Volume 115, Number 5, September 2016
|Number of page(s)||7|
|Section||Electromagnetism, Optics, Acoustics, Heat Transfer, Classical Mechanics, and Fluid Dynamics|
|Published online||07 October 2016|
Exact correlations in a single-file system with a driven tracer
1 International center for theoretical sciences, TIFR - Bangalore-560012, India
2 Department of Physics of Complex Systems, Weizmann Institute of Science - Rehovot 76100, Israel
Received: 10 August 2016
Accepted: 15 September 2016
We study the effect of a single driven tracer particle in a bath of other particles performing the random average process on an infinite line using a stochastic hydrodynamics approach. We consider arbitrary fixed as well as random initial conditions and compute the two-point correlations. For quenched uniform and annealed steady-state initial conditions we show that in the large time T limit the fluctuations and the correlations of the positions of the particles grow subdiffusively as and have well-defined scaling forms under proper rescaling of the labels. We compute the corresponding scaling functions exactly for these specific initial configurations and verify them numerically. We also consider a non-translationally invariant initial condition with linearly increasing gaps where we show that the fluctuations and correlations grow superdiffusively as at large times.
PACS: 47.60.-i – Flow phenomena in quasi-one-dimensional systems / 05.60.Cd – Classical transport / 02.50.Ey – Stochastic processes
© EPLA, 2016
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