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arXiv 2004.10132math.AP
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关于多种群临界质量Patlak-Keller-Segel系统:全局存在和无限时间聚集

On the critical mass Patlak-Keller-Segel system for multi-species populations: global existence and infinite time aggregation

Debabrata Karmakar, Gershon Wolansky

摘要:

在全欧几里得空间$\mathbb{R}^2.$中研究了多种群抛物椭圆型Patlak-Keller-Segel系统解的整体时间存在性和长时间渐近性.证明了在临界质量的边界条件下,当初值具有有限熵和二阶矩时,存在整体{ \it自由能解}.此外,我们表明,随着时间$t$接近无穷大,所有的解决方案的组件集中在一个单一的点的狄拉克措施的形式。我们的方法利用Wasserstein空间中的梯度流结构的De Giorgi的最小化运动或JKO计划的精神。由于临界质量的存在,JKO格式中的极小化问题一般不可能有解。我们找到了一个必要和充分的标准,任何极小化序列保持一致有界的适当的拓扑结构,以确保存在的极小。

英文摘要:

We study the global in time existence and long time asymptotics of solutions to the parabolic-elliptic Patlak-Keller-Segel system for the multi-species populations in the whole Euclidean space $\mathbb{R}^2.$ We prove that at the borderline case of critical mass there exists a global {\it free energy solution} subject to initial data with finite entropy and second moment. Moreover, we show that as time $t$ approaches to infinity, all the components of the solutions concentrate in the form of a Dirac measure at a single point. Our approach utilizes the gradient flow structure in Wasserstein space in the spirit of De Giorgi's minimizing movement or the JKO-schemes. Due to the critical mass, the minimization problem in JKO-schemes may not admit a solution in general. We find a necessary and sufficient criterion for which any minimizing sequence remains uniformly bounded in an appropriate topology to ensure the existence of a minimizer.

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