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arXiv 0812.4876math.AP
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二维抛物-椭圆型Keller-Segel模型小质量的渐近行为

Asymptotic behaviour for small mass in the two-dimensional parabolic-elliptic Keller-Segel model

Adrien Blanchet, Jean Dolbeault, Miguel Escobedo, Javier Fernández

摘要:

Keller-Segel系统描述了被化学物质吸引并能够发射化学物质的细胞的集体运动,在其最简单的形式中,它是用于细胞密度的保守漂移-扩散方程,耦合到用于化学吸引物浓度的椭圆型方程。本文讨论了自相似变量下的解向唯一稳态的收敛速率,它描述了解在原变量下的中间渐近性。虽然它是已知的,解决方案的全球存在的任何质量少$8π$,一个较小的质量条件是需要在我们的方法证明自相似变量的指数收敛速率。

英文摘要:

The Keller-Segel system describes the collective motion of cells that are attracted by a chemical substance and are able to emit it. In its simplest form, it is a conservative drift-diffusion equation for the cell density coupled to an elliptic equation for the chemo-attractant concentration. This paper deals with the rate of convergence towards a unique stationary state in self-similar variables, which describes the intermediate asymptotics of the solutions in the original variables. Although it is known that solutions globally exist for any mass less $8π$, a smaller mass condition is needed in our approach for proving an exponential rate of convergence in self-similar variables.

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