On positivity of the CM line bundle on K-moduli spaces
On positivity of the CM line bundle on K-moduli spaces
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DOI:
10.4007/annals.2020.192.3.7
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发表时间:
2019-12
影响因子:
4.9
通讯作者:
Chenyang Xu-;Ziquan Zhuang
中科院分区:
文献类型:
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作者:
Chenyang Xu-;Ziquan Zhuang
In this paper, we consider the CM line bundle on the K-moduli space, i.e., the moduli space parametrizing K-polystable Fano varieties. We prove it is ample on any proper subspace parametrizing reduced uniformly K-stable Fano varieties which conjecturally should be the entire moduli space. As a corollary, we prove that the moduli space parametrizing smoothable K-polystable Fano varieties is projective. During the course of proof, we develop a new invariant for filtrations which can be used to test various K-stability notions of Fano varieties.