Guth's macroscopic Schoen conjecture for hyperbolic manifolds

Let MM be a closed hyperbolic manifold, let gg be an auxiliary Riemannian metric on MM, and let Vhyp(R)V_{hyp}(R) denote the volume of a geodesic ball of radius RR in hyperbolic space. Write M~\widetilde{M} for the universal cover, equipped with the lifted metric g~\widetilde{g}, and let B~(y,R)M~\widetilde{B}(y,R)\subset\widetilde{M} be the metric ball of radius RR centered at yy. Its Riemannian volume is denoted by B~(y,R)|\widetilde{B}(y,R)|. Guth's conjecture. If

vol(M,g)<vol(M,hyp),\operatorname{vol}(M,g)<\operatorname{vol}(M,hyp),

then for every radius R>0R>0,

maxyM~B~(y,R)>Vhyp(R).\max_{y\in\widetilde{M}}|\widetilde{B}(y,R)|>V_{hyp}(R).

This is a macroscopic version of a conjecture of R. Schoen concerning scalar curvature. Guth proved the assertion for radius R=1R=1 under the stronger hypothesis that the volume is sufficiently small compared with the hyperbolic volume; the conjecture asks for all positive radii under the stated volume hypothesis.

Sources & referencesView supporting material

Primary source

Florent Balacheff and Steve Karam, “Macroscopic Schoen conjecture for manifolds with non-zero simplicial volume”, arXiv:1709.10049 (2018).

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