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arXiv 1812.03549cond-mat.stat-mechnlin.PS
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具有反常输运的反应扩散系统中的随机涨落和拟斑图形成

Stochastic fluctuations and quasi-pattern formation in reaction-diffusion systems with anomalous transport

Joseph W. Baron, Tobias Galla

摘要:

许多方法来模拟具有反常输运的反应扩散系统依赖于确定性方程,而忽略了由于有限粒子数而产生的波动。从一个基于个人的模型,我们使用生成函数的方法来推导出高斯近似的subdiffusive系统中的本征噪声。这导致确定性分数阶反应扩散方程的修正。利用这种分析方法,我们研究了反应亚扩散系统中噪声驱动的拟斑图的发生。我们发现,子扩散可以有利于确定性和随机模式的形成。我们的分析表明,子扩散和内在随机性的组合可以降低有效扩散系数的阈值比所需的斑图形成到一个更大的程度比其本身的效果。

英文摘要:

Many approaches to modelling reaction-diffusion systems with anomalous transport rely on deterministic equations and ignore fluctuations arising due to finite particle numbers. Starting from an individual-based model we use a generating-functional approach to derive a Gaussian approximation for this intrinsic noise in subdiffusive systems. This results in corrections to the deterministic fractional reaction-diffusion equations. Using this analytical approach, we study the onset of noise-driven quasi-patterns in reaction-subdiffusion systems. We find that subdiffusion can be conducive to the formation of both deterministic and stochastic patterns. Our analysis shows that the combination of subdiffusion and intrinsic stochasticity can reduce the threshold ratio of the effective diffusion coefficients required for pattern formation to a greater degree than either effect on its own.

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