Langevin formulation for single-file diffusion
Abstract
We introduce a stochastic equation for the microscopic motion of a tagged particle in the single file model. This equation provides a compact representation of several of the system's properties such as Fluctuation-Dissipation and Linear Response relations, achieved by means of a diffusion noise approach. Most important, the proposed Langevin Equation reproduces quantitatively the three temporal regimes and the corresponding time scales: ballistic, diffusive and subdiffusive.
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