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arXiv · 2106.14931

Random groups at density $d<3/14$ act non-trivially on a CAT(0) cube complex

MurphyKate Montee
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Abstract

For random groups in the Gromov density model at $d<3/14$, we construct walls in the Cayley complex $X$ which give rise to a non-trivial action by isometries on a CAT(0) cube complex. This extends results of Ollivier-Wise and Mackay-Przytycki at densities $d<1/5$ and $d<5/24$, respectively. We are able to overcome one of the main combinatorial challenges remaining from the work of Mackay-Przytycki, and we give a construction that plausibly works at any density $d<1/4$.

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MurphyKate Montee. 2021-06-28. Random groups at density $d<3/14$ act non-trivially on a CAT(0) cube complex. https://arxiv.org/abs/2106.14931

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