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arXiv 1701.05079cond-mat.stat-mech
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Einstein关系与非平衡质量输运过程的流体力学

Einstein relation and hydrodynamics of nonequilibrium mass transport processes

Arghya Das, Anupam Kundu, Punyabrata Pradhan

摘要:

我们得到流体动力学描述的一类广泛的守恒质量传输过程的环。这些过程是由碎片,扩散和合并的质量,微观概率权重在其非平衡稳态,具有非平凡的相关性,是未知的。在这些过程中,我们解析计算两个传输系数,体扩散系数和电导率。值得注意的是,我们发现,虽然微观动力学不满足细致平衡条件,但两个输运系数服从类平衡爱因斯坦关系。使用宏观涨落理论,我们还表明,从流体动力学描述中获得的密度涨落概率与先前在[Phys. Rev. E 93,062135(2016)]中使用可加性性质得出的结果完全一致。

英文摘要:

We obtain hydrodynamic descriptions of a broad class of conserved-mass transport processes on a ring. These processes are governed by chipping, diffusion and coalescence of masses, where microscopic probability weights in their nonequilibrium steady states, having nontrivial correlations, are not known. In these processes, we analytically calculate two transport coefficients, the bulk-diffusion coefficient and the conductivity. We, remarkably, find that the two transport coefficients obey an equilibriumlike Einstein relation, although the microscopic dynamics does not satisfy detailed balance condition. Using macroscopic fluctuation theory, we also show that probability of density fluctuations obtained from the hydrodynamic description is in complete agreement with the same derived earlier in [Phys. Rev. E 93, 062135 (2016)] using an additivity property.

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