Blow-up phenomena in a parabolic-elliptic-elliptic attraction-repulsion chemotaxis system with superlinear logistic degradation

TL;DR

This paper investigates blow-up phenomena in a chemotaxis system with attraction-repulsion and superlinear logistic degradation, providing conditions for blow-up and estimates on blow-up time.

Contribution

It is the first to analyze blow-up in a chemotaxis system with logistic degradation and attraction-repulsion effects for parameters near critical values.

Findings

Solutions blow up in finite time under certain conditions.

Lower bounds for blow-up time are established.

Blow-up occurs in both $L^0$ and $L^0$ norms.

Abstract

This paper is concerned with the attraction-repulsion chemotaxis system with superlinear logistic degradation, \begin{align*} \begin{cases} u_t = \Delta u - \chi \nabla\cdot(u \nabla v) + \xi \nabla\cdot (u \nabla w) + \lambda u - \mu u^k, \quad &x \in \Omega,\ t>0,\\[1.05mm] 0= \Delta v + \alpha u - \beta v, \quad &x \in \Omega,\ t>0,\\[1.05mm] 0= \Delta w + \gamma u - \delta w, \quad &x \in \Omega,\ t>0, \end{cases} \end{align*} under homogeneous Neumann boundary conditions, in a ball $\Omega \subset \mathbb{R}^n$ ($n \ge 3$), with constant parameters $\lambda \in \mathbb{R}$, $k>1$, $\mu, \chi, \xi, \alpha, \beta, \gamma, \delta>0$. Blow-up phenomena in the system have been well investigated in the case $\lambda=\mu=0$, whereas the attraction-repulsion chemotaxis system with logistic degradation has been not studied. Under the condition that $k>1$ is close to $1$, this paper ensures a solution which blows up in $L^\infty$-norm and $L^\sigma$-norm with some $\sigma>1$ for some nonnegative initial data. Moreover, a lower bound of blow-up time is derived.