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arXiv 1609.05015math.AP
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完整的Keller-Segel模型在非光滑区域上是适定的

The full Keller-Segel model is well-posed on nonsmooth domains

Dirk Horstmann, Hannes Meinlschmidt, Joachim Rehberg

摘要:

本文证明了由四个抛物型方程组成的拟线性强耦合反应-交叉扩散方程组--Keller-Segel方程组在适当的正则初值条件下,在适当的函数空间中总是存在唯一的局部时间解的意义下,在二维和三维空间中是适定的.证明是通过一个抽象的解定理非局部拟线性方程的阿曼和进行一般源项。它从根本上是基于最近的非平凡的椭圆和抛物规律性的结果,甚至在相当一般的非光滑空间域。这使我们能够工作在一个非光滑的设置,这是不提供在经典的抛物系统理论。显然,到目前为止,还没有完整的Keller-Segel系统的可比较的存在性结果。由于大类可能的非光滑域承认,我们也获得了新的结果,“标准”的Keller-Segel系统组成的只有两个方程作为特殊情况。

英文摘要:

In this paper we prove that the full Keller-Segel system, a quasilinear strongly coupled reaction-crossdiffusion system of four parabolic equations, is well-posed in space dimensions 2 and 3 in the sense that it always admits an unique local-in-time solution in an adequate function space, provided that the initial values are suitably regular. The proof is done via an abstract solution theorem for nonlocal quasilinear equations by Amann and is carried out for general source terms. It is fundamentally based on recent nontrivial elliptic and parabolic regularity results which hold true even on rather general nonsmooth spatial domains. This enables us to work in a nonsmooth setting which is not available in classical parabolic systems theory. Apparently, there exists no comparable existence result for the full Keller-Segel system up to now. Due to the large class of possibly nonsmooth domains admitted, we also obtain new results for the "standard" Keller-Segel system consisting of only two equations as a special case.

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