中文

辛商具有辛奇点

辛几何 2020-02-19 v3 代数几何 表示论

摘要

KK 为紧李群,其复化为 GG,并设 VV 为酉 KK-模。我们考虑齐次二次矩映射在零水平的实辛商 M0M_0 以及复辛商,后者在此定义为 M0M_0 的复化。我们证明,若 (V,G)(V, G)33-大的(一个一般成立的条件),则复辛商具有辛奇点且是分次 Gorenstein 的。这特别意味着实辛商是分次 Gorenstein 的。在 KK 为环面或 SU2\operatorname{SU}_2 的情形,我们证明这些结果在无需 (V,G)(V,G)33-大的假设下成立。

关键词

引用

@article{arxiv.1706.02089,
  title  = {Symplectic quotients have symplectic singularities},
  author = {Hans-Christian Herbig and Gerald W. Schwarz and Christopher Seaton},
  journal= {arXiv preprint arXiv:1706.02089},
  year   = {2020}
}

备注

35 pages. v2: Fixed gap in first version (the proof of Corollary 3.14 in v1 only applies if the slice is taken at a real point). Hypothesis for the main results changed from 2-large to 3-large, added Sections 3.3 and 3.5, and improved exposition. v3: Added Lemma 3.17, improved exposition. Final preprint version accepted by Compositio Mathematica (not the published version)