Self-Inverses, Lagrangian Permutations and Minimal Interval Exchange Transformations with Many Ergodic Measures
Jon Fickenscher
备注:
This paper strictly contains the information in "Self-Inverses in Rauzy Classes" that concerns 'true' permutations. Other than revisions and general improvements, the following portions are entirely new: Sections 1.4-1.5 and Section 4. arXiv admin note: substantial text overlap with arXiv:1103.3485
感谢M的作品。Kontsevich和A. Zorich其次是C.布瓦西,我们有一个任何给定属的所有Rauzy类的分类。从这些工作可以看出,Rauzy类在逆置换的操作下是封闭的。本文通过给出满足充分条件的自逆置换元的显式构造,证明了任意Rauzy类中自逆置换的存在性。我们还将证明自逆置换是拉格朗日的,这意味着任何悬挂都有其垂直循环跨越同调的拉格朗日子空间。这将简化G. Forni. W. A. Veech证明了一个界限的数目不同的遍历概率测度为一个给定的最小区间交换变换。我们通过在每个Rauzy类中构造例子来验证这个界是尖锐的。
英文摘要:
Thanks to works by M. Kontsevich and A. Zorich followed by C. Boissy, we have a classification of all Rauzy Classes of any given genus. It follows from these works that Rauzy Classes are closed under the operation of inverting the permutation. In this paper, we shall prove the existence of self-inverse permutations in every Rauzy Class by giving an explicit construction of such an element satisfying the sufficient conditions. We will also show that self-inverse permutations are Lagrangian, meaning any suspension has its vertical cycles span a Lagrangian subspace in homology. This will simplify the proof of a lemma in a work by G. Forni. W. A. Veech proved a bound on the number of distinct ergodic probability measures for a given minimal interval exchange transformation. We verify that this bound is sharp by construcing examples in each Rauzy Class.
We prove that a shift ergodic measure on a topologically mixing sub-shift is isomorphic to a Bernoulli shift whenever it is quasi invariant under permutations of finite number of coordinates. We prove also that Gibbs measures on topologically mixing subshift of finite type are quasi invariant.
In this paper we give explicit characterizations, based on the cutting and spacer parameters, of (a) which rank-one transformations factor onto a given finite cyclic permutation, (b) which rank-one transformations factor onto a given odometer, and (c) which rank-one transformations are isomorphic to a given odometer. These naturally yield characterizations of (d) which rank-one transformations factor onto some (unspecified) finite cyclic permutation, (d') which rank-one transformations are totally ergodic, (e) which rank-one transformations factor onto some (unspecified) odometer, and (f) whic…