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arXiv 0907.4148cond-mat.stat-mech
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具有对分解定态的一维质量凝聚

Mass condensation in one dimension with pair-factorized steady states

B. Waclaw, J. Sopik, W. Janke, H. Meyer-Ortmanns

摘要:

我们考虑随机规则的质量运输,导致稳定的状态,分解的链接的一维环。基于稳态的知识,我们推导出从液体到冷凝相的相变的起始,其特征在于冷凝物的存在。对于进入跳跃率的各种类型的权重函数,我们确定凝聚体的形状、其随系统尺寸的缩放以及单点质量分布作为特征静态属性。事实证明,凝聚体的形状和尺度并不是普适的,而是取决于局域和超局域相互作用之间的竞争。所以我们可以把形状从三角形的包络调整到抛物线形或矩形。当我们在巨正则形式主义中处理液相时,我们为凝聚相开发了不同的分析方法。其预测得到了数值模拟的证实。可能的扩展到更高的维度表示。

英文摘要:

We consider stochastic rules of mass transport which lead to steady states that factorize over the links of a one-dimensional ring. Based on the knowledge of the steady states, we derive the onset of a phase transition from a liquid to a condensed phase that is characterized by the existence of a condensate. For various types of weight functions which enter the hopping rates, we determine the shape of the condensate, its scaling with the system size, and the single-site mass distribution as characteristic static properties. As it turns out, the condensate's shape and its scaling are not universal, but depend on the competition between local and ultralocal interactions. So we can tune the shape from a delta-like envelope to a parabolic-like or a rectangular one. While we treat the liquid phase in the grand-canonical formalism, we develop a different analytical approach for the condensed phase. Its predictions are well confirmed by numerical simulations. Possible extensions to higher dimensions are indicated.

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