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arXiv 2101.01031math.PR
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局部相互作用布朗粒子的标度极限--KPP方程

The KPP equation as a scaling limit of locally interacting Brownian particles

Franco Flandoli, Ruojun Huang

摘要:

证明了Fisher-KPP方程是具有局域相互作用的布朗粒子系统的标度极限。粒子的增殖和死亡取决于其他粒子的局部浓度。相对于离散模型,控制粒子的浓度是布朗粒子相互作用的一个主要困难;局部相互作用而不是平均场或温和的,使得它更难以实现大数定律的性质。这里所采取的克服这些困难的方法很大程度上受到了A. Hammond和F. Rezakhanlou [10]在平均自由程情况下实现,而不是局部相互作用机制。

英文摘要:

Fisher-KPP equation is proved to be the scaling limit of a system of Brownian particles with local interaction. Particles proliferate and die depending on the local concentration of other particles. Opposite to discrete models, controlling concentration of particles is a major difficulty in Brownian particle interaction; local interactions instead of mean field or moderate ones makes it more difficult to implement the law of large numbers properties. The approach taken here to overcome these difficulties is largely inspired by A. Hammond and F. Rezakhanlou [10] implemented there in the mean free path case instead of the local interaction regime.

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