A fractional attraction-repulsion chemotaxis system with time-space dependent growth source and nonlinear productions

Abstract

This paper studies a fractional attraction-repulsion system with time-space dependent growth source and nonlinear productions: \begin{equation*} \left\{ \begin{aligned}\label{1.1} &u_t = -(-Δ)^αu - χ_1 \nabla \cdot (u \nabla v_1) + χ_2 \nabla \cdot (u \nabla v_2) + a(x,t)u - b(x,t)u^γ, &x \in \mathbb{R}^N, \, t > 0, \\ &0 = Δv_1 - λ_1 v_1 + μ_1 u^k, &x \in \mathbb{R}^N, \, t > 0, \\ &0 = Δv_2 - λ_2 v_2 + μ_2 u^k, &x \in \mathbb{R}^N, \, t > 0. \end{aligned} \right. \end{equation*} We first establish the global boundedness of classical solutions with nonnegative bounded and uniformly continuous initial data in two different cases: ${\hat{I}}^3\ge k+1$ and ${\hat{I}}^3<k+1$, respectively. For a fixed ${\hat{I}}^3$, when $k$ exceeds the critical value ${\hat{I}}^3-1$, a larger $b$ must be chosen to suppress the blow-up of the solution. Moreover, we show the persistence of the global solutions for both cases ${\hat{I}}^3=k+1$ and ${\hat{I}}^3\ne k+1$.