Structure of Fano fibrations of varieties admitting an int-amplified endomorphism

Structure of Fano fibrations of varieties admitting an int-amplified endomorphism
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承认整数放大内同态的品种的 Fano 纤维结构

DOI:
10.1016/j.aim.2021.107964
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发表时间:
2021
影响因子:
1.7
通讯作者:
Yoshikawa Shou
Yoshikawa Shou
中科院分区:
数学1区
文献类型:
--
作者:
Ruying Wang;Kumar Bhatta and Yasuo Ohe;柳沢直也,栗田玲;Yoshikawa Shou

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本文研究了具有int-放大自同态簇的Fano纤维化的结构。证明了:若正规Q-阶乘klt投射簇X有int-放大自同态,则存在余维为1的有限态射X → X,使得X在其Albanese簇上是Fano型的.作为推论,如果我们进一步假设X是光滑的且有理连通的,则X是Fano型的。
In this paper, we study the structure of Fano fibrations of varieties admitting an int-amplified endomorphism. We prove that if a normal Q-factorial klt projective variety X has an int-amplified endomorphism, then there exists an étale in codimension one finite morphism X˜→ X such that X˜ is of Fano type over its Albanese variety. As a corollary, if we further assume that X is smooth and rationally connected, then X is of Fano type.
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