Boundedness and blow-up for a quasilinear Keller-Segel system with flux limitation and indirect signal production
Abstract
The quasilinear Keller-Segel system with flux limitation and indirect signal production u_t=\nabla\cdot\left(D(u)\nabla u\right) -\nabla\cdot\left(u(1+\left|\nabla v\right|^2)^\sigma\nabla v\right), &x\in\Omega, t>0, \\ 0=\Delta v-v+w,x\in\Omega, t>0, \\ w_t=-w+u,x\in\Omega, t>0, under homogeneous Neumann boundary conditions in a smooth bounded domain \Omega\subsetR^N is considered, where D(u)\simeq u^{m-1} as u\simeq\infty. We conclude that For N=1 and any \sigma\in\mathbb{R}, if m\geq0, the classical solution exists globally, and it is moreover bounded if m>0. However, if m<0 and \Omega is a ball, there exist radially symmetric initial data such that the classical solution exhibits finite-time blow-up.
For any N\geq2 and m>1-\frac{1}{N}, if \sigma\leq \frac{mN+2-2N}{2N-2}, the classical solution is global. Furthermore, if \sigma<\frac{mN+2-2N}{2N-2}, the corresponding solution is uniformly bounded.
For any N\geq2 and m<2-\frac{2}{N}, if \sigma>\max\left\{\frac{N}{2-2N},\frac{mN+2-2N}{2N-2}\right\} and \Omega is a ball, there exist radially symmetric initial data such that the classical solution blows up in finite time.
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