Fluctuations of the heat flux of a one-dimensional hard particle gas

Details Fluctuations of the heat flux of a one-dimensional hard particle gas Fluctuations of the heat flux of a one-dimensional hard particle gas

2010-02-18

arxiv.org/abs/1002.3545v1

Physics

Condensed Matter

Statistical Mechanics

5 figures

Scientific paper

Momentum-conserving one-dimensional models are known to exhibit anomalous Fourier's law, with a thermal conductivity varying as a power law of the system size. Here we measure, by numerical simulations, several cumulants of the heat flux of a one-dimensional hard particle gas. We find that the cumulants, like the conductivity, vary as power laws of the system size. Our results also indicate that cumulants higher than the second follow different power laws when one compares the ring geometry at equilibrium and the linear case in contact with two heat baths (at equal or unequal temperatures). keywords: current fluctuations, anomalous Fourier law, hard particle gas

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