Models and Asymptotics of Non-equilibrium Steady States in Driven Diffusive Systems

驱动扩散系统中非平衡稳态的模型和渐近

• 批准号: 1212167
• 负责人: Nicholas Ercolani
• 金额: $ 22.6万
• 依托单位: University of Arizona
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2012
• 资助国家: 美国
• 起止时间: 2012-09-01 至 2016-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1212167&HistoricalAwards=false
• 关键词: Models; Asymptotics; Non; equilibrium; Steady

This award will support the analysis of non-equilibrium steady states (NESS) in driven diffusive systems. Physical systems of interest in this general class are typically modeled either deterministically by diffusive nonlinear evolution equations or stochastically by certain types of Markov processes. The NESS referred to here differ from the equilibria of linear dynamics or the invariant measures of detailed balance in that the non-equilibrium steady states exhibit phase separation (often driven by boundary dynamics), spontaneous symmetry breaking and/or long range correlations away from critical transitions. Specific contexts to be explored include the strong bending regime of striped pattern formation, spatial random partitions, and random matrix ensembles. Non-equilibrium steady states are typical for a number of physical systems and models, including defect condensation in pattern forming systems driven far from threshold, classical molecule formation, a system of interacting Bose particles, shaken granular gasses, infinite allele models, network formation by preferential attachment or rewiring, stochastic growth models and two-dimensional quantum gravity. The award will support research approaches on the behavior of such systems that uses deterministic (non-random) as well as stochastic (random) techniques.

该奖项将支持驱动扩散系统的非平衡稳态（NESS）分析。在这一类中感兴趣的物理系统通常由扩散非线性演化方程确定地建模，或由某些类型的马尔可夫过程随机地建模。这里提到的NESS不同于线性动力学的平衡或详细平衡的不变测量，因为非平衡稳态表现出相分离（通常由边界动力学驱动），自发对称性破缺和/或远离临界跃迁的长距离相关性。要探讨的具体背景包括条纹模式形成的强弯曲机制、空间随机分区和随机矩阵集成。非平衡稳态是许多物理系统和模型的典型特征，包括远离阈值驱动的模式形成系统中的缺陷凝聚，经典分子形成，相互作用玻色粒子系统，振荡颗粒气体，无限等位基因模型，优先连接或重新布线的网络形成，随机生长模型和二维量子引力。该奖项将支持使用确定性（非随机）和随机（随机）技术的此类系统行为的研究方法。