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arXiv 1003.0443math.PRcond-mat.stat-mechmath-phmath.MP
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1+1维定向无规聚合物自由能的概率分布

Probability Distribution of the Free Energy of the Continuum Directed Random Polymer in 1+1 dimensions

Gideon Amir, Ivan Corwin, Jeremy Quastel

摘要:

本文考虑随机热方程\partial_T \mathcal{Z} = 1/2 \partial_X^2 \mathcal{Z} - \mathcal{Z} \dot{\mathscr{W}}具有δ函数初始条件\mathcal{Z}(T=0)= δ_0的解,其对数经适当的归一化后为连续定向聚合物的自由能,或Kardar-Parisi-Zhang方程具有窄楔形初始条件的解.我们得到明确的一维边缘分布的公式-{ \it交叉分布} -这之间插入一个标准的高斯分布(小时间)和GUE Tracy-Widom分布(大时间)。证明是通过严格的最速下降分析的Tracy-Widom公式的非对称简单排除与抗冲击的初始数据,这是收敛到连续方程在适当的弱非对称限制。该极限还描述了对称和非对称排斥过程之间的交叉行为。

英文摘要:

We consider the solution of the stochastic heat equation \partial_T \mathcal{Z} = 1/2 \partial_X^2 \mathcal{Z} - \mathcal{Z} \dot{\mathscr{W}} with delta function initial condition \mathcal{Z} (T=0)= δ_0 whose logarithm, with appropriate normalizations, is the free energy of the continuum directed polymer, or the solution of the Kardar-Parisi-Zhang equation with narrow wedge initial conditions. We obtain explicit formulas for the one-dimensional marginal distributions -- the {\it crossover distributions} -- which interpolate between a standard Gaussian distribution (small time) and the GUE Tracy-Widom distribution (large time). The proof is via a rigorous steepest descent analysis of the Tracy-Widom formula for the asymmetric simple exclusion with anti-shock initial data, which is shown to converge to the continuum equations in an appropriate weakly asymmetric limit. The limit also describes the crossover behaviour between the symmetric and asymmetric exclusion processes.

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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