On fractional Schrodinger systems of Choquard type

Abstract

In this article, we first employ the concentration compactness techniques to prove existence and stability results of standing waves for nonlinear fractional Schrödinger-Choquard equation \[ i\partial_tΨ+ (-Δ)^αΨ= a |Ψ|^{s-2}Ψ+λ\left( \frac{1}{|x|^{N-β}} \star |Ψ|^p \right)|Ψ|^{p-2}Ψ \ \ \mathrm{in}\ \mathbb{R}^{N+1}, \] where $N\geq 2$, $α\in (0,1)$, $β\in (0, N)$, $s\in (2, 2+\frac{4α}{N})$, $p\in [2, 1+\frac{2α+β}{N})$, and the constants $a, λ$ are nonnegative satisfying $a+λ> 0.$ We then extend the arguments to establish similar results for coupled standing waves of nonlinear fractional Schrödinger systems of Choquard type. The same argument works for equations with an arbitrary number of combined nonlinearities and when $|x|^{β-N}$ is replaced by a more general convolution potential $\mathcal{K}:\mathbb{R}^N\to [0, \infty)$ under certain assumptions. The same arguments can be applied and the results are identical for the case $α=1$ as well.