Global boundedness of the chemotaxis system with weakly singular sensitivity and nonlocal term in any dimension

Abstract

This paper is concerned with the parabolic-elliptic chemotaxis system involving weakly singular sensitivity and a nonlocal source: $u_t=Δu-χ\nabla\cdot\left(\frac{u}{v^k}\nabla v\right) +u^α\left(r-μ\int_Ωu^β\,dx\right)$ and $0=Δv-v+u^γ$ under homogeneous Neumann boundary conditions in a smooth bounded domain \(Ω\subset\mathbb{R}^N\) with \(N\ge1\), where \(χ,r,μ,γ>0\), \(k\in(0,1)\) and \(α,β\ge1\). In view of the enhanced aggregation induced by singular sensitivity and the suppression of excessive population growth by the nonlocal damping, we identify sufficient conditions under which solutions remain globally bounded. We show that classical solutions are globally bounded in the following cases: \par\smallskip \begin{center} \small \setlength{\tabcolsep}{5pt} \setlength{\arrayrulewidth}{0.3pt} \renewcommand{\arraystretch}{1.25} \begin{tabular}{c|c|c|c} \multirow{2}{*}{$β>1$} & \multirow{2}{*}{$γ=1$} & $N=1$ & $1\leqα<1+2β$ \\ \cline{3-4} & & $N\geq2$ & $\begin{gathered} 1\leqα<2,\quad α+β>2+\tfrac{N}{2},\\[-0.5mm] \text{or}\quad 2\leqα<1+\tfrac{2β}{N} \end{gathered}$ \\ \hline \multirow{2}{*}{$β=1$} & $γ=1$ & $N=1$ & \multirow{2}{*}{ $\begin{array}{l@{\quad}l@{\quad}l} \text{Case 1:} & 1\leqα<1+\tfrac{2}{N} & \text{if}\quad m_0<\tfrac{r}μ,\\[4pt] \text{Case 2:} & α\geq1 & \text{if}\quad m_0\geq\tfrac{r}μ \end{array}$ } \\ \cline{2-3} & $0<γ<\tfrac{2}{N}$ & $N\geq2$ & \\ \end{tabular} \end{center} \par \smallskip \noindent Here \(m_0:=\int_Ωu_0\) denotes the initial total mass. It is worth noting that both the uniform-in-time \(L^p\)-estimate and the \(L^\infty\)-bound obtained by Moser iteration are derived without first establishing a uniform positive lower bound for \(v\).