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arXiv 2609.09976math.AG

具有 nef 反典范除子的射影簇的自同构群与齐次纤维化

Automorphism groups and Homogeneous fibrations on projective varieties with nef anticanonical divisors

Zhan Li, Jinsong Xu

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中文总结 AI 辅助

本文研究具有 nef 反典范除子的代数簇的 Albanese 态射与极大有理链连通纤维化的齐次结构,构造自然群同态诱导 Aut^0 的 Chevalley 分解(相差等源),并类比 Nishi-Matsumura 定理,用现代语言重证之。

中文摘要 AI 辅助

我们研究了具有 nef 反典范除子的代数簇的 Albanese 态射与极大有理链连通纤维化的齐次结构。进一步,我们证明了与极大有理链连通纤维化相关存在一个自然群同态,该同态在相差一个等源(isogeny)的意义下诱导出 $\operatorname{Aut}^0$ 的 Chevalley 分解。此结果类似于 Nishi 和 Matsumura 关于 Albanese 态射的定理。此外,我们利用现代代数几何语言重新证明了 Nishi 和 Matsumura 的定理。

英文摘要

We explore the homogeneous structures of Albanese morphisms and maximal rationally chain-connected fibrations of algebraic varieties with nef anticanonical divisors. Furthermore, we show that there exists a natural group homomorphism associated with a maximal rationally chain-connected fibration, which induces the Chevalley decomposition of $\operatorname{Aut}^0$ up to an isogeny. This result is analogous to a similar theorem of Nishi and Matsumura for Albanese morphisms. In addition, we reprove Nishi and Matsumura's theorem using the modern language of algebraic geometry.

发表机构

  • Department of Mathematics, Southern University of Science and Technology(南方科技大学数学系)
  • Department of Mathematical Sciences, Xi’an Jiaotong-Liverpool University(西交利物浦大学数学科学系)

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