Preprint

Inserted: 15 oct 2026
Last Updated: 15 oct 2026

Year: 2026

Abstract:

The squared Wasserstein distance with respect to a fixed target measure is not a convex function along Wasserstein geodesics over $\mathbb{R}^d$ when $d\geq 2$. Still, in dimension $d=1$, this function is $2$-geodesically convex. We prove that the square of the sliced-Wasserstein distance (which is a distance constructed averaging one-dimensional Wasserstein distances) is $\lambda$-geodesically convex (possibly with $\lambda \leq 0$) on sets of measures satisfying upper bounds on their density, when the target measure satisfies some given geometric conditions. We also present some consequences of this result in the study of the sliced-Wasserstein flow.

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• CozSan_SWLambdaGeo.pdf