幂零轨道闭包的余切模型
Cotangent Models of Nilpotent Orbit Closures
AI总结:
针对复单李代数的幂零轨道闭包,本文对经典型中具有仿射余切丛结构的轨道闭包分类,证明G₂、F₄、E₈型中不存在此类轨道闭包。
AI中文摘要:
设𝔤为复单李代数,𝒪为其中非零幂零轨道。对经典型𝔤,我们对同构于光滑拟仿射簇X的仿射余切丛(T^*X)^aff的轨道闭包$\bar{\boldsymbol{\textit{𝒪}}}$进行分类;对G₂、F₄、E₈型,证明不存在非零幂零轨道闭包具有此类余切模型。
英文摘要:
Let $\mathcal O$ be a nonzero nilpotent orbit in a complex simple Lie algebra $\mathfrak g$. For $\mathfrak g$ of classical type, we classify the orbit closures $\overline{\mathcal O}$ that are isomorphic to $(T^*X)^{\mathrm{aff}}$ for a smooth quasi-affine variety $X$. In types $G_2$, $F_4$, and $E_8$, we show that no nonzero nilpotent orbit closure admits such a cotangent model.