Many synchronized vector solutions for a Bose–Einstein system

Source abstract

Abstract This paper is concerned with the following nonlinear Schrödinger system in ${\mathbb R}^3$ $$\left\{ {\beging{matrix}{ {-\Delta u + (1 + \alpha P(x))u = \mu u^3 + \beta uv^2,} \hfill & {x\in {\open R}^3,} \hfill \cr {-\Delta v + (1 + \alpha Q(x))u = \nu v^3 + \beta u^2v,} \hfill & {x\in {\open R}^3,} \hfill \cr {u,v > 0,} \hfill & {x\in {\open R}^3,} \hfill \cr } } \right.$$ where $\beta \in {\mathbb R}$ is a coupling constant, $\mu ,\nu$ are positive constants, P , Q are weight functions decaying exponentially to zero at infinity, α can be regarded as a parameter. This type of system arises, in particular, in models in Bose–Einstein condensates theory and Kerr-like photo refractive media. We prove that, for any positive integer k > 1, there exists a suitable range of α such that the above problem has a non-radial positive solution with exactly k maximum points which tend to infinity as $\alpha \to +\infty$ (or $0^+$ ). Moreover, we also construct prescribed number of sign-changing solutions.