Wave Propagation for Reaction-Diffusion Equations on Infinite Random Trees
Wave Propagation for Reaction-Diffusion Equations on Infinite Random Trees
复制标题
无限随机树上反应扩散方程的波传播
DOI:
10.1007/s00220-021-04085-z
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发表时间:
2021
影响因子:
2.4
通讯作者:
Terlov, Grigory
中科院分区:
文献类型:
--
作者:
Fan, Wai-Tong Louis;Hu, Wenqing;Terlov, Grigory
The asymptotic wave speed for FKPP type reaction-diffusion equations on a class of infinite random metric trees are considered. We show that a travelling wavefront emerges, provided that the reaction rate is large enough. The wavefront travels at a speed that can be quantified via a variational formula involving the random branching degreesand the random branch lengthsof the tree. This speed isslower thanthat of the same equation on the real line, and we estimate this slow down in terms ofand. The key idea is to project the Brownian motion on the tree onto a one-dimensional axis along the direction of the wave propagation. The projected process is a multi-skewed Brownian motion, introduced by Ramirez [31], with skewness and interface sets that encode the metric structureof the tree. Combined with analytic arguments based on the Feynman-Kac formula, this idea connects our analysis of the wavefront propagation to the large deviations principle (LDP) of the multi-skewed Brownian motion with random skewness and random interface set. Our LDP analysis involves delicate estimates for an infinite product ofrandom matrices parametrized byandand for hitting times of a random walk in random environment.
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