Profinite rigidity conjecture for cusped hyperbolic 3-manifolds

Let MM be a cusped hyperbolic 33-manifold, and let NN be a compact, orientable 33-manifold. The manifolds are profinally rigid when any isomorphism between their profinite fundamental groups forces the manifolds to be homeomorphic.

Profinite rigidity conjecture. Every cusped hyperbolic 33-manifold is profinitely rigid among compact, orientable 33-manifolds.

The conjecture is motivated by profinite detection of Dehn fillings and by the many known examples of profinitely rigid cusped hyperbolic 33-manifolds. The source presents the general assertion as a conjecture and gives no resolution.

Sources & referencesView supporting material

Primary source

Xiaoyu Xu, “Profinite rigidity witnessed by Dehn fillings of cusped hyperbolic 3-manifolds”, arXiv:2412.05229 (2026).

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