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arXiv 1104.0216math.RTmath.GR
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关于球面扭共轭类

On spherical twisted conjugacy classes

Giovanna Carnovale

摘要:

设G是具有好奇特征的代数闭域上的单代数群,θ是G的Dynkin图对合的自同构.我们证明了球面θ-扭曲共轭类恰好是那些只与外尔群中扭曲对合对应的Bruhat胞相交的类.我们展示了如何模拟这一声明失败的triality的情况下。我们推广到好的奇特征J-H。球面扭共轭类的Lu维数公式。

英文摘要:

Let G be a simple algebraic group over an algebraically closed field of good odd characteristic, and let theta be an automorphism of G arising from an involution of its Dynkin diagram. We show that the spherical theta-twisted conjugacy classes are precisely those intersecting only Bruhat cells corresponding to twisted involutions in the Weyl group. We show how the analogue of this statement fails in the triality case. We generalize to good odd characteristic J-H. Lu's dimension formula for spherical twisted conjugacy classes.

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