Strichartz estimates to fractional Schrödinger equations

Abstract

In this paper, we firstly study Strichartz estimates $\|e^{it D^α} u_0\|_{L_t^q(\mathbb{R};L_x^r(\mathbb{R}^d))}\leq C(d,α,q,r,s)\|u_0\|_{\dot{H}^s}.$ We show some counterexamples for $(q,r) = (2,\infty)$. Then we consider the embedding $X^{s,b}_α\hookrightarrow L_t^q(\mathbb{R};L_x^r(\mathbb{R}^d))$, where $\|u\|_{X_α^{s,b}}:=\|\langleξ\rangle^s\langle τ-|ξ|^α\rangle^b\hat{u}(τ,ξ)\|_{L^2_{τ,ξ}}$. We present the necessary and sufficient conditions for this embedding.