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arXiv · 2209.04268

Absolutely continuous and BV-curves in 1-Wasserstein spaces

Ehsan Abedi·Zhenhao Li·Timo Schultz
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Abstract

We extend the result of Lisini (Calc Var Partial Differ Equ 28:85-120, 2007) on the superposition principle for absolutely continuous curves in $p$-Wasserstein spaces to the special case of $p=1$. In contrast to the case of $p>1$, it is not always possible to have lifts on absolutely continuous curves. Therefore, one needs to relax the notion of a lift by considering curves of bounded variation, or shortly BV-curves, and replace the metric speed by the total variation measure. We prove that any BV-curve in a 1-Wasserstein space can be represented by a probability measure on the space of BV-curves which encodes the total variation measure of the Wasserstein curve. In particular, when the curve is absolutely continuous, the result gives a lift concentrated on BV-curves which also characterizes the metric speed. The main theorem is then applied for the characterization of geodesics and the study of the continuity equation in a discrete setting.

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Ehsan Abedi, Zhenhao Li, Timo Schultz. 2022-09-09. Absolutely continuous and BV-curves in 1-Wasserstein spaces. https://doi.org/10.1007/s00526-023-02616-1

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