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arXiv 1708.01451math.CVmath.DS
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一致拟正则映射的一致上同调展开

Uniform cohomological expansion of uniformly quasiregular mappings

Ilmari Kangasniemi, Pekka Pankka

摘要:

设$f\colon M \to M$是紧致连通定向黎曼流形$n$ -无边界流形$M$的一致拟正则自映射,$n\ge 2$ .我们证明了对于$k \in \{0,\ldots, n\}$,诱导同态$f^* \colon H^k(M;\mathbb{R}) \to H^k(M;\mathbb{R})$是复可对角化的,其中$H^k(M;\mathbb{R})$是$M$的$k$:th奇异上同调,并且$f^*$的特征值具有模$(\mathrm{deg}\ f)^{k/n}$ .作为应用,我们得到了闭流形上一致拟正则自映射的一个度限制。在主要定理的证明中,我们使用了基于共形不变微分形式的Sobolev-de Rham上同调和一个诱导的前推算子。

英文摘要:

Let $f\colon M \to M$ be a uniformly quasiregular self-mapping of a compact, connected, and oriented Riemannian $n$-manifold $M$ without boundary, $n\ge 2$. We show that, for $k \in \{0,\ldots, n\}$, the induced homomorphism $f^* \colon H^k(M;\mathbb{R}) \to H^k(M;\mathbb{R})$, where $H^k(M;\mathbb{R})$ is the $k$:th singular cohomology of $M$, is complex diagonalizable and the eigenvalues of $f^*$ have modulus $(\mathrm{deg}\ f)^{k/n}$. As an application, we obtain a degree restriction for uniformly quasiregular self-mappings of closed manifolds. In the proof of the main theorem, we use a Sobolev--de Rham cohomology based on conformally invariant differential forms and an induced push-forward operator.

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