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arXiv 1809.10656cond-mat.stat-mechcond-mat.soft
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活性物质中的无记忆非高斯噪声

Non-Gaussian noise without memory in active matter

Étienne Fodor, Hisao Hayakawa, Julien Tailleur, Frédéric van Wijland

摘要:

对单个活性粒子的动力学建模总是涉及到各向同性的噪声自推进分量,其形式是奔跑和翻滚运动或围绕它的变化。这种非平衡噪声源既不是白噪声--也不是高斯噪声--也不是持久噪声。虽然新兴的集体行为在活性物质迄今已被归因于持久的成分,我们专注于非高斯成分的自我推进。我们表明,通过本身,这是没有调用任何记忆效应,它是能够产生粒子的积累接近边界和有效的吸引力,否则排斥粒子,一般导致运动诱导的相分离的机制,在活性物质。

英文摘要:

Modeling the dynamics of an individual active particle invariably involves an isotropic noisy self-propulsion component, in the form of run-and-tumble motion or variations around it. This nonequilibrium source of noise is neither white---there is persistence---nor Gaussian. While emerging collective behavior in active matter has hitherto been attributed to the persistent ingredient, we focus on the non-Gaussian ingredient of self-propulsion. We show that by itself, that is without invoking any memory effect, it is able to generate particle accumulation close to boundaries and effective attraction between otherwise repulsive particles, a mechanism which generically leads to motility-induced phase separation in active matter.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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