arXivDaily arXiv每日学术速递 周一至周五更新
arXiv math/0412148math.AG
收藏

G_2、F_4和E_6的Totaro问题

Totaro's question for G_2, F_4, and E_6

Skip Garibaldi, Detlev Hoffmann

摘要:

在2004年的一篇论文中,Totaro提出了一个问题:如果G-torsor X的零圈的度数d > 0,那么它是否一定会有一个度除d的闭临界点,这里G是一个连通的代数群。这个问题与关于例外代数群的几个定理密切相关。Totaro在下列情况下对这个问题给出了肯定的回答:G是单的,是可裂的,是G_2型的,是F_4型的,是E_6型的单连通的.我们将答案为“是”的情形列表推广到所有G_2型群和一些F_4和E_6型不可裂群。没有对基本场的特性作出任何假设。关键的工具是一个引理,关于链接的Pfister形式。

英文摘要:

In a 2004 paper, Totaro asked whether a G-torsor X that has a zero-cycle of degree d > 0 will necessarily have a closed etale point of degree dividing d, where G is a connected algebraic group. This question is closely related to several conjectures regarding exceptional algebraic groups. Totaro gave a positive answer to his question in the following cases: G simple, split, and of type G_2, type F_4, or simply connected of type E_6. We extend the list of cases where the answer is "yes" to all groups of type G_2 and some nonsplit groups of type F_4 and E_6. No assumption on the characteristic of the base field is made. The key tool is a lemma regarding linkage of Pfister forms.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑