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arXiv 1406.6006math.AP
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抛物-抛物型Keller-Segel方程的唯一性和长时间渐近性

Uniqueness and long time asymptotics for the parabolic-parabolic Keller-Segel equation

Kleber Carrapatoso, Stéphane Mischler

摘要:

本文在弱解(或“自由能”解)的一般框架下,研究了具有有限质量$M\textless{} 8π$、有限对数二阶矩和有限熵的抛物-抛物型Keller-Segel方程。本文的目的有两个:(1)证明了“自由能”解的唯一性。证明使用了DiPerna-Lions重整化参数,这使得有可能得到“最佳正则性”以及在临界$L^{4/3}$ Lebesgue范数下两个可能解的差异估计,类似于$2d$涡度Navier-斯托克斯方程。(2)我们证明了自相似轮廓在准抛物椭圆区域的径向对称和多项式加权$L^2$指数稳定性。证明是基于一个扰动参数,它利用的指数稳定性的抛物椭圆型Keller-Segel方程建立的Campos-Dolbeault和Egana-Mischler的自相似配置文件。

英文摘要:

The present paper deals with the parabolic-parabolic Keller-Segel equation in the plane inthe general framework of weak (or "free energy") solutions associated to an initial datum with finite mass $M\textless{} 8π$, finite second log-moment and finite entropy. The aim of the paper is twofold:(1) We prove the uniqueness of the "free energy" solution. The proof uses a DiPerna-Lions renormalizing argument which makes possible to get the "optimal regularity" as well as an estimate of the difference of two possible solutions in the critical $L^{4/3}$ Lebesgue norm similarly as for the $2d$ vorticity Navier-Stokes equation. (2) We prove a radially symmetric and polynomial weighted $L^2$ exponential stability of the self-similar profile in the quasi parabolic-elliptic regime. The proof is based on a perturbation argument which takes advantage of the exponential stability of the self-similar profile for the parabolic-elliptic Keller-Segel equation established by Campos-Dolbeault and Egana-Mischler.

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