Sormani's scalar curvature conjecture for intrinsic flat limits

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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

Scalj≥0,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 M∞M_\infty, written Mj⟶FM∞M_j\stackrel{\mathcal{F}}{\longrightarrow}M_\infty. For p∈M∞p\in M_\infty, let B(p,r)B(p,r) be the metric ball in the limit space, let Vol⁡Y\operatorname{Vol}_{Y} denote its volume, and let Vol⁡E3(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 p∈M∞p\in M_\infty,

lim⁡r→0Vol⁡E3(B(0,r))−Vol⁡Y(B(p,r))r2Vol⁡E3(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.

References

Primary source

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

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