arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 0901.1100cond-mat.dis-nncond-mat.stat-mech
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无序系统的普适性与偏差

Universality and Deviations in Disordered Systems

Giorgio Parisi, Tommaso Rizzo

摘要:

我们计算了平均场自旋玻璃模型中每个自旋的自由能出现正的大偏差的概率。在热力学极限下,概率为零,为$P(Δf) \propto \exp[-N^2 L_2(Δf)]$。对于Sherrington-Kirkpatrick模型,我们发现$L_2(Δf)=O(Δf)^{12/5}$与数值数据吻合得很好,并假设自由能标度的典型小偏差为$N^{1/6}$。对于球形模型,我们发现$L_2(Δf)=O(Δf)^{3}$与最近的发现随机高斯矩阵的最大特征值的波动。该计算是基于一个循环的副本空间中的扩展和非高斯行为如下,在这两种情况下的事实,即扩展是发散在所有订单。得到了首阶项的因子,适当地表示了循环展开并显示了普适性,指出存在一个描述全对称破缺类中任何模型的小偏差的单一普适分布.

英文摘要:

We compute the probability of positive large deviations of the free energy per spin in mean-field Spin-Glass models. The probability vanishes in the thermodynamic limit as $P(Δf) \propto \exp[-N^2 L_2(Δf)]$. For the Sherrington-Kirkpatrick model we find $L_2(Δf)=O(Δf)^{12/5}$ in good agreement with numerical data and with the assumption that typical small deviations of the free energy scale as $N^{1/6}$. For the spherical model we find $L_2(Δf)=O(Δf)^{3}$ in agreement with recent findings on the fluctuations of the largest eigenvalue of random Gaussian matrices. The computation is based on a loop expansion in replica space and the non-gaussian behaviour follows in both cases from the fact that the expansion is divergent at all orders. The factors of the leading order terms are obtained resumming appropriately the loop expansion and display universality, pointing to the existence of a single universal distribution describing the small deviations of any model in the full-Replica-Symmetry-Breaking class.

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