On properness of K-moduli spaces and optimal degenerations of Fano varieties
On properness of K-moduli spaces and optimal degenerations of Fano varieties
复制标题
DOI:
10.1007/s00029-021-00694-7
复制
发表时间:
2021-07
期刊:
影响因子:
--
通讯作者:
Harold Blum;Daniel Halpern-Leistner;Yuchen Liu;Chenyang Xu
中科院分区:
文献类型:
--
作者:
Harold Blum;Daniel Halpern-Leistner;Yuchen Liu;Chenyang Xu
We establish an algebraic approach to prove the properness of moduli spaces of K-polystable Fano varieties and reduce the problem to a conjecture on destabilizations of K-unstable Fano varieties. Specifically, we prove that if the stability threshold of every K-unstable Fano variety is computed by a divisorial valuation, then such K-moduli spaces are proper. The argument relies on studying certain optimal destabilizing test configurations and constructing a-stratification on the moduli stack of Fano varieties.