Hyperbolic torsion approximation conjecture for finite-volume 3-manifolds

Let YY be a finite-volume hyperbolic 33-manifold, and let Y_n_{n\in \mathbb{N}} be a nested collection of finite covers such that

nNπ1(Yn)π1(Y)\bigcap\limits_{n\in \mathbb{N}}\pi_1(Y_n)\subset \pi_1(Y)

is trivial. Here τ(Yn,αcan)\tau(Y_n,\alpha_{can}) denotes the torsion associated with the canonical discrete faithful SL(2,C)\operatorname{SL}(2,\mathbb{C}) representation. Hyperbolic torsion approximation conjecture. There exists a constant C>0C>0, independent of YY, such that

limn1[Y:Yn]lnτ(Yn,αcan)=Cvol(Y).\lim_{n\to\infty}\frac{1}{[Y:Y_n]}\ln\left|\tau(Y_n,\alpha_{can})\right|=-C\cdot\operatorname{vol}(Y).

The question is whether the torsion limit known for closed hyperbolic 33-manifolds extends to finite-volume hyperbolic 33-manifolds with toroidal boundary, with a universal proportionality constant.

Sources & referencesView supporting material

Primary source

Stefan Friedl and Nicholas Jackson, “Approximations to the volume of hyperbolic knots”, arXiv:1102.3742 (2011).

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