arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 0910.4553cond-mat.dis-nncond-mat.stat-mech
收藏

稀释平均场自旋玻璃中自由能的大偏差

Large Deviations of the Free-Energy in Diluted Mean-Field Spin-Glass

Giorgio Parisi, Tommaso Rizzo

摘要:

在有限维和全连接模型中,自旋玻璃中样品间的自由能波动表现出明显不同的行为,即高斯与非高斯。自旋玻璃模型定义在各种类型的随机图之间的这两类模型的中间情况,我们调查其自由能波动的性质是否是高斯或不。有人认为,只要相互作用是局部非均匀的,即在大多数情况下,除了具有固定连接性和随机耦合$J_{ij}=\pm \tilde{J}$的模型之外,高斯行为是存在的。我们通过各种分析结果证实了这些预期。特别是,我们揭示了人口的人口定义在不同的网站上的晶格和高斯性质的自由能波动的字段的空间波动之间的连接。相反,在局部均匀晶格上,粒子数不会在各个位置上波动,因此自由能的小偏差是非高斯的,并且与Sherrington-Kirkpatrick模型一样。

英文摘要:

Sample-to-sample free energy fluctuations in spin-glasses display a markedly different behaviour in finite-dimensional and fully-connected models, namely Gaussian vs. non-Gaussian. Spin-glass models defined on various types of random graphs are in an intermediate situation between these two classes of models and we investigate whether the nature of their free-energy fluctuations is Gaussian or not. It has been argued that Gaussian behaviour is present whenever the interactions are locally non-homogeneous, i.e. in most cases with the notable exception of models with fixed connectivity and random couplings $J_{ij}=\pm \tilde{J}$. We confirm these expectation by means of various analytical results. In particular we unveil the connection between the spatial fluctuations of the populations of populations of fields defined at different sites of the lattice and the Gaussian nature of the free-energy fluctuations. On the contrary on locally homogeneous lattices the populations do not fluctuate over the sites and as a consequence the small-deviations of the free energy are non-Gaussian and scales as in the Sherrington-Kirkpatrick model.

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。

↑