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arXiv 1606.06330math.PRmath-phmath.MP
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一维Kac粒子系统混沌的均匀传播

Uniform propagation of chaos for Kac's 1D particle system

Roberto Cortez

摘要:

本文研究了由$N$粒子以恒定速率碰撞并随机交换能量的速度组成的Kac一维粒子系统。我们证明了在$N$中具有显式多项式速率的Wasserstein距离中混沌的均匀(在时间上)传播,对于平方(即,能量)和非平方粒子系统。假设极限非线性方程的初始分布具有足够高阶的有限矩(当使用2-Wasserstein距离时,$4+ε$就足够了),则这些速率的阶数为$N^{-1/3}$(在非平方的情况下几乎是)。证明依赖于一个方便的参数化的碰撞最近推出的豪雷,以及由科尔特斯和Fontbona开发的耦合技术。

英文摘要:

In this paper we study Kac's 1D particle system, consisting of the velocities of $N$ particles colliding at constant rate and randomly exchanging energies. We prove uniform (in time) propagation of chaos in Wasserstein distance with explicit polynomial rates in $N$, for both the squared (i.e., the energy) and non-squared particle system. These rates are of order $N^{-1/3}$ (almost, in the non-squared case), assuming that the initial distribution of the limit nonlinear equation has finite moments of sufficiently high order ($4+ε$ is enough when using the 2-Wasserstein distance). The proof relies on a convenient parametrization of the collision recently introduced by Hauray, as well as on a coupling technique developed by Cortez and Fontbona.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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