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Heat conduction in a one-dimensional gas of elastically colliding particles of unequal masses

Abhishek Dhar
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Abstract

We study the nonequlibrium state of heat conduction in a one-dimensional system of hard point particles of unequal masses interacting through elastic collisions. A BBGKY-type formulation is presented and some exact results are obtained from it. Extensive numerical simulations for the two-mass problem indicate that even for arbitrarily small mass differences, a nontrivial steady state is obtained. This state exhibits local thermal equilibrium and has a temperature profile in accordance with the predictions of kinetic theory. The temperature jumps typically seen in such studies are shown to be finite-size effects. The thermal conductivity appears to have a very slow divergence with system size, different from that seen in most other systems.

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Abhishek Dhar. 2001-02-12. Heat conduction in a one-dimensional gas of elastically colliding particles of unequal masses. https://doi.org/10.1103/physrevlett.86.3554

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