Collapsed pseudo-locality conjecture with scalar-curvature control

Let α(0,1)\alpha\in(0,1). There should exist positive constants δ=δ(m,α)\delta=\delta(m,\alpha) and ε=ε(m,α)\varepsilon=\varepsilon(m,\alpha) such that, if (M,g(t))t[0,T](M,g(t))_{t\in[0,T]} is an mm-dimensional Ricci flow with complete time slices and, for some pMp\in M,

supBg(0)(p,1)Rmg(0)g(0)1,dGH(Bg(0)(p,1),Bk(1))δ,supM×[0,T]Scg(t)1,\sup_{B_{g(0)}(p,1)}|\operatorname{Rm}_{g(0)}|_{g(0)}\leq 1,\qquad d_{\rm GH}\bigl(B_{g(0)}(p,1),\mathbb B^k(1)\bigr)\leq\delta,\qquad \sup_{M\times[0,T]}|\operatorname{Sc}_{g(t)}|\leq 1,

then for every t[0,ε2]t\in[0,\varepsilon^2],

supBg(t)(p,ε)Rmg(t)g(t)αt1+ε2.\sup_{B_{g(t)}(p,\varepsilon)}|\operatorname{Rm}_{g(t)}|_{g(t)}\leq \alpha t^{-1}+\varepsilon^{-2}.

Collapsed pseudo-locality conjecture. The asserted curvature estimate should hold even when the initial unit ball is Gromov--Hausdorff close to a lower-dimensional Euclidean ball. This would provide a pseudo-locality principle compatible with collapse, beyond the usual noncollapsing hypotheses; examples cited in the source show that simply deleting all local volume assumptions without scalar-curvature control cannot work.

Sources & referencesView supporting material

Primary source

Shaosai Huang, Xiaochun Rong and Bing Wang, “Collapsing geometry with Ricci curvature bounded below and Ricci flow smoothing”, arXiv:2008.12419 (2020).

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