Uniqueness and nonlinear stability of positive entire solutions in parabolic-parabolic chemotaxis models with logistic source on bounded heterogeneous environments

Abstract

This paper studies the asymptotic behavior of solutions of the parabolic-parabolic chemotaxis model with logistic-type sources in heterogeneous bounded domains: \begin{equation*} \label{u-v-eq00} \begin{cases} u_t=\Delta u-\chi\nabla\cdot (u \nabla v)+u\Big(a_0(t,x)-a_1(t,x)u-a_2(t,x)\int_{\Omega}u\Big),\quad x\in \Omega\cr \tau v_t=\Delta v-\lambda v +\mu u,\quad x\in \Omega \cr \frac{\p u}{\p \nu}=\frac{\p v}{\p \nu}=0,\quad x\in\p\Omega. \end{cases}\qquad(\ast) \end{equation*} \noindent We find parameter regions in which the system has a unique positive entire solution, which is globally asymptotically stable. {More precisely under suitable assumptions on the model's parameters, the system has a unique entire positive solution $(u^*(x,t),v^*(x,t))$ such that for any %$t_0\in\RR$ and $u_0 \in C^0(\bar{\Omega}),$ $v_0 \in W^{1,\infty}(\bar{\Omega})$ with $u_0,v_0\ge 0$ and $u_0\not\equiv 0$, the global classical solution $(u(x,t;t_0,u_0,v_0)$, $v(x,t;t_0,u_0,v_0))$ of $(\ast)$ satisfies $$ \lim_{t \to \infty}\Big(\sup_{t_0 \in \mathbb{R}}\|u(\cdot,t;t_0,u_0,v_0)-u^*(\cdot,t)\|_{C^0(\bar\Omega)}+\sup_{t_0 \in \mathbb{R}}\|v(\cdot,t;t_0,u_0,v_0)-v^*(\cdot,t)\|_{C^0(\bar\Omega)}\Big)=0. $$