Critical Strichartz estimates for orthonormal systems

Abstract: Orthonormal Strichartz estimates for the free Schrödinger propagator take the form \begin{equation*} \left\Vert\sum_jλj\left|e^{itΔ}f_j\right|^2\right\Vert{L_t^\frac{q}{2}L_x^\frac{r}{2}(\mathbb{R}\times\mathbb{R}^d)}\lesssim\Vertλ\Vert_{\ell^α(\mathbb{C})} \end{equation*}for arbitrary orthonormal systems $(f_j)_j$ in the homogeneous Sobolev space $\dot{H}<sup>s(\mathbb{R}<sup>d)$. In the admissible region, the optimal range of $α$ has been established when $q\geq r/d&#39;$. For $d\geq2$ and $2<q<r/d'$, it has been an open question as to determine whether the estimate holds when $α=q/2$. We prove that the estimate holds in this critical case whenever $q=4$ and $r&lt;\infty$. Our approach is robust and we illustrate this by extending the result to fractional Schrödinger propagators.