Topological Zimmer conjecture for low-dimensional compact manifolds

Let n3n\geq 3, and let MrM^r be a connected compact rr-dimensional manifold with r<n1r<n-1. A group action of SLn(Z)\mathrm{SL}_{n}(\mathbb{Z}) on MM by homeomorphisms is equivalently a homomorphism

SLn(Z)Homeo(M).\mathrm{SL}_{n}(\mathbb{Z})\longrightarrow \operatorname{Homeo}(M).

Topological Zimmer conjecture. Every such action factors through a finite group; equivalently, every homomorphism

SLn(Z)Homeo(M)\mathrm{SL}_{n}(\mathbb{Z})\longrightarrow \operatorname{Homeo}(M)

has finite image.

This is the topological form of Zimmer's program for special linear groups. The survey records proofs in several cases, including one-dimensional manifolds, tori, spheres, products of two spheres, flat manifolds, nilpotent manifolds, and certain orientable manifolds, but the general statement remains open.

Sources & referencesView supporting material

Primary source

Shengkui Ye, “A survey of topological Zimmer's program”, arXiv:2002.01206 (2022).

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