纯维数的 Spaltenstein 簇
表示论
2020-02-18 v3 辛几何
摘要
我们证明当所涉幂零元素的 Jordan 型为偶或奇划分时,经典群的 Spaltenstein 簇是纯维数的。我们进一步证明,在相伴幂零 Slodowy 切片的偏解奇中它们是 Lagrangian 的,由此可知其维数等于该偏解奇维数之半减去幂零轨道的维数。随后结果被推广至 -箭图簇设定。
引用
@article{arxiv.1901.00385,
title = {Spaltenstein varieties of pure dimension},
author = {Yiqiang Li},
journal= {arXiv preprint arXiv:1901.00385},
year = {2020}
}
备注
Updates after publication, as the new Section 1.7, are added: a stronger result than Theorem A is made explicit among others