中文

Toric hyperkähler varieties 的特征化:面向符号奇点

代数几何 2025-10-21 v5

摘要

(X,ω)(X, \omega) 为维数为 2n2n 的锥形符号变量,具有射影符号解析。若 XX 容许来自 nn 维代数环面 TnT^n 的有效Hamiltonian作用于其上,且与锥形 C\mathbf{C}^* 作用相容,则典型例子为 toric hyperkähler variety Y(A,0)Y(A,0)。本文我们证明,这一性质特征化 Y(A,0)Y(A,0) 其中 AA 为 unimodular。更精确地说,若 (X,ω)(X, \omega) 满足上述条件,则存在 TnT^n 等价(复分析)同构 φ:(X,ω)(Y(A,0),ωY(A,0))\varphi: (X, \omega) \to (Y(A,0), \omega_{Y(A,0)}),使得两个矩映射被识别。此外,φ\varphiXX 的中心 0X0_X 送至 Y(A,0)Y(A,0) 的中心 0Y(A,0)0_{Y(A,0)}

关键词

引用

@article{arxiv.2408.03012,
  title  = {Towards a characterization of toric hyperk\"{a}hler varieties among symplectic singularities},
  author = {Yoshinori Namikawa},
  journal= {arXiv preprint arXiv:2408.03012},
  year   = {2025}
}

备注

Ver 2: 40 pages: Minor corrections, Ver 3: We add Question in the introduction. Moreover, we add Proposition (4.6) which makes the argument more precise in the description of the local structure of the relative moment map. Ver 4: Obvious mistakes at the beginning of the proof of Prop (3.4) are corrected. Ver5: Final version (To appear in Selecta Math.)