Guth's normalized volume conjecture for uniform hyperbolic ball comparison

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For a closed oriented connected nn-dimensional manifold MM admitting a hyperbolic metric, let gg be a Riemannian metric on MM, let ∥M∥Δ\|M\|_{\Delta} denote its Gromov simplicial volume, and write (M~,g~)(\widetilde M,\widetilde g) for the universal cover with the lifted metric. Let Vr(X,h)V_r(X,h) be the supremum of the hh-volumes of radius-rr balls in (X,h)(X,h). Guth's normalized volume conjecture. For every n≥2n\ge2, there exists δn>0\delta_n>0 such that, if

Vol⁡g(M)∥M∥Δ<δn,\frac{\operatorname{Vol}_g(M)}{\|M\|_{\Delta}}<\delta_n,

then

Vr(M~,g~)≥Vr(Hn)V_r(\widetilde M,\widetilde g)\ge V_r(\mathbb{H}^n)

for every r≥1r\ge1. This is an intermediate scale-uniform statement combining the covering-invariant hypothesis of Guth's fixed-scale theorem with the all-scale conclusion of Sabourau's theorem; its general validity remains open.

References

Primary source

Heng Zhang, “Uniform Comparison of Hyperbolic Ball Volumes on the Universal Cover”, arXiv:2607.10424 (2026).

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