Existence and large time behavior for a Keller–Segel model with gradient dependent chemotactic sensitivity
Volume 130 / 2023
Abstract
The purpose of this paper is to study the chemotaxis growth system in a smooth bounded domain \Omega \subset \mathbb R^n, n\geq 2 with nonnegative initial data and homogeneous boundary conditions of Neumann type for u,v and w. We will show that the problem admits a global weak solution when p\in (1,\frac{n\alpha +2n-6\alpha +4}{2n-6\alpha +4}), 3\alpha -2\leq n\leq 4\alpha -2, and when p \gt 1, n \lt 3\alpha -2. What is more, under appropriate conditions, this global solution with nonnegative initial data (u_0,v_0,w_0) eventually becomes a classical solution of the system and satisfies \begin{align*} u\rightarrow (a_{+}/b)^{\frac{1}{\alpha -1}},\quad v\rightarrow (a_{+}/b)^{\frac{1}{\alpha -1}},\quad w\rightarrow(a_{+}/b)^{\frac{1}{\alpha -1}}\quad\ \text{in}\quad L^{\infty}(\Omega), \end{align*} as t\rightarrow \infty.