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arXiv 1903.08196math.AP
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一类吸引-排斥趋化系统爆破时间的显式下界

Explicit lower bound of blow--up time for an attraction--repulsion chemotaxis system

Giuseppe Viglialoro

摘要:

本文研究零通量吸引-排斥趋化系统\begin{equation}\label{ProblemAbstract} \tag{$\Diamond$} \begin{cases} u_{ t}=Δu -χ\nabla \cdot (u\nabla v)+ξ\nabla \cdot (u\nabla w) & \textrm{in }Ω\times (0,t^*), \\ 0=Δv+αu-βv & \textrm{in } Ω\times (0,t^*),\\ 0=Δw+γu-δw & \textrm{in } Ω\times (0,t^*),\\ \end{cases} \end{equation}的经典解,其中$Ω$是$\mathbb{R}^2$的光滑有界区域,$t^*$是爆破时间,$α,β,γ,δ,χ,ξ$是正实数.从文献中可以知道,在上述参数之间的适当相互作用和对初始数据$u({\bf x},0)=u_0\in C^0(\barΩ)$的适当小性假设下,系统\eqref{ProblemAbstract}具有唯一的经典解,该解成为无界的$t\nearrow t^*$。这项调查的主要结果是提供一个明确的下界$t^*$估计的$\int_Ωu_0^2 d{\bf x}$和通过建立良好的技术的基础上常微分不等式。

英文摘要:

In this paper we study classical solutions to the zero--flux attraction--repulsion chemotaxis--system \begin{equation}\label{ProblemAbstract} \tag{$\Diamond$} \begin{cases} u_{ t}=Δu -χ\nabla \cdot (u\nabla v)+ξ\nabla \cdot (u\nabla w) & \textrm{in }Ω\times (0,t^*), \\ 0=Δv+αu-βv & \textrm{in } Ω\times (0,t^*),\\ 0=Δw+γu-δw & \textrm{in } Ω\times (0,t^*),\\ \end{cases} \end{equation} where $Ω$ is a smooth and bounded domain of $\mathbb{R}^2$, $t^*$ is the blow--up time and $α,β,γ,δ,χ,ξ$ are positive real numbers. From the literature it is known that under a proper interplay between the above parameters and suitable smallness assumptions on the initial data $u({\bf x},0)=u_0\in C^0(\barΩ)$, system \eqref{ProblemAbstract} has a unique classical solution which becomes unbounded as $t\nearrow t^*$. The main result of this investigation is to provide an explicit lower bound for $t^*$ estimated in terms of $\int_Ωu_0^2 d{\bf x}$ and attained by means of well--established techniques based on ordinary differential inequalities.

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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