Global existence and boundedness in an attraction-repulsion chemotaxis system with nonlocal logistic source and sublinear productions (2507.08305v1)

Abstract: This paper deals with the following attraction-repulsion chemotaxis system with nonlocal logistic source and sublinear productions \begin{align} \left{ \begin{array}{rrll} &&u_t = d_1 \Delta u-\chi \nabla\cdot(u^k \nabla v)+\xi \nabla\cdot(u^k \nabla w)+ \mu u^m \left(1-\int_\Omega u(x,t)\dx\right),\hspace*{0.5cm} &x\in\Omega,\, t>0,\ &&v_t = d_2 \Delta v-\alpha v+f(u), &x\in\Omega,\, t>0,\ &&w_t = d_3 \Delta w-\beta w+f(u), &x\in\Omega,\, t>0,\ &&\frac{\partial u}{\partial\nu} = \frac{\partial v}{\partial\nu} = \frac{\partial w}{\partial\nu} = 0, &x\in\partial\Omega,\, t>0,\ &&u(x,0) = u_0, \quad v(x,0)=v_0, \quad w(x,0)=w_0,&x\in\Omega, \end{array} \right. \end{align} in an open, bounded domain $\Omega\subset\mathbb{R}^n$, $n\geq 2$ with smooth boundary $\partial\Omega$. Assume the parameters $d_1$, $d_2$, $d_3$, $\chi$, $\xi$, $\alpha$, $\beta$ and $\mu$ are positive constants, initial data $(u_0, v_0, w_0)$ are nonnegative and the function $f(u)\leq K u^l\in C^1([0, \infty))$ for some $K, l>0$. Under appropriate conditions on the parameter $k$, $l$ and $m$ we show that the above problem admits a unique globally bounded classical solution. Further, to illustrate the analytical results, some of numerical examples are provided.