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arXiv 2401.17697math.AP
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具有信号依赖运动性的抛物-椭圆Keller--Segel系统中通过轻微超线性降解抑制爆破解

Suppression of Blowup by Slightly Superlinear Degradation in a Parabolic-Elliptic Keller--Segel System with Signal-dependent Motility

Aijing Lu, Jie Jiang

AI总结:

本文针对带信号依赖运动性的抛物-椭圆Keller-Segel系统,在N≤3时引入s log s阶轻微超线性降解源项,证明全局经典解一致有界性,揭示爆破抑制机制,运动函数形式更一般,证明用比较技巧和能量方法。

摘要:

本文研究一类带信号依赖运动性和源项的抛物-椭圆Keller-Segel系统的初值-Neumann边值问题。已有研究严格证明,当维度N≥2时,该系统的无源版本会出现无穷时间爆破现象。本文在N≤3的条件下,引入对密度具有轻微超线性降解效应、最大增长阶为s log s的附加源项,证明了全局经典解的一致有界性,揭示了一种充分的爆破抑制机制。与近期局限于单调非增情形的研究(如FuJi2020、LyWa2023)相比,本文考虑的运动函数形式更具一般性。证明的核心在于推导系统第二分量的上界和类熵估计,二者分别通过巧妙的比较技巧和能量方法实现。

英文摘要:

In this paper, we consider an initial-Neumann boundary value problem for a parabolic-elliptic Keller-Segel system with signal-dependent motility and a source term. Previous research has rigorously shown that the source-free version of this system exhibits an infinite-time blowup phenomenon when dimension $N \geq 2$. In the current work, when $N \leq 3$, we establish uniform boundedness of global classical solutions with an additional source term that involves slightly super-linear degradation effect on the density, of a maximum growth order $s\log s$, unveiling a sufficient blowup suppression mechanism. The motility function considered in our work takes a rather general form compared with recent works \cite{FuJi2020, LyWa2023} which were restricted to the monotone non-increasing case. The cornerstone of our proof lies in deriving an upper bound for the second component of the system and an entropy-like estimate, which are achieved through tricky comparison skills and energy methods, respectively.

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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