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arXiv 2203.05459cond-mat.stat-mechcond-mat.soft
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关于活化池中迁移率与扩散系数的爱因斯坦关系

On the Einstein relation between mobility and diffusion coefficient in an active bath

Alexandre Solon, Jordan M. Horowitz

摘要:

由自推进单元组成的活性浴是一种非平衡介质,其中示踪粒子的迁移率$μ$和扩散率$D$之间的爱因斯坦关系$D=μk_B T$不能被期望先验地保持。我们在这里考虑重示踪剂,这些系数可以与关联函数,我们估计。我们表明,一个很好的近似,爱因斯坦关系并不持有在一个活跃的浴时,使用不同的温度,这是机械定义的,通过施加在示踪剂上的压力。

英文摘要:

An active bath, made of self-propelling units, is a nonequilibrium medium in which the Einstein relation $D=μk_B T$ between the mobility $μ$ and the diffusivity $D$ of a tracer particle cannot be expected to hold a priori. We consider here heavy tracers for which these coefficients can be related to correlation functions which we estimate. We show that, to a good approximation, an Einstein relation does hold in an active bath upon using a different temperature which is defined mechanically, through the pressure exerted on the tracer.

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