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Universal and nonuniversal tails of distribution functions in the directed polymer and Kardar-Parisi-Zhang problems

机译:有向聚合物和Kardar-Parisi-Zhang问题中分布函数的通用和非通用尾

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摘要

The optimal-fluctuation approach is applied to study the most distant (nonuniversal) tails of the free-energy distribution function P_L(F) for an elastic string (of a large but finite length L) interacting with a quenched random potential. A further modification of this approach is proposed which takes into account the renormal-ization effects and allows one to study the closest (universal) parts of the tails. The problem is analyzed for different dimensions of a space in which the polymer is imbedded. In terms of the stochastic growth problem, the same distribution function describes the distribution of heights in the regime of a nonstationary growth in the situation when an interface starts to grow from a fiat configuration.
机译:最优涨落法被用于研究自由能量分布函数P_L(F)的最远(非通用)尾部,该弹性尾部具有较大的(但长度有限)长度的弹性弦,并与猝灭的随机势相互作用。提出了对该方法的进一步修改,该修改考虑了重新归一化的影响并允许人们研究尾巴的最接近(通用)部分。针对嵌入聚合物的空间的不同尺寸分析了该问题。就随机增长问题而言,相同的分布函数描述了当界面从法线配置开始增长时,在非平稳增长情况下高度的分布。

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