺三维簇的K-模空间,这类法诺三维簇的构造方式为:先沿一条四次椭圆曲线$C$对$\boldsymbol{P}^3$进行爆破,再沿例外除子$E \to C$的一条纤维$\boldsymbol{\beta}_p$进行二次爆破。我们证明该K-模空间同构于一个VGIT商空间,其参数化的是带CM线丛诱导线性化的配对$(C,p)$。特别地,我们对该形变族中所有K-(半/多)稳定成员进行了分类。证明中的主要新要素包括四次椭圆曲线的希尔伯特概型几何、法诺-K3配对的形变理论,以及三维簇奇点局部体积的最优界。

英文摘要:

We study the K-moduli space of Fano threefolds obtained by first blowing up $\mathbb{P}^3$ along an elliptic quartic curve $C$ and then blowing up a fiber $\ell_p$ of the exceptional divisor $E \to C$. We prove that this K-moduli space is isomorphic to a VGIT quotient parametrizing pairs $(C,p)$, with linearization induced by the CM line bundle. In particular, we classify all K-(semi/poly)stable members of this deformation family. The main new ingredients in the proof include the geometry of the Hilbert scheme of elliptic quartic curves, deformation theory of Fano--K3 pairs, and optimal bounds on the local volumes of threefold singularities.

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