Year: 2026
Type: preprint
Abstract: Caffarelli's contraction theorem states that the Brenier optimal transport map from the standard Gaussian measure to a more log-concave probability measure is $1$-Lipschitz. Motivated by this theorem, Milman [Mil18] formulated several conjectures for the round sphere and for weighted manifolds satisfying the curvature-dimension condition $\operatorname{CD}(ρ,\infty)$. A contracting transport map as in these conjectures implies a corresponding spectral comparison. In the spherical setting, this comparison was also conjectured by Colding and Minicozzi [CM98] for compact manifolds with Ricci curvature lower bounds. We construct counterexamples to these conjectured spectral comparisons on spheres in dimensions $d\geq4$ and on smooth complete weighted manifolds diffeomorphic to $\mathbb{R}^d$ satisfying the $\operatorname{CD}(1,\infty)$ condition in dimensions $d\geq4$, thereby obtaining obstructions to contracting transport maps. The spherical counterexamples can be chosen arbitrarily close to the unit round metric in $C^\infty$, while retaining $\operatorname{Ric_g}\geq(d-1)g$. The weighted counterexamples can be chosen with non-negative sectional curvature $\operatorname{Sec}_g\geq0$ when $d\geq4$. For $d\geq5$, we also construct counterexamples satisfying $\operatorname{Ric}_g\geq0$ and $\nabla_g^2V\geq g$, where $μ=Z^{-1}e^{-V}\operatorname{dvol}_g$.
Source: arXiv (Cornell University)
Author: Aryan, Shrey
Language: English
Subfield: Applied Mathematics
Field: Mathematics
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W7162468794