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arXiv math/0703912math.PR
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无序钉扎模型中的局域化转变。随机性对临界性质的影响

Localization transition in disordered pinning models. Effect of randomness on the critical properties

F. Toninelli

摘要:

这些笔记致力于定向聚合物与一维空间缺陷相互作用的统计力学。我们特别感兴趣的情况下,冻结无序的存在。这些聚合物模型经历局部化/离域化转变。关于这个主题有大量的(生物)物理学文献,因为这些系统描述了DNA双链中热产生的环的统计数据以及(1+1)维界面和无序壁之间的相互作用。在这些情况下,转变分别对应于DNA变性转变和润湿转变。更抽象地说,人们可以把这些模型看作是更新过程的随机和非齐次扰动。在过去的几年里,人们对这些系统的平衡性质的数学理解有了很大的进展。特别是,许多严格的结果有关的临界点的位置,有关的临界指数和路径特性的聚合物在两个热力学阶段(本地化和离域),现在可用。在这里,我们将集中讨论这个主题的某些方面--特别是无序的非微扰效应。所采用的数学工具范围从更新理论到大偏差,有趣的是,与最近在平均场自旋玻璃的数学研究中开发的技术有着紧密的联系。

英文摘要:

These notes are devoted to the statistical mechanics of directed polymers interacting with one-dimensional spatial defects. We are interested in particular in the situation where frozen disorder is present. These polymer models undergo a localization/delocalization transition. There is a large (bio)-physics literature on the subject since these systems describe, for instance, the statistics of thermally created loops in DNA double strands and the interaction between (1+1)-dimensional interfaces and disordered walls. In these cases the transition corresponds, respectively, to the DNA denaturation transition and to the wetting transition. More abstractly, one may see these models as random and inhomogeneous perturbations of renewal processes. The last few years have witnessed a great progress in the mathematical understanding of the equilibrium properties of these systems. In particular, many rigorous results about the location of the critical point, about critical exponents and path properties of the polymer in the two thermodynamic phases (localized and delocalized) are now available. Here, we will focus on some aspects of this topic - in particular, on the non-perturbative effects of disorder. The mathematical tools employed range from renewal theory to large deviations and, interestingly, show tight connections with techniques developed recently in the mathematical study of mean field spin glasses.

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