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arXiv 1004.0408cond-mat.stat-mechmath-phmath.MP
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零程凝聚中的有限尺寸效应和亚稳性

Finite size effects and metastability in zero-range condensation

Paul Chleboun, Stefan Grosskinsky

摘要:

我们研究零程过程,这是已知的表现出凝聚过渡,在临界密度以上的非零部分的所有粒子积累在一个单一的晶格网站。这种现象一直是最近的研究兴趣的主题,并在热力学极限很好地理解。该系统显示出大的有限尺寸效应,我们观察到的亚稳流体和凝聚相之间的切换接近临界点,在相关的观测值的连续限制行为。我们描述了首阶有限尺寸效应,并在严格的标度极限下建立了临界附近的间断。我们还使用电流匹配参数和流体相的超临界密度的扩展来描述亚稳相。这构成了一个有趣的例子,其中热力学限制未能捕获动态的基本部分,这在具有中等系统大小的应用中特别相关,例如交通流或粒度聚类。

英文摘要:

We study zero-range processes which are known to exhibit a condensation transition, where above a critical density a non-zero fraction of all particles accumulates on a single lattice site. This phenomenon has been a subject of recent research interest and is well understood in the thermodynamic limit. The system shows large finite size effects, and we observe a switching between metastable fluid and condensed phases close to the critical point, in contrast to the continuous limiting behaviour of relevant observables. We describe the leading order finite size effects and establish a discontinuity near criticality in a rigorous scaling limit. We also characterise the metastable phases using a current matching argument and an extension of the fluid phase to supercritical densities. This constitutes an interesting example where the thermodynamic limit fails to capture essential parts of the dynamics, which are particularly relevant in applications with moderate system sizes such as traffic flow or granular clustering.

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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