Endpoint bounds for the Born-Jordan distribution

RESUMO

For $d\geqslant3$, let $p^*=\frac{2d}{d-2}$. We prove that the Born-Jordan distribution maps $L^{2,p^*}(\mathbb R^d)\times L^{2,p^*}(\mathbb R^d)$ boundedly into $L^{p^*}(\mathbb R^{2d})$. The Lorentz index $p^*$ cannot be increased in either variable. In particular, this gives the endpoint $L^2\times L^2\to L^{p^*}$ estimate, settling the critical boundedness problem raised by Stra, Svela, and Trapasso \cite{SST26}.