The Geometric Gersten conjecture for translation-like actions

Let GG be a finitely generated group. A group is word-hyperbolic in the sense of Gromov, and a group acts translation-like on GG when the action is free and each group element moves points by a uniformly bounded distance in a Cayley graph of GG. A Baumslag–Solitar group is a group of the form B(1,n)=a,ttat1=anB(1,n)=\langle a,t\mid tat^{-1}=a^n\rangle for some nonzero integer nn.

Geometric Gersten conjecture. If GG is a finitely generated group that is not word-hyperbolic, then some Baumslag–Solitar group acts translation-like on GG.

The source presents this as a geometric version of a conjecture of Gersten proposed by Whyte and says that it would complete the characterization of finitely generated groups having a weakly aperiodic SFT. Its status is not resolved in the supplied text.

Sources & referencesView supporting material

Primary source

Emmanuel Jeandel, “Translation-like Actions and Aperiodic Subshifts on Groups”, arXiv:1508.06419 (2015).

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