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arXiv 2201.08716math.AP
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具有通量限制的趋化系统的爆破现象

Blow-up phenomena for a chemotaxis system with flux limitation

M. Marras, S. Vernier-Piro, T. Yokota

摘要:

本文考虑了以下抛物-椭圆交叉扩散方程组\begin{equation*} \left\{ \begin{array}{l} \begin{aligned} &u_t = Δu - \nabla(u f(|\nabla v|^2 )\nabla v), \\[6pt] &0= Δv -μ+ u , \quad \int_Ωv =0, \ \ μ:= \frac 1 {|Ω|} \int_Ω u dx, \\[6pt] &u(x,0)= u_0(x), \end{aligned} \end{array} \right. \end{equation*}在$Ω\times (0,\infty)$中的非负解,其中$Ω$是$\mathbb{R}^N$,$N\geq 3$中的球,在齐次Neumann边界条件下,$f(ξ) = (1+ ξ)^{-α}$,$0<α< \frac{N-2}{2(N-1)}$描述了交叉扩散通量的梯度依赖限制.在$f$和初值条件下,证明了对于某些$p>1$,在有限时间内解在$L^\infty$ -范数下爆破,也在$L^p$ -范数下爆破.此外,爆破时间的下界推导。\vskip .2truecm \noindent{\bf AMS Subject Classification }{Primary: 35B44; Secondary: 35Q92, 92C17.} \vskip .2truecm \noindent{\bf Key Words:}有限时间爆破;趋化性。

英文摘要:

In this paper we consider nonnegative solutions of the following parabolic-elliptic cross-diffusion system \begin{equation*} \left\{ \begin{array}{l} \begin{aligned} &u_t = Δu - \nabla(u f(|\nabla v|^2 )\nabla v), \\[6pt] &0= Δv -μ+ u , \quad \int_Ωv =0, \ \ μ:= \frac 1 {|Ω|} \int_Ω u dx, \\[6pt] &u(x,0)= u_0(x), \end{aligned} \end{array} \right. \end{equation*} in $Ω\times (0,\infty)$, with $Ω$ a ball in $\mathbb{R}^N$, $N\geq 3$ under homogeneous Neumann boundary conditions and $f(ξ) = (1+ ξ)^{-α}$, $0<α< \frac{N-2}{2(N-1)}$, which describes gradient-dependent limitation of cross diffusion fluxes. Under conditions on $f$ and initial data, we prove that a solution which blows up in finite time in $L^\infty$-norm, blows up also in $L^p$-norm for some $p>1$. Moreover, a lower bound of blow-up time is derived. \vskip.2truecm \noindent{\bf AMS Subject Classification }{Primary: 35B44; Secondary: 35Q92, 92C17.} \vskip.2truecm \noindent{\bf Key Words:} finite-time blow-up; chemotaxis.

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