Dynamic polymers: invariant measures and ordering by noise

Dynamic polymers: invariant measures and ordering by noise
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动态聚合物:不变测量和噪声排序

DOI:
10.1007/s00440-021-01099-5
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发表时间:
2022
影响因子:
2
通讯作者:
Chen, Hong-Bin
Chen, Hong-Bin
中科院分区:
数学1区
文献类型:
--
作者:
Bakhtin, Yuri;Chen, Hong-Bin

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我们发展了一种随机环境中无限体积定向聚合物测度的动力学方法。我们将一维聚合物动力学定义为钉扎在原点的聚合物上的随机梯度流,能量涉及二次近邻相互作用和与随机环境的局部相互作用。我们证明了解的存在性和唯一性,流的连续性,关于坐标偏序的保序性,以及渐近斜率的不变性。我们通过噪声建立排序,这意味着如果两个初始条件具有不同的斜率,则相关的解最终会在坐标方向上排序。这,沿着剪切不变性的性质和现有的结果静态无限体积聚合物措施,允许证明,对于一个固定的渐近斜率和几乎每一个实现的环境,聚合物动力学具有一个独特的不变的分布由一个独特的无限体积聚合物措施,而且,一个力一个解决方案的原则持有。我们还证明了每一个聚合物措施是集中在路径定义良好的渐近斜率,并给出了一个估计偏离直线。
We develop a dynamical approach to infinite volume directed polymer measures in random environments. We define polymer dynamics indimension as a stochastic gradient flow on polymers pinned at the origin, for energy involving quadratic nearest neighbor interaction and local interaction with random environment. We prove existence and uniqueness of the solution, continuity of the flow, the order-preserving property with respect to the coordinatewise partial order, and the invariance of the asymptotic slope. We establish ordering by noise which means that if two initial conditions have distinct slopes, then the associated solutions eventually get ordered coordinatewise. This, along with the shear-invariance property and existing results on static infinite volume polymer measures, allows to prove that for a fixed asymptotic slope and almost every realization of the environment, the polymer dynamics has a unique invariant distribution given by a unique infinite volume polymer measure, and, moreover, One Force—One Solution principle holds. We also prove that every polymer measure is concentrated on paths with well-defined asymptotic slopes and give an estimate on deviations from straight lines.
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