Free boundary problems for the diffusive competition system in higher dimension with sign-changing coefficients

In this article, we investigate two free boundary problems for a Lotka–Volterra competition system in a higher space dimension with sign-changing coefficients. One may be viewed as describing how two competing species invade if they occupy an initial region; the other describes the dynamical process of a new competitor invading into the habitat of a native species. For simplicity, it is assumed that the environment is radially symmetric. The main purpose of this article is to understand the asymptotic behaviour of competing species spreading via a free boundary. We derive some sufficient conditions for species spreading success and spreading failure. Moreover, for the case of successful spreading, we provide the long-time behaviour of solutions to free boundary problems.