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arXiv 1605.08970cond-mat.stat-mechphysics.comp-ph
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赫兹链在平衡状态下的涨落

Fluctuations in Hertz chains at equilibrium

Michelle Przedborski, Surajit Sen, Thad A. Harroun

摘要:

我们研究的长期行为的不可积的,能量守恒的,1D系统的宏观颗粒通过接触的广义赫兹势相互作用,并保持固定的墙壁之间。现有的动力学研究表明,在这种系统中没有能量均分,因此它们的长期动力学被描述为准平衡。在这里,我们表明这些系统实际上确实在足够长的时间内达到热平衡,正如计算出的热容量所表明的那样。作为一个副产品,我们展示了如何波动的系统数量,从而分布函数,受到赫兹势。特别地,系统的动能概率密度函数的方差通过与接触电势相关的因子减小。

英文摘要:

We examine the long-term behaviour of non-integrable, energy-conserved, 1D systems of macroscopic grains interacting via a contact-only generalized Hertz potential and held between stationary walls. Existing dynamical studies showed the absence of energy equipartitioning in such systems, hence their long-term dynamics was described as quasi-equilibrium. Here we show that these systems do in fact reach thermal equilibrium at sufficiently long times, as indicated by the calculated heat capacity. As a byproduct, we show how fluctuations of system quantities, and thus the distribution functions, are influenced by the Hertz potential. In particular, the variance of the system's kinetic energy probability density function is reduced by a factor related to the contact potential.

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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