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arXiv 1901.00153cond-mat.stat-mech
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相互作用扩散粒子气体的占据时间统计

Occupation time statistics of a gas of interacting diffusing particles

Tal Agranov, P. L. Krapivsky, Baruch Meerson

摘要:

扩散粒子在空间的某一区域内所花费的时间称为占据时间或停留时间。最近,非相互作用粒子系综的联合占据时间统计是用单粒子统计来处理的。本文采用宏观涨落理论(MacroscopicFluctuationTheory,MFT)研究了多个\emph{interacting}粒子的占据时间统计。我们发现,相互作用可以显着改变统计,在某些模型中,甚至会导致奇异的大偏差函数描述这些统计。这种奇异性可以解释为一个动态的相变。我们还指出了一个密切的关系之间的MFT描述的非相互作用粒子的占据时间统计和2级大偏差形式主义,它描述了一个单一的粒子的占据时间统计。

英文摘要:

The time which a diffusing particle spends in a certain region of space is known as the occupation time, or the residence time. Recently the joint occupation time statistics of an ensemble of non-interacting particles was addressed using the single-particle statistics. Here we employ the Macroscopic Fluctuation Theory (MFT) to study the occupation time statistics of many \emph{interacting} particles. We find that interactions can significantly change the statistics and, in some models, even cause a singularity of the large-deviation function describing these statistics. This singularity can be interpreted as a dynamical phase transition. We also point out to a close relation between the MFT description of the occupation-time statistics of non-interacting particles and the level 2 large deviation formalism which describes the occupation-time statistics of a single particle.

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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