Gromov's average area ratio conjecture for hyperbolic manifolds

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Let (M,h0)(M,h_0) be a closed hyperbolic manifold of dimension n≥3n\geq 3, and let NN be a closed nn-manifold with Riemannian metric gg whose scalar curvature satisfies Rg≥−n(n−1)R_g\geq -n(n-1). Let F:N→MF:N\to M be a smooth map of degree dd. Gromov's conjecture. The average area ratio satisfies

Area⁡F(g/h0)≥d.\operatorname{Area}_F(g/h_0)\geq d.

Moreover, equality holds if and only if FF is a local isometry. This conjecture strengthens Gromov's known lower bound in dimension three from d/3d/3 to dd and proposes the analogous sharp inequality in every dimension n≥3n\geq 3; the supplied context does not state whether it has been resolved.

References

Primary source

Ruojing Jiang, “Average area ratio and normalized total scalar curvature of hyperbolic n-manifolds”, arXiv:2210.01333 (2022).

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