arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 0902.0564cond-mat.stat-mech
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变稀释随机图上伊辛模型的有限尺寸效应

Finite Size Effects for the Ising Model on Random Graphs with Varying Dilution

Julien Barre', Antonia Ciani, Duccio Fanelli, Franco Bagnoli, Stefano Ruffo

摘要:

研究了具有$N$节点和$N^γ$边的随机图上伊辛模型的平衡磁化强度的有限尺寸修正,其中$N$节点和$N^γ$边具有$1 < γ\leq 2$ .通过方便地重新调整耦合常数,自由能变得广泛。正如预期的那样,该系统显示的相变的平均场类型的所有考虑值的$γ$在完全连接的居里-外斯模型的转变温度。有限尺寸修正的参数$γ$不同的值,使用两种不同的方法:基于复制的有限$N$扩展,和腔的方法。数值模拟与理论预测进行了比较。基于腔的分析显示出更好地同意与数值。

英文摘要:

We investigate the finite size corrections to the equilibrium magnetization of an Ising model on a random graph with $N$ nodes and $N^γ$ edges, with $1 < γ\leq 2$. By conveniently rescaling the coupling constant, the free energy is made extensive. As expected, the system displays a phase transition of the mean-field type for all the considered values of $γ$ at the transition temperature of the fully connected Curie-Weiss model. Finite size corrections are investigated for different values of the parameter $γ$, using two different approaches: a replica-based finite $N$ expansion, and a cavity method. Numerical simulations are compared with theoretical predictions. The cavity based analysis is shown to agree better with numerics.

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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