Totaro's question for G_2, F_4, and E_6

Details Totaro's question for G_2, F_4, and E_6 Totaro's question for G_2, F_4, and E_6

2004-12-07

arxiv.org/abs/math/0412148v1

Journal of the London Mathematical Society 73 #2 (2006) 325-338

Mathematics

Algebraic Geometry

15 pages

Scientific paper

10.1112/S0024610705022489

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.

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