Profiniteness of higher rank volume

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• Holger Kammeyer (Heinrich-Heine-Universität Düsseldorf)
• Monday 28 July 2025, 10:15-11:15
• Seminar Room 1, Newton Institute.

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OGGW01 - Discrete and profinite groups

While many properties such as amenability, property (T) and FA, finiteness properties, Euler characteristic, ... can differ for profinitely isomorphic groups, we present a result in the positive direction: The covolume of lattices in higher rank Lie groups with the congruence subgroup property is determined by the profinite completion. Without relying on CSP , we additionally show that volume is a profinite invariant of octonionic hyperbolic congruence manifolds. Joint work with Steffen Kionke and Ralf Köhl.

This talk is part of the Isaac Newton Institute Seminar Series series.

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