Topological Zimmer conjecture for low-dimensional compact manifolds

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Let n≥3n\geq 3, and let MrM^r be a connected compact rr-dimensional manifold with r<n−1r<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.

References

Primary source

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

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