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arXiv 1607.04864math.PRmath-phmath.APmath.DSmath.MP
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定向聚合物的热力学极限与Burgers方程的定态解

Thermodynamic limit for directed polymers and stationary solutions of the Burgers equation

Yuri Bakhtin, Liying Li

摘要:

本文的第一个目的是证明时间离散和空间连续的聚合物模型在随机势场中的随机游动的多个渐近结果。这些成果包括:确定性的自由能密度的存在,在无限体积极限的每一个固定的渐近斜率;浓度不等式的自由能意味着一个约束其波动指数;直线估计意味着一个约束的横向波动指数。这个程序的高潮是几乎必然存在性和唯一性的聚合物措施的单边无限路径与给定的端点和斜率,并解释这些无限体积吉布斯措施的热力学极限。此外,我们证明了具有相同斜率和不同端点的聚合测度的边缘是彼此渐近的。本文的第二个目标是在不作任何紧性假设的情况下,发展了具有正粘性和随机反冲力的Burgers方程的遍历论。也就是说,我们证明了一个力-一个解决方案的原则,使用无限体积聚合物措施,以构建一个家庭的稳定的整体解决方案,该系统,并证明这些解决方案是一个一点拉回吸引子的初始条件下具有相同的空间平均。这提供了一个自然扩张的相同的程序实现的无粘Burgers方程的帮助下的行动极小,可以被视为零温度限制的聚合物措施。

英文摘要:

The first goal of this paper is to prove multiple asymptotic results for a time-discrete and space-continuous polymer model of a random walk in a random potential. These results include: existence of deterministic free energy density in the infinite volume limit for every fixed asymptotic slope; concentration inequalities for free energy implying a bound on its fluctuation exponent; straightness estimates implying a bound on the transversal fluctuation exponent. The culmination of this program is almost sure existence and uniqueness of polymer measures on one-sided infinite paths with given endpoint and slope, and interpretation of these infinite-volume Gibbs measures as thermodynamic limits. Moreover, we prove that marginals of polymer measures with the same slope and different endpoints are asymptotic to each other. The second goal of the paper is to develop ergodic theory of the Burgers equation with positive viscosity and random kick forcing on the real line without any compactness assumptions. Namely, we prove a One Force -- One Solution principle, using the infinite volume polymer measures to construct a family of stationary global solutions for this system, and proving that each of those solutions is a one-point pullback attractor on the initial conditions with the same spatial average. This provides a natural extension of the same program realized for the inviscid Burgers equation with the help of action minimizers that can be viewed as zero temperature limits of polymer measures.

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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