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arXiv cond-mat/0407635cond-mat.stat-mech
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具有长程相互作用的定向渗流:模拟非平衡润湿

Directed Percolation with long-range interactions: modeling non-equilibrium wetting

F. Ginelli, H. Hinrichsen, R. Livi, D. Mukamel, A. Politi

摘要:

有人认为,一些相变中观察到的非平衡润湿现象的模型与接触过程的长程相互作用。这是研究通过引入一个模型,其中的一个网站的激活率在一个非活性岛的长度$\ell$的边缘是$1+a\ell^{-σ}$。平均场分析和数值模拟表明,对于$σ>1$,跃迁是连续的,属于定向渗流普适类,而对于$0<σ<1$,跃迁是一级的.然后应用该准则讨论各种非平衡润湿模型的临界性质。

英文摘要:

It is argued that some phase--transitions observed in models of non-equilibrium wetting phenomena are related to contact processes with long-range interactions. This is investigated by introducing a model where the activation rate of a site at the edge of an inactive island of length $\ell$ is $1+a\ell^{-σ}$. Mean--field analysis and numerical simulations indicate that for $σ>1$ the transition is continuous and belongs to the universality class of directed percolation, while for $0<σ<1$, the transition becomes first order. This criterion is then applied to discuss critical properties of various models of non--equilibrium wetting.

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