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arXiv 2008.09717math.DS
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图的次幂零流形上的Anosov同构

Anosov diffeomorphisms on infra-nilmanifolds associated to graphs

Jonas Deré, Meera Mainkar

摘要:

闭黎曼流形上的Anosov同构是一类具有一致双曲行为的动力系统。因此,它们的性质被深入研究,包括哪些空间允许这样的一个同构。证明了任何容许Anosov同构的闭流形都同胚于亚零流形,即1-连通幂零李群与离散等距群的紧商.这一猜想激发了描述哪些亚nilmanifold承认一个Anosov同构的问题。迄今为止,大多数的研究都集中在限制类的幂零流形上,即1-连通幂零李群在一致格上的等价物。例如,Dani和Mainkar研究了与图相关的流形的这个问题,这些流形形成了自由幂零李群上的流形的自然推广。本文将他们的工作进一步推广到与图有关的全类次幂流形,得到了一个只依赖于和乐群在定义图上的诱导作用的充要条件.作为应用,我们从单图上的和乐群的忠实作用出发,构造了具有循环和乐群且允许Anosov同构的亚零流形族.

英文摘要:

Anosov diffeomorphisms on closed Riemannian manifolds are a type of dynamical systems exhibiting uniform hyperbolic behavior. Therefore their properties are intensively studied, including which spaces allow such a diffeomorphism. It is conjectured that any closed manifold admitting an Anosov diffeomorphism is homeomorphic to an infra-nilmanifold, i.e. a compact quotient of a 1-connected nilpotent Lie group by a discrete group of isometries. This conjecture motivates the problem of describing which infra-nilmanifolds admit an Anosov diffeomorphism. So far, most research was focused on the restricted class of nilmanifolds, which are quotients of 1-connected nilpotent Lie groups by uniform lattices. For example, Dani and Mainkar studied this question for the nilmanifolds associated to graphs, which form the natural generalization of nilmanifolds modeled on free nilpotent Lie groups. This paper further generalizes their work to the full class of infra-nilmanifolds associated to graphs, leading to a necessary and sufficient condition depending only on the induced action of the holonomy group on the defining graph. As an application, we construct families of infra-nilmanifolds with cyclic holonomy groups admitting an Anosov diffeomorphism, starting from faithful actions of the holonomy group on simple graphs.

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