arXivDaily arXiv每日学术速递 周一至周五更新
北美退伍军人节(Veterans Day),12 日无更新
arXiv 2401.00951math.DS
收藏

关于膨胀曲面上叶状结构的研究

On the structure of foliations on dilation surfaces

Anna Sophie Schmidhuber

AI总结:

本文利用Gardiner的分解定理证明了膨胀曲面上方向叶状结构的结构定理,指出其叶状结构可分解为四种类型,并发现极小和类Cantor情况下首次返回映射半共轭于极小区间交换变换。

摘要:

膨胀曲面是以复平面为模型建立的几何曲面,其结构群由平移群和膨胀群生成。对于任何膨胀曲面,对于 $S^1$ 中的任何方向 $θ$,曲面上都存在一个称为方向 $θ$ 的方向叶状结构的叶状结构。在本论文中,我们利用 C.J. Gardiner 在20世纪80年代建立的分解定理,证明了膨胀曲面上方向叶状结构的结构定理。我们证明,给定任何膨胀曲面上的方向叶状结构,存在将该曲面分解为有限多个子曲面的分解,在这些子曲面上叶状结构处于四种可能情况之一:完全周期、Morse-Smale、极小或类Cantor。我们进一步证明,在后两种情况下,叶状结构横向截段上的首次返回映射半共轭于极小区间交换变换。作为推论,我们获得了仿射区间交换变换的类似结果。在整个论文中,我们用一个称为 Disco 曲面的膨胀曲面的显式例子来伴随我们的结果。我们分析了 Disco 曲面上表现出非平凡递归行为的方向叶状结构,并在几何上解释了为什么这些叶状结构聚集到 Cantor 集。

英文摘要:

Dilation surfaces are geometric surfaces modelled after the complex plane whose structure group is generated by the groups of translations and dilations. For any dilation surface, for any direction $θ$ in $S^1$, there exists a foliation on the surface called the directional foliation in direction $θ$. In this Thesis, we prove a structure theorem for the directional foliations on dilation surfaces using a decomposition theorem established by C.J. Gardiner in the 1980s. We show that given a directional foliation on any dilation surface, there exists a decomposition of the surface into finitely many subsurfaces on which the foliation structure is in one of four possible cases: completely periodic, Morse-Smale, minimal or Cantor-like. We further prove that in the last two cases, the first return map on a segment transversal to the foliation is semi-conjugated to a minimal interval exchange transformation. As a corollary, we obtain an analogous result for affine interval exchange transformations. Throughout the thesis, we accompany our results with an explicit example of a dilation surface called the Disco surface. We analyze the directional foliations on the Disco surface that exhibit non-trivially recurrent behaviour and explain geometrically why these foliations accumulate to a Cantor set.

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。

↑