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arXiv 2102.07128math.PRmath-phmath.MP
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具有自排斥的分支布朗运动

Branching Brownian motion with self repulsion

Anton Bovier, Lisa Hartung

摘要:

考虑一类具有自排斥的分枝布朗运动模型。通过改变测量值来引入自排斥,该测量值惩罚在彼此的$\e$邻域中花费时间的粒子。我们得到一个简化版本的模型,只有分支事件受到惩罚。这个模型几乎是完全可解的,我们得到一个精确的描述的粒子数和分支时间。在弱罚的极限下,一个有趣的泛时非齐次分支过程出现了。最大值的位置由具有不定常反应项的F-KPP型反应扩散方程决定。

英文摘要:

We consider a model of branching Brownian motion with self repulsion. Self-repulsion is introduced via change of measure that penalises particles spending time in an $\e$-neighbourhood of each other. We derive a simplified version of the model where only branching events are penalised. This model is almost exactly solvable and we derive a precise description of the particle numbers and branching times. In the limit of weak penalty, an interesting universal time-inhomogeneous branching process emerges. The position of the maximum is governed by a F-KPP type reaction-diffusion equation with a time dependent reaction term.

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