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arXiv 1012.3852cond-mat.stat-mech
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乘积图上伊辛模型的非平衡临界性质

Non-equilibrium critical properties of the Ising model on product graphs

R. Burioni, F. Corberi, A. Vezzani

摘要:

本文研究了无相变(Tc = 0)的因子图的直积图上定义的伊辛模型的非平衡临界性质.在这类积图上,伊辛模型具有有限温度相变的特征,我们发现了一种类似于规则晶格上已知的标度行为模式:观测量采用时间函数L(t)的标度形式,其含义是长度不断增长,其中相干分形结构(临界状态)逐渐形成。计算普适量,如临界指数和极限涨落耗散比X_ \infty,使我们能够评论将普适性概念扩展到非均匀衬底上的临界行为的可能性。

英文摘要:

We study numerically the non-equilibrium critical properties of the Ising model defined on direct products of graphs, obtained from factor graphs without phase transition (Tc = 0). On this class of product graphs, the Ising model features a finite temperature phase transition, and we find a pattern of scaling behaviors analogous to the one known on regular lattices: Observables take a scaling form in terms of a function L(t) of time, with the meaning of a growing length inside which a coherent fractal structure, the critical state, is progressively formed. Computing universal quantities, such as the critical exponents and the limiting fluctuation-dissipation ratio X_\infty, allows us to comment on the possibility to extend universality concepts to the critical behavior on inhomogeneous substrates.

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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