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ℓ2$\ell ^2$‐Betti numbers and coherence of random groups

Published version
Peer-reviewed

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Authors

Kielak, Dawid 
Kropholler, Robert 
Wilkes, Gareth 

Abstract

Abstract: We study ℓ 2 2 ‐Betti numbers, coherence and (virtual) fibring of random groups in the few‐relator model. In particular, random groups with negative Euler characteristic are coherent, have ℓ 2 2 ‐homology concentrated in dimension 1 and embed in a virtually free‐by‐cyclic group with high probability. In the case of Euler characteristic zero, we use Novikov homology to show that a random group is free‐by‐cyclic with positive probability.

Description

Funder: Clare College, Cambridge

Keywords

4904 Pure Mathematics, 49 Mathematical Sciences

Journal Title

Journal of the London Mathematical Society

Conference Name

Journal ISSN

0024-6107
1469-7750

Volume Title

Publisher

Wiley
Sponsorship
DFG (SPP2026)