On the blow-up solutions for the fractional nonlinear Schrödinger equation with combined power-type nonlinearities

Abstract

This paper is devoted to the analysis of blow-up solutions for the fractional nonlinear Schrödinger equation with combined power-type nonlinearities $i\partial_t u-(-Δ)^su+λ_1|u|^{2p_1}u+λ_2|u|^{2p_2}u = 0, $ where $ 0<p_1<p_2<\frac{2s}{N-2s}$ . Firstly, we obtain some sufficient conditions about existence of blow-up solutions, and then derive some sharp thresholds of blow-up and global existence by constructing some new estimates. Moreover, we find the sharp threshold mass of blow-up and global existence in the case $ 0<p_1<\frac{2s}{N}$ and $p_2 = \frac{2s}{N}$ . Finally, we investigate the dynamical properties of blow-up solutions, including $L^2$-concentration, blow-up rate and limiting profile.