arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2007.01687cond-mat.stat-mechcond-mat.dis-nn
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用腔方法求解全连通球$p$ -自旋模型:与副本结果的等价性

Solving the fully-connected spherical $p$-spin model with the cavity method: equivalence with the replica results

Giacomo Gradenigo, Maria Chiara Angelini, Luca Leuzzi, Federico Ricci-Tersenghi

摘要:

球形$p$ -自旋是玻璃态物理学的基本模型,这要归功于它的解析解可以通过复型方法实现。不幸的是,复制方法有一些缺点:它很难应用于稀释模型,并且超出它的假设并不立即清楚。这两个缺点都可以通过使用空腔方法来克服,但是,需要小心地应用于球形模型。在这里,我们展示了如何在完全图上写出球形$p$ -自旋模型的腔方程,包括在一阶对称(RS)模型(对应于置信传播)和一阶复本对称性破缺(1 RSB)模型(对应于测量传播)中。腔场方程可以用高斯(RS)和多元高斯(1 RSB)模型求解。我们计算的自由能在两个ansatzes和检查的结果是相同的副本计算,预测相变到1 RSB相在低温下。用空腔法求解该模型有许多优点。腔边缘的任何附加值的物理意义都是非常清楚的。腔方法直接与局部量的分布一起工作,这允许将该方法推广到稀释图。我们在这里提出的是稀释版本的球形$p$ -自旋模型的解决方案的第一步,这是一个基本的模型在随机激光器和有趣的$per~se$作为一个模拟器的经典全连接$p$ -自旋模型的模拟版本的理论。

英文摘要:

The spherical $p$-spin is a fundamental model for glassy physics, thanks to its analytic solution achievable via the replica method. Unfortunately the replica method has some drawbacks: it is very hard to apply to diluted models and the assumptions beyond it are not immediately clear. Both drawbacks can be overcome by the use of the cavity method, which, however, needs to be applied with care to spherical models. Here we show how to write the cavity equations for spherical $p$-spin models on complete graphs, both in the Replica Symmetric (RS) ansatz (corresponding to Belief Propagation) and in the 1-step Replica Symmetry Breaking (1RSB) ansatz (corresponding to Survey Propagation). The cavity equations can be solved by a Gaussian (RS) and multivariate Gaussian (1RSB) ansatz for the distribution of the cavity fields. We compute the free energy in both ansatzes and check that the results are identical to the replica computation, predicting a phase transition to a 1RSB phase at low temperatures. The advantages of solving the model with the cavity method are many. The physical meaning of any ansatz for the cavity marginals is very clear. The cavity method works directly with the distribution of local quantities, which allows to generalize the method to dilute graphs. What we are presenting here is the first step towards the solution of the diluted version of the spherical $p$-spin model, which is a fundamental model in the theory of random lasers and interesting $per~se$ as an easier-to-simulate version of the classical fully-connected $p$-spin model.

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