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arXiv · 2607.23906

Weak stability and random mean-field limit of the phase-spatially extended kinetic Cucker-Smale model

Seung-Yeal Ha·Xinyu Wang
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Abstract

We study the weak stability of the kinetic Cucker-Smale (in short, KCS) model in a phase-spatially extended setting, which can be formally derived from the infinite Cucker-Smale model in the mean-field limit. For a bounded Lipschitz communication weight function, we derive finite-time Osgood-type weak stability for measure-valued solutions with exponential velocity tails and finite spatial second moments. Unlike the phase-spatially confined setting, the solution operator to the KCS model is not Lipschitz continuous with respect to initial data. This is due to the unbounded velocity tail and the corresponding absence of a uniform Lipschitz bound for the alignment force. As an application of weak stability, we obtain an i.i.d. sampling consequence: empirical measures generated from independent initial samples converge to the measure-value solution for the corresponding kinetic model in any finite time interval, in expectation.

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Seung-Yeal Ha, Xinyu Wang. 2026-07-27. Weak stability and random mean-field limit of the phase-spatially extended kinetic Cucker-Smale model. https://arxiv.org/abs/2607.23906

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