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arXiv 2008.10173math.PR
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图子粒子系统的平稳性和时间一致收敛性

Stationarity and uniform in time convergence for the graphon particle system

Erhan Bayraktar, Ruoyu Wu

摘要:

研究了非均匀相互作用扩散粒子系统的长时间行为及其大粒子数极限。的相互作用是平均场类型的权重,其特征在于由一个底层graphon。该极限由独立但异质的非线性扩散组成,其概率分布是完全耦合的graphon粒子系统给出。在适当的假设下,包括一定的凸性条件,我们证明了两个系统的指数遍历性,建立了随着粒子数量增加的边缘分布的时间一致大数定律,并引入了时间一致欧拉近似。给出了欧拉近似的精确收敛速率。

英文摘要:

We consider the long time behavior of heterogeneously interacting diffusive particle systems and their large population limit. The interaction is of mean field type with weights characterized by an underlying graphon. The limit is given by a graphon particle system consisting of independent but heterogeneous nonlinear diffusions whose probability distributions are fully coupled. Under suitable assumptions, including a certain convexity condition, we show the exponential ergodicity for both systems, establish the uniform-in-time law of large numbers for marginal distributions as the number of particles increases, and introduce the uniform-in-time Euler approximation. The precise rate of convergence of the Euler approximation is provided.

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