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arXiv 0704.3758math.PR
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IID场中定向高分子及其它模型配分拆函数的大偏差

Large Deviations for Partition Functions of Directed Polymers and Some Other Models in an IID Field

Iddo Ben-Ari

摘要:

考虑IID场中定向聚合物的分拆函数。我们假设场的负和正部分的两个尾部都至少和指数一样轻。众所周知的事实是,对于几乎每个场的实现,聚合物的自由能等于确定性常数,并且大偏差的上尾是指数的。大偏差的下尾通常比指数更轻。在本文中,我们提供了一种方法来获得的大偏差,这是尖锐的乘法常数的下尾的衰减率的估计。因此,我们表明,较低的尾部的大偏差表现出三个制度,根据尾部的负部分的字段。我们的方法应用简单,可用于其他有向和无向模型,包括首次/末次通过渗流和抛物型Anderson模型

英文摘要:

Consider the partition function of a directed polymer in an IID field. We assume that both tails of the negative and the positive part of the field are at least as light as exponential. It is a well-known fact that the free energy of the polymer is equal to a deterministic constant for almost every realization of the field and that the upper tail of the large deviations is exponential. The lower tail of the large deviations is typically lighter than exponential. In this paper we provide a method to obtain estimates on the rate of decay of the lower tail of the large deviations, which are sharp up to multiplicative constants. As a consequence, we show that the lower tail of the large deviations exhibits three regimes, determined according to the tail of the negative part of the field. Our method is simple to apply and can be used to cover other oriented and non-oriented models including first/last-passage percolation and the parabolic Anderson 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。

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