Torsion Singer conjecture for homology growth

Let MnM^n be a closed aspherical nn-manifold with residually finite fundamental group, and set G=π1(Mn)G=\pi_1(M^n). Let GkGG_k\mathrel{\lhd}G be any normal chain of finite-index subgroups satisfying kGk=1\bigcap_kG_k=1. Write logtorHi(Gk;Z)\operatorname{logtor}H_i(G_k;\mathbb Z) for the logarithm of the order of the torsion subgroup of Hi(Gk;Z)H_i(G_k;\mathbb Z). Torsion Singer conjecture. If i(n1)/2i\ne(n-1)/2, then

lim supklogtorHi(Gk;Z)[G:Gk]=0.\limsup_k\frac{\operatorname{logtor}H_i(G_k;\mathbb Z)}{[G:G_k]}=0.

This is a torsion-homology-growth analogue of Singer's conjecture for residually finite closed aspherical manifolds. The statement is presented as a motivation for the paper's results, and no resolution is supplied here.

Sources & referencesView supporting material

Primary source

Grigori Avramidi, Boris Okun and Kevin Schreve, “Edge subdivisions and the L^2-homology of right-angled Coxeter groups”, arXiv:2411.08009 (2024).

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