Fractional and anisotropic Gagliardo--Nirenberg inequalities with applications

Abstract

In this article, we first investigate the necessary and sufficient conditions on the ranges of $s,s_1,s_2\in R$, $1\leq p_1,p_2,q\leq \infty$, $\theta_1,\theta_2\geq 0$ for the validity of the fractional Gagliardo--Nirenberg inequalities $$\|D^su\|_{L^q(R^d)}\lesssim \|D^{s_1}u\|_{L^{p_1}(R^d)}^{\theta_1}\|D^{s_2}u\|_{L^{p_2}(R^d)}^{\theta_2}.$$ Secondly, we consider the anisotropic Gagliardo--Nirenberg inequalities $$\|u\|_{L^q(R^d)}\lesssim \|u\|_{L^{p_0}(R^d)}^{\theta_0} \prod_{j=1}^n\|D_{x_j}^{s_j}u\|_{L^{p_j}(R^d)}^{\theta_j}.$$ We show the sharp conditions of these inequalities except ``one" case. Finally, we establish the profile decomposition associated with the above inequalities when $p_j = 2$, $0\leq j\leq n$. Using these results, we establish existence of extremizers and construct soliton solutions of relevant dispersive equations.