Gromov's conjecture on convergence of almost nonnegatively scalar-flat tori

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Let Mj=(Tn,gj)M_j=(\mathbb{T}^n,g_j), with n≥3n\geq 3, be a sequence of Riemannian manifolds, where RgjR_{g_j} denotes the scalar curvature. Assume

Rgj≥−1j,V0≤Vol⁡(Mj)≤V0,Diam⁡(Mj)≤D0.R_{g_j}\geq -\frac{1}{j},\qquad V_0\leq \operatorname{Vol}(M_j)\leq V^0,\qquad \operatorname{Diam}(M_j)\leq D_0.

Gromov's conjecture. If no bubbling occurs along the sequence, or if the bubbles forming along the sequence can be cut out, then a subsequence of MjM_j converges in some sense to the flat torus.

The conjecture concerns compactness and convergence for sequences of metrics on tori whose scalar curvature approaches nonnegativity while volume and diameter remain uniformly controlled. The precise meaning of convergence and the treatment of bubbling are the issues left open in the stated formulation.

References

Primary source

Brian Allen and Edward Bryden, “Sobolev Inequalities and Convergence For Riemannian Metrics and Distance Functions”, arXiv:2112.05105 (2023).

Additional references

2 papers in this index state this conjecture (2020–2021). The statement above is taken from the most recent of them; the others are arXiv:2010.06008.

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