Quasiregular cobordism theorem
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arXiv
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| Format: | Preprint |
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2019
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| _version_ | 1866913246107140096 |
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| author | Pankka, Pekka Wu, Jang-Mei |
| author_facet | Pankka, Pekka Wu, Jang-Mei |
| contents | In this article we prove that, for an oriented PL $n$-manifold $M$ with $m$ boundary components and $d_0\in \mathbb N$, there exist mutually disjoint closed Euclidean balls and a $\mathsf K$-quasiregular mapping $M \to \mathbb S^n \setminus \mathrm{int}(B_1\cup \cdots \cup B_m)$ of degree at least $d_0$. The result is quantitative in the sense that the distortion $\mathsf K$ of the mapping does not depend on the degree.
As applications of this construction, we obtain Rickman's large local index theorem for quasiregular maps to all dimensions $n\ge 4$. We also construct, in dimension $n=4$, a version of a wildly branching quasiregular map of Heinonen and Rickman, and a uniformly quasiregular map of arbitrarily large degree whose Julia set is a wild Cantor set.
The existence of a wildly branching quasiregular map yields an example of a metric $4$-sphere $(\mathbb S^4,d)$, which is not bilipschitz equivalent to the Euclidean $4$-sphere $\mathbb S^4$ but which admits a BLD-map to $\mathbb S^4$.
For the proof of the main theorem, we develop a dimension-free deformation method for cubical Alexander maps. For cubical and shellable Alexander maps this completes the $2$-dimensional deformation theory originated by S.~Rickman in 1985. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_1904_09095 |
| institution | arXiv |
| publishDate | 2019 |
| record_format | arxiv |
| spellingShingle | Quasiregular cobordism theorem Pankka, Pekka Wu, Jang-Mei Complex Variables Differential Geometry Geometric Topology Metric Geometry Primary 30C65, Secondary 57M12, 30L10 In this article we prove that, for an oriented PL $n$-manifold $M$ with $m$ boundary components and $d_0\in \mathbb N$, there exist mutually disjoint closed Euclidean balls and a $\mathsf K$-quasiregular mapping $M \to \mathbb S^n \setminus \mathrm{int}(B_1\cup \cdots \cup B_m)$ of degree at least $d_0$. The result is quantitative in the sense that the distortion $\mathsf K$ of the mapping does not depend on the degree. As applications of this construction, we obtain Rickman's large local index theorem for quasiregular maps to all dimensions $n\ge 4$. We also construct, in dimension $n=4$, a version of a wildly branching quasiregular map of Heinonen and Rickman, and a uniformly quasiregular map of arbitrarily large degree whose Julia set is a wild Cantor set. The existence of a wildly branching quasiregular map yields an example of a metric $4$-sphere $(\mathbb S^4,d)$, which is not bilipschitz equivalent to the Euclidean $4$-sphere $\mathbb S^4$ but which admits a BLD-map to $\mathbb S^4$. For the proof of the main theorem, we develop a dimension-free deformation method for cubical Alexander maps. For cubical and shellable Alexander maps this completes the $2$-dimensional deformation theory originated by S.~Rickman in 1985. |
| title | Quasiregular cobordism theorem |
| topic | Complex Variables Differential Geometry Geometric Topology Metric Geometry Primary 30C65, Secondary 57M12, 30L10 |
| url | https://arxiv.org/abs/1904.09095 |