Generic stabilizers associated with a peculiar half-spin representation. Appendix to: SPINORS AND ESSENTIAL DIMENSION by S. Garibaldi and R. Guralnick

Generic stabilizers associated with a peculiar half-spin representation. Appendix to: SPINORS AND ESSENTIAL DIMENSION by S. Garibaldi and R. Guralnick
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与特殊的半自旋表示相关的通用稳定器。

DOI:
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发表时间:
2017
期刊:
影响因子:
--
通讯作者:
A. Premet
A. Premet
中科院分区:
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作者:
S. Garibaldi;R. Guralnick;A. Premet

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我们证明了自旋群一般自由地作用于各种旋量模块,在这个意义上的组计划,并在某种程度上,不依赖于基场的特性。因此,我们扩展了Brosnan-Reichstein-Vistoli(Annals of Math.,2010)和Chernousov-Merkurjev(代数与数论,2014)的特征不同于2的领域。我们还完成了一般稳定剂的自旋和半自旋集团的低秩的确定。
We prove that spin groups act generically freely on various spinor modules, in the sense of group schemes and in a way that does not depend on the characteristic of the base field. As a consequence, we extend the surprising calculation of the essential dimension of spin groups and half-spin groups in characteristic zero by Brosnan–Reichstein–Vistoli (Annals of Math., 2010) and Chernousov–Merkurjev (Algebra & Number Theory, 2014) to fields of characteristic different from 2. We also complete the determination of generic stabilizers in spin and half-spin groups of low rank.
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