Studies of the Stochastic Partial Differential Equations

随机偏微分方程的研究

• 批准号: 2246850
• 负责人: Le Chen
• 金额: $ 18万
• 依托单位: Auburn University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2023
• 资助国家: 美国
• 起止时间: 2023-08-01 至 2026-07-31
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2246850&HistoricalAwards=false
• 关键词: Studies; Stochastic; Partial; Differential; Equations

The work will study important properties of solutions to stochastic partial differential equations (SPDEs). These equations have applications in many fields, ranging from physics and chemistry to biology and financial markets. Key examples include the stochastic heat equation (SHE), the parabolic Anderson model (PAM), and the Kardar-Parisi-Zhang (KPZ) equation. These equations and their variants model crucial phenomena such as the spread of forest fires, smoke dispersal, growth of tumor tissues, superconductivity, and the formation of the universe's stratified structure and magnetic fields of planets or stars. This project will deepen our understanding of these phenomena by establishing essential properties of solutions, such as existence and uniqueness, moment asymptotics, positivity and support of solutions, existence and smoothness of probability density. Active efforts will be made to encourage participation by students from underrepresented groups in this research program, fostering an inclusive and diverse research environment. The investigator also participates in outreach programs for pre-college students. SPDEs depend on many technical parameters and conditions, including initial conditions, noise structures, conditions on the diffusion coefficients, geometric and analytic properties of the spatial domain and the corresponding boundary conditions, differential operators, among others. This project will focus on: (1) Studying SHE/PAM with rough initial conditions; (2) Investigating SHE in the sublinear growth regime, possibly with non-Lipschitz diffusion coefficients; and (3) Exploring the boundary effects to SHE/PAM. These three objectives will be implemented via six concrete projects. This project is jointly funded by the DMS Probability program and the Established Program to Stimulate Competitive Research (EPSCoR).This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

本文将研究随机偏微分方程解的重要性质。这些方程在许多领域都有应用，从物理和化学到生物学和金融市场。关键的例子包括随机热方程（SHE），抛物线安德森模型（PAM），和Kardar-Parisi-Zhang（KPZ）方程。这些方程及其变形模型的关键现象，如森林火灾的蔓延，烟雾扩散，肿瘤组织的生长，超导性，以及宇宙的分层结构和行星或恒星的磁场的形成。本项目将通过建立解的基本性质，如解的存在性和唯一性、矩渐近性、解的正性和支撑性、概率密度的存在性和光滑性，加深我们对这些现象的理解。将积极努力鼓励来自代表性不足群体的学生参与本研究计划，营造包容性和多样性的研究环境。调查员还参加了大学预科学生的外展计划。SPDE依赖于许多技术参数和条件，包括初始条件、噪声结构、扩散系数的条件、空间域的几何和分析性质以及相应的边界条件、微分算子等。该项目将侧重于：（1）在粗糙的初始条件下研究SHE/PAM;（2）在亚线性增长区研究SHE，可能具有非Lipschitz扩散系数;（3）探索边界效应对SHE/PAM的影响。这三个目标将通过六个具体项目来实现。该项目由DMS概率计划和刺激竞争研究的既定计划（EPSCoR）共同资助。该奖项反映了NSF的法定使命，并通过使用基金会的知识价值和更广泛的影响审查标准进行评估，被认为值得支持。