Sormani's scalar curvature conjecture for intrinsic flat limits

From papers

Let Mj3M_j^3 be a sequence of three-dimensional Riemannian manifolds. Write Scalj{\rm Scal}_j for the scalar curvature, Vol(Mj)\operatorname{Vol}(M_j) for their volume, and MinA(Mj)\textrm{MinA}(M_j) for the minimal area of a closed minimal surface in MjM_j. Assume

Scalj0,Vol(Mj)V0>0,MinA(Mj)A0>0.{\rm Scal}_j\ge 0,\qquad \operatorname{Vol}(M_j)\ge V_0>0,\qquad \textrm{MinA}(M_j)\ge A_0>0.

Suppose that MjM_j converges in the intrinsic flat sense to MM_\infty, written MjFMM_j\stackrel{\mathcal{F}}{\longrightarrow}M_\infty. For pMp\in M_\infty, let B(p,r)B(p,r) be the metric ball in the limit space, let VolY\operatorname{Vol}_{Y} denote its volume, and let VolE3(B(0,r))\operatorname{Vol}_{\mathbb{E}^3}(B(0,r)) denote the Euclidean volume of a radius-rr ball. Sormani's scalar curvature conjecture. At every point pMp\in M_\infty,

limr0VolE3(B(0,r))VolY(B(p,r))r2VolE3(B(0,r))0.\lim_{r\to 0}\frac{\operatorname{Vol}_{\mathbb{E}^3}(B(0,r))-\operatorname{Vol}_{Y}(B(p,r))}{r^2\operatorname{Vol}_{\mathbb{E}^3}(B(0,r))}\ge 0.

This is proposed as a possible revision of Gromov's vague conjecture, motivated by counterexamples showing that intrinsic flat and Gromov--Hausdorff limits of noncollapsing sequences with positive scalar curvature may fail to retain key properties of nonnegative scalar curvature. The statement remains open in the supplied source.

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Sources & referencesView supporting material

Primary source

J. Basilio, J. Dodziuk and C. Sormani, “Sewing Riemannian Manifolds with Positive Scalar Curvature”, arXiv:1703.00984 (2017).

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