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arXiv 1809.09192math.DSmath.GR
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群作用的熵、李雅普诺夫指数和刚性

Entropy, Lyapunov exponents, and rigidity of group actions

Aaron W. Brown, Sébastien Alvarez, Dominique Malicet, Davi Obata, Mario Roldán, Bruno Santiago, Michele Triestino

摘要:

本文是一个扩展系列的讲义的基础上,在题为“研讨会为年轻的研究人员:集团作用于流形”在巴西特雷索波利斯举行的研讨会上给出的5小时的课程于2016年6月。该课程介绍了光滑遍历论中的一些经典工具-特别是李雅普诺夫指数和度量熵-作为研究流形上群作用刚性性质的工具。我们并不提出对群作用或一般刚性程序的综合处理。相反,我们专注于两个刚性结果在高秩动力学:测量刚性定理仿射Anosov阿贝尔作用在环面由于A。Katok和R. Spatzier [遍历论]动力学Systems 16,1996]和主要作者与D. Fisher,S. F.乌尔塔多Rodriguez Hertz和Z. Wang关于流形上高阶半单李群中格的作用[arXiv:1608.04995; arXiv:1610.09997].我们给出了完整的证明这些结果,并提出了充分的背景光滑遍历论所需的证明。一个统一的主题,在这篇文章中是使用度量熵和它的关系的几何条件措施沿叶理作为一种机制,以验证不变性的措施。

英文摘要:

This text is an expanded series of lecture notes based on a 5-hour course given at the workshop entitled "Workshop for young researchers: Groups acting on manifolds" held in Teresópolis, Brazil in June 2016. The course introduced a number of classical tools in smooth ergodic theory -- particularly Lyapunov exponents and metric entropy -- as tools to study rigidity properties of group actions on manifolds. We do not present comprehensive treatment of group actions or general rigidity programs. Rather, we focus on two rigidity results in higher-rank dynamics: the measure rigidity theorem for affine Anosov abelian actions on tori due to A. Katok and R. Spatzier [Ergodic Theory Dynam. Systems 16, 1996] and recent the work of the main author with D. Fisher, S. Hurtado, F. Rodriguez Hertz, and Z. Wang on actions of lattices in higher-rank semisimple Lie groups on manifolds [arXiv:1608.04995; arXiv:1610.09997]. We give complete proofs of these results and present sufficient background in smooth ergodic theory needed for the proofs. A unifying theme in this text is the use of metric entropy and its relation to the geometry of conditional measures along foliations as a mechanism to verify invariance of measures.

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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