Deformations of Log Terminal and Semi Log Canonical Singularities

Deformations of Log Terminal and Semi Log Canonical Singularities
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DOI:
10.1017/fms.2023.28
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发表时间:
2022-04
期刊:
Forum of Mathematics, Sigma
影响因子:
--
通讯作者:
Kenta Sato;S. Takagi
Kenta Sato;S. Takagi
中科院分区:
其他
文献类型:
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作者:
Kenta Sato;S. Takagi

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摘要本文证明了当一般纤维为$\mathbb {Q}$ -Gorenstein时,klt奇点在形变下不变.对于slc奇点,我们也得到了类似的结果。这些是Esnault-Viehweg [Math.Ann.271(1985),439-449]和S.石井[Math.Ann.275(1986),139-148; Singularities(爱荷华州City,IA,1986)Contemporary Mathematics,vol.90(American Mathematical Society,普罗维登斯,RI,1989),135-145].
Abstract In this paper, we prove that klt singularities are invariant under deformations if the generic fiber is $\mathbb {Q}$ -Gorenstein. We also obtain a similar result for slc singularities. These are generalizations of results of Esnault-Viehweg [Math. Ann. 271 (1985), 439–449] and S. Ishii [Math. Ann. 275 (1986), 139–148; Singularities (Iowa City, IA, 1986) Contemporary Mathematics, vol. 90 (American Mathematical Society, Providence, RI, 1989), 135–145].