关于椭圆曲线上半稳定$G$-丛的栈
代数几何
2015-07-28 v3
摘要
在最近的一篇论文中,Ben-Zvi和Nadler证明了从椭圆曲线上0次-丛到0次半稳定-丛的诱导映射是一个小映射,其伽罗瓦群同构于的Weyl群。我们将他们的结果推广到任意约化群的的所有连通分支。我们证明,对于每个度(即拓扑类型),存在唯一的抛物子群,使得该度的任何半稳定-丛都有到该子群的约化,并且诱导映射是小的,其伽罗瓦群为Levi的相对Weyl群。这为简单自守层提供了新的例子,这些自守层是平凡局部系统的Eisenstein层的组成部分。
引用
@article{arxiv.1406.6593,
title = {On the stack of semistable $G$-bundles over an elliptic curve},
author = {Dragos Fratila},
journal= {arXiv preprint arXiv:1406.6593},
year = {2015}
}
备注
19 pages; contains one table; more typos corrected; there was a gap in the proof (a subsection was added to repair that); added a few references and some remarks about the slope map; comments are welcomed!