Local volume-growth conjecture for quasi-optimal pseudomanifolds

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Let (Pn)(P_n) be a sequence of quasi-optimal pseudomanifolds representing multiples of a homology class, equipped with the piecewise-flat metric in which every mm-simplex is isometric to the standard simplex. Let φn:π1(Pn)→π1(X)\varphi_n:\pi_1(P_n)\to\pi_1(X) be the homomorphism induced by the representing map, and let sys⁡φn(Pn)\operatorname{sys}_{\varphi_n}(P_n) denote the relative systole. Local volume-growth conjecture. There exist constants cm>0c_m>0 and ε∈(0,12)\varepsilon\in(0,\frac12) such that, for every x∈Pnx\in P_n and every r>0r>0 satisfying

ε sys⁡φn(Pn)⩽r⩽12 sys⁡φn(Pn),\varepsilon\,\operatorname{sys}_{\varphi_n}(P_n)\leqslant r\leqslant\frac12\,\operatorname{sys}_{\varphi_n}(P_n),

one has

vol⁡B(x,r)⩾cmrm.\operatorname{vol} B(x,r)\geqslant c_m r^m.

This is suggested by Gromov's property for almost volume-minimizing cycles in systolic geometry, although here the volume being considered is that of pseudomanifolds constructed from the standard simplex. The statement is presented as a possible route to controlling relative entropy and is not accompanied by evidence of resolution.

References

Primary source

Ivan Babenko and Stephane Sabourau, “Volume entropy semi-norm”, arXiv:1909.10803 (2019).

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