Profinite rigidity and almost rigidity in 3-manifolds
- đ¤ Speaker: Xiaoyu Xu (Peking University)
- đ Date & Time: Thursday 31 July 2025, 14:00 - 15:00
- đ Venue: Seminar Room 1, Newton Institute
Abstract
In this talk, I will discuss the almost profinite rigidity among the fundamental group of compact orientable 3-manifolds with empty or toral boundary. I will also introduce some examples of cusped hyperbolic and mixed 3-manifolds whose fundamental groups are profinitely rigid among all 3-manifold groups. The key ingredient is a property called “peripheral regularity” for profinite isomorphisms between cusped hyperbolic 3-manifolds.
Series This talk is part of the Isaac Newton Institute Seminar Series series.
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Xiaoyu Xu (Peking University)
Thursday 31 July 2025, 14:00-15:00