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Approach to a Stationary State in an External Field

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Abstract

We study relaxation towards a stationary out-of-equilibrium state by analyzing a one-dimensional stochastic process followed by a particle accelerated by an external field and propagating through a thermal bath. The effect of collisions is described within one-dimensional formulation of Boltzmann’s kinetic theory. We present analytical solutions for the Maxwell gas and for the very hard particle model. The exponentially fast relaxation of the velocity distribution towards the stationary form is demonstrated. In the reference frame moving with constant drift velocity the hydrodynamic diffusive mode is shown to govern the distribution in the position space. We show that the exact value of the diffusion coefficient for any value of the field is correctly predicted by the Green-Kubo autocorrelation formula generalized to the stationary state.

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Correspondence to A. Alastuey.

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Alastuey, A., Piasecki, J. Approach to a Stationary State in an External Field. J Stat Phys 139, 991–1012 (2010). https://doi.org/10.1007/s10955-010-9976-x

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  • DOI: https://doi.org/10.1007/s10955-010-9976-x

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