Suppression of thermal noise in a non-Markovian random velocity field
Suppression of thermal noise in a non-Markovian random velocity field
复制标题
非马尔可夫随机速度场中热噪声的抑制
DOI：
10.1088/1742-5468/2016/02/023206
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发表时间：
2016
期刊：
影响因子：
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通讯作者：
Masahiko Ueda
中科院分区：
文献类型：
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作者：
嵯峨承平;山内大介;市來淨與;嵯峨承平;嵯峨承平;嵯峨承平;嵯峨承平;嵯峨承平;嵯峨承平;Shohei Saga;嵯峨承平;Shohei Saga;嵯峨承平;Shohei Saga;Shohei Saga;Shohei Saga;Hiroyuki Hirayama and Mamoru Okamoto;Hiroyuki Hirayama and Mamoru Okamoto;Hiroyuki Hirayama;Hiroyuki Hirayama;Hiroyuki Hirayama;平山 浩之;平山 浩之;平山 浩之;平山 浩之;平山 浩之;平山 浩之;平山 浩之;Hiroyuki Hirayama;平山 浩之;平山 浩之;平山 浩之;Masahiko Ueda
我们研究了布朗粒子在短记忆高斯随机速度场中的扩散。通过将含有弱色噪声的朗维金方程的有效Fokker-Planck方程的推导推广到随机速度场问题，我们发现热噪声对粒子的影响被记忆的存在所抑制。我们还发现，两粒子相对扩散的重整化效应比单粒子扩散的重整化效应强。将计算结果与分子动力学模拟结果进行了比较。
We study the diffusion of Brownian particles in a Gaussian random velocity field with short memory. By extending the derivation of an effective Fokker–Planck equation for the Lanvegin equation with weakly colored noise to a random velocity-field problem, we find that the effect of thermal noise on particles is suppressed by the existence of memory. We also find that the renormalization effect for the relative diffusion of two particles is stronger than that for single-particle diffusion. The results are compared with those of molecular dynamics simulations.