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arXiv 0909.0235physics.plasm-phphysics.class-ph
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二维Yukawa液体中的扩散是反常的吗?

Is diffusion anomalous in two-dimensional Yukawa liquids?

T. Ott, M. Bonitz

摘要:

最近有许多预测的“超扩散”在二维强耦合汤川系统,无论是通过计算机模拟和尘埃等离子体实验,与实质上不同的扩散指数。在这里,我们表明,结果主要取决于耗散的强度和测量的时刻。对于足够大的摩擦,甚至亚扩散也是可能的。然而,有强烈的迹象表明,在长时间限制内,对于耗散系统和无摩擦系统,异常扩散消失。

英文摘要:

There have recently been many predictions of "superdiffusion" in two-dimensional strongly coupled Yukawa systems, both by computer simulations and in dusty plasma experiments, with substantially varying diffusion exponents. Here we show that the results crucially depend on the strength of dissipation and the time instant of the measurement. For sufficiently large friction even subdiffusion is possible. However, there are strong indications that, in the long-time limit, anomalous diffusion vanishes for dissipative as well as for frictionless systems.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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