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arXiv 1502.04276math.DG
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有界等距与齐次商

Bounded Isometries and Homogeneous Quotients

Joseph A. Wolf

摘要:

在本文中,我们给出了一个明确的描述一类空间,其中包括黎曼流形的有界位移等距。这类空间由度量空间(因此也包括芬斯勒流形)组成,在这些空间上指数可解的李群通过等距作用传递。证明了有界等距映射是常位移的。他们的特征进一步证明了作者1962年猜想齐次黎曼商流形。该猜想表明,如果$Γ\backslash M$是连通单连通齐次黎曼流形$M$的黎曼商,则$Γ\backslash M$是齐次的当且仅当每个等距$γ\in Γ$是常位移的。我们对有界等距的描述给出了J. Tits关于半单李群有界自同构的一个旧结果的另一种证明。主题的恒定位移等距有一个有趣的历史,开始与克利福德的使用四元数在非欧几里德几何,我们素描,在一个历史说明。

英文摘要:

In this paper we give an explicit description of the bounded displacement isometries of a class of spaces that includes the Riemannian nilmanifolds. The class of spaces consists of metric spaces (and thus includes Finsler manifolds) on which an exponential solvable Lie group acts transitively by isometries. The bounded isometries are proved to be of constant displacement. Their characterization gives further evidence for the author's 1962 conjecture on homogeneous Riemannian quotient manifolds. That conjecture suggests that if $Γ\backslash M$ is a Riemannian quotient of a connected simply connected homogeneous Riemannian manifold $M$, then $Γ\backslash M$ is homogeneous if and only if each isometry $γ\in Γ$ is of constant displacement. Our description of bounded isometries gives an alternative proof of an old result of J. Tits on bounded automorphisms of semisimple Lie groups. The topic of constant displacement isometries has an interesting history, starting with Clifford's use of quaternions in non--euclidean geometry, and we sketch that in a historical note.

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。

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