Nielsen realization for aspherical closed manifolds with hyperbolic fundamental group

Let MM be an aspherical closed manifold with hyperbolic fundamental group π\pi. Let j ⁣:GOut(π)j\colon G\to \operatorname{Out}(\pi) be an embedding of a finite group GG into the outer automorphism group of π\pi. Let Aut(M)\operatorname{Aut}(M) denote the group of self-homeomorphisms of MM, and let ν ⁣:Aut(M)Out(π)\nu\colon \operatorname{Aut}(M)\to \operatorname{Out}(\pi) be the canonical map induced by the action on the fundamental group. Nielsen realization conjecture. There is an effective topological GG-action ρ ⁣:GAut(M)\rho\colon G\to \operatorname{Aut}(M) on MM such that

νρ=j.\nu\circ\rho=j.

This asserts that every finite subgroup of the outer automorphism group of a hyperbolic fundamental group is realized by an effective topological action on the corresponding aspherical closed manifold. The source notes that, to the authors' knowledge, there is no counterexample; the general status is not established here.

Sources & referencesView supporting material

Primary source

Wolfgang Lueck, “On Brown's Problem, Poincare' models for the classifying spaces for proper actions and Nielsen Realization”, arXiv:2201.10807 (2022).

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