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arXiv 2112.04437math.AP
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重尾通信下Cucker-Smale系统的混沌传播

Propagation of Chaos for the Cucker-Smale Systems under heavy tail communication

Vinh Nguyen, Roman Shvydkoy

摘要:

本文研究了经典离散Cucker-Smale系统Liouville方程解的混沌传播。假设通信内核满足重尾条件-已知是必要的,以诱导指数对齐-我们得到一个线性的时间收敛速度的$k$ -th边缘$f^{(k)}$的产品的$k$解决方案的相应的Vlasov对齐方程,$f^{\otimes k}$。具体而言,以下估计在Wasserstein-2度量\begin{equation}\label{e:abst} \mathcal{W}_2(f^{(k)}_t,f^{\otimes k}_t) \leq C k^{1/2} \min\left\{ 1, \frac{t}{\sqrt{N}} \right\}. \end{equation}方面成立。对于具有瑞利型摩擦力和自推进力的系统,我们对扇形解获得了类似的结果。已知这样的解经由格拉斯曼约化方法\cite{LRS-friction}以指数方式快速对准。我们在动力学设置中重新设计了该方法,并表明结合的\eqref{e:abst}仍然存在,但与时间呈二次依赖关系。在无外力和有外力两种情况下,结果都比Natalini和Paul在早期工作\cite{NP2021-orig}中建立的指数界限有所改进,尽管这些界限适用于一般内核。我们工作的主要信息是,群集动力学大大提高了速率。

英文摘要:

In this work we study propagation of chaos for solutions of the Liouville equation for the classical discrete Cucker-Smale system. Assuming that the communication kernel satisfies the heavy tail condition -- known to be necessary to induce exponential alignment -- we obtain a linear in time convergence rate of the $k$-th marginals $f^{(k)}$ to the product of $k$ solutions of the corresponding Vlasov-Alignment equation, $f^{\otimes k}$. Specifically, the following estimate holds in terms of Wasserstein-2 metric \begin{equation}\label{e:abst} \mathcal{W}_2(f^{(k)}_t,f^{\otimes k}_t) \leq C k^{1/2} \min\left\{ 1, \frac{t}{\sqrt{N}} \right\}. \end{equation} For systems with the Rayleigh-type friction and self-propulsion force, we obtain a similar result for sectorial solutions. Such solutions are known to align exponentially fast via the method of Grassmannian reduction, \cite{LRS-friction}. We recast the method in the kinetic settings and show that the bound \eqref{e:abst} persists but with the quadratic dependence on time. In both the forceless and forced cases, the result represents an improvement over the exponential bounds established earlier in the work of Natalini and Paul, \cite{NP2021-orig}, although those bounds hold for general kernels. The main message of our work is that flocking dynamics improves the rate considerably.

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