Virtually nilpotent groups' profile equivalence conjecture

Let GG be a finitely generated virtually nilpotent group, let SS be a finite generating set, and let DG,Ssof\mathcal{D}_{G,S}^{sof}, DG,Shyp\mathcal{D}_{G,S}^{hyp}, DG,Slin\mathcal{D}_{G,S}^{lin}, and DG,Sfin\mathcal{D}_{G,S}^{fin} denote its sofic, hyperlinear, linear sofic, and weakly sofic profiles. Let ΦG,S(n)\Phi_{G,S}(n) denote the full residual finiteness growth. The virtually nilpotent profile conjecture.

DG,Ssof(n)DG,Shyp(n)DG,Slin(n)DG,Sfin(n)ΦG,S(n).\mathcal{D}_{G,S}^{sof}(n)\simeq \mathcal{D}_{G,S}^{hyp}(n)\simeq \mathcal{D}_{G,S}^{lin}(n)\simeq \mathcal{D}_{G,S}^{fin}(n)\simeq \Phi_{G,S}(n).

This is presented as an ambitious generalization of the corresponding examples for virtually abelian and Heisenberg groups. The weakly sofic part is framed as an open direction, and no resolution is supplied.

Sources & referencesView supporting material

Primary source

Goulnara Arzhantseva and Pierre-Alain Cherix, “Quantifying metric approximations of discrete groups”, arXiv:2008.12954 (2020).

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