Sharp cohomological bound for uniformly quasiregularly elliptic manifolds

Abstract

We show that if a compact, connected, and oriented $n$-manifold $M$ without boundary admits a non-constant non-injective uniformly quasiregular self-map, then the dimension of the real singular cohomology ring $H^{\ast }(M;\mathbb{R})$ of $M$ is bounded from above by $2^n$. This is a positive answer to a dynamical counterpart of the Bonk-Heinonen conjecture on the cohomology bound for quasiregularly elliptic manifolds. The proof is based on an intermediary result that, if $M$ is not a rational homology sphere, then each such uniformly quasiregular self-map on $M$ has a Julia set of positive Lebesgue measure.

References in corpus (1)

• Uniform cohomological expansion of uniformly quasiregular mappings

Cited by in corpus (3)

• Conformally formal manifolds and the uniformly quasiregular non-ellipticity of $({\mathbb{S}}^2\times {\mathbb{S}}^2)\#({\mathbb{S}}^2\times {\mathbb{S}}^2)$
• Entropy in uniformly quasiregular dynamics
• Obstructions for automorphic quasiregular maps and Lattès-type uniformly quasiregular maps