Minimal energy solutions for repulsive nonlinear Schrödinger systems

In this paper we establish existence and nonexistence results concerning fully nontrivial minimal energy solutions of the nonlinear Schrödinger system−Δu+u=|u|2q−2u+b|u|q−2u|v|qin Rn,−Δv+ω2v=|v|2q−2v+b|u|q|v|q−2vin Rn. We consider the repulsive case b<0b<0 and assume that the exponent q   satisfies 1