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arXiv 2007.05728math.AP
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具信号依赖运动的退化Keller-Segel模型的经典解的有界性

Boundedness of Classical Solutions to a Degenerate Keller--Segel Type Model with Signal-dependent Motilities

Kentaro Fujie, Jie Jiang

摘要:

本文考虑Keller-Segel型退化动力学模型的初Neumann边值问题.该系统具有渐近消失的信号依赖性递减运动函数,即,当信号的浓度趋于无穷大时,可能发生简并。在目前的工作中,我们感兴趣的经典解的运动函数满足一定的衰减率假设时的有界性。粗略地说,在二维设置,我们证明了经典解是全局有界的,如果运动函数下降慢于指数速度在高信号浓度。在更高的维度,有界性时,得到的运动减少在一定的代数速度。证明是基于我们以前的工作\cite{FJ19a,FJ19b}与修改后的Alikakos-Moser型迭代开发的比较方法。此外,还构造了新的估计,涉及某些加权能量建立有界性。

英文摘要:

In this paper, we consider the initial Neumann boundary value problem for a degenerate kinetic model of Keller--Segel type. The system features a signal-dependent decreasing motility function that vanishes asymptotically, i.e., degeneracies may take place as the concentration of signals tends to infinity. In the present work, we are interested in the boundedness of classical solutions when the motility function satisfies certain decay rate assumptions. Roughly speaking, in the two-dimensional setting, we prove that classical solution is globally bounded if the motility function decreases slower than an exponential speed at high signal concentrations. In higher dimensions, boundedness is obtained when the motility decreases at certain algebraical speed. The proof is based on the comparison methods developed in our previous work \cite{FJ19a,FJ19b} together with a modified Alikakos--Moser type iteration. Besides, new estimations involving certain weighted energies are also constructed to establish the boundedness.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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