【5月3日】Nonlinear Aggregation-Diffusion Equations: Stationary States, Functional inequalities & Stabilization

2019-04-23

时间:2019-05-3,15:30-16:30

地点:延安路校区 中北365室

申办单位:理学院

主讲人:J. A. Carrillo

国籍:英国

使用语言:英语

主讲人简介:

J. A. Carrillo现为英国帝国理工学院(Imperial College London)数学系“应用与数值分析”方向首席教授,欧洲科学院院士(数学),曾担任欧洲数学会应用数学学会会长,入选科睿唯安“高被引科学家(数学)”,现为多份国际著名数学期刊如SIAM J Math Anal, J London Math Soc的编委。主要研究偏微分方程,已发表期刊论文190余篇, MR引用4300余次。

活动内容摘要:

We analyse under which conditions equilibration between two competing effects, repulsion modeled by nonlinear diffusion and attraction modeled by nonlocal interaction,occurs. I will discuss several regimes that appear in aggregation diffusion problems with homogeneous kernels. I will rst concentrate in the fair competition case distinguishing among porous medium like cases and fast diffusion like ones. I will discuss the main qualitative properties in terms of stationary states and minimizers of the free energies.In particular, all the porous medium cases are critical while the fast diffusion are not,and they are characterized by functional inequalites related to Hardy-Littlewood-Sobolev inequalities. In the second part, I will discuss the diffusion dominated case in which this balance leads to continuous compactly supported radially decreasing equilibrium configurations for all masses. All stationary states with suitable regularity are shown to be radially symmetric by means of continuous Steiner symmetrisation and mass transportation techniques. Calculus of variations tools allow us to show the existence of global minimizers among these equilibria. Finally, in the particular case of Newtonian interaction in two dimensions they lead to uniqueness of equilibria for any given mass up totranslation and to the convergence of solutions of the associated nonlinear aggregation-diffusion equations towards this unique equilibrium profile up to translations as time tends to infinity. This talk is based on works in collaboration with V. Calvez, M. Delgadino, J. Dolbeault, R. Frank, S. Hittmeir, F. Hoffmann, F. Patacchini, B. Volzone, and Y. Yao.

主持人:陶有山