Global boundedness and asymptotic stability of the Keller-Segel system with logistic-type source in the whole space

TL;DR

This paper studies the Keller-Segel chemotaxis system with a logistic source term in the whole space, establishing conditions for global boundedness and analyzing the long-term behavior of solutions.

Contribution

It provides new results on the global boundedness and asymptotic stability of solutions to the Keller-Segel system with logistic growth in unbounded domains.

Findings

Global boundedness of solutions for >1

Asymptotic stability of positive equilibria for  in (1,2)

Long-term behavior characterized in unbounded space

Abstract

In this paper, we investigate the Cauchy problem of the parabolic-parabolic Keller-Segel system with the logistic-type term $au-bu^\gamma$ on $\mathbb{R}^N, N\geq2$. We discuss the global boundedness of classical solutions with nonnegative bounded and uniformly continuous initial functions when $\gamma>1$. Moreover, based on the persistence of classical solution we show the large time behavior of the positive constant equilibria with strictly positive initial function in the case of $\gamma\in(1,2)$.