Quantified asymptotic Euclideanity conjecture for RCD spaces

Let (X,d,m)(X,d,m) be an RCD(0,N)\mathrm{RCD}(0,N) space, let pXp\in X, and let h1+δ(X,p)=kh_{1+\delta}(X,p)=k with kNk\leq N. For ϵ>0\epsilon>0 and N1N\geq 1, consider the parameter δ(N,ϵ)>0\delta(N,\epsilon)>0.

Quantified asymptotic Euclideanity conjecture. There exists δ(N,ϵ)>0\delta(N,\epsilon)>0 such that, for every δ(0,δ(N,ϵ)]\delta\in(0,\delta(N,\epsilon)], there exists R01R_0\geq 1 for which BR(p)B_R(p) is (ϵ,k)(\epsilon,k)-Euclidean for every RR0R\geq R_0.

This is presented as a quantified version of the splitting-at-infinity result and extends the preceding proposition from complete manifolds with non-negative sectional curvature to non-negatively curved Alexandrov and, conjecturally, RCD\mathrm{RCD} spaces. The source does not provide a resolution of the conjecture.

Sources & referencesView supporting material

Primary source

Hongzhi Huang and Xian-Tao Huang, “Almost splitting maps, transformation theorems and smooth fibration theorems”, arXiv:2207.10029 (2024).

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