Global well-posedness for a $L^2$-critical nonlinear higher-order Schrödinger equation

Abstract: We prove the global well-posedness for a $L^2$-critical defocusing cubic higher-order Schr\"odinger equation, namely [ i\partial_t u + \Lambda^k u = -|u|^2 u, ] where $\Lambda=\sqrt{-\Delta}$ and $k\geq 3, k \in \mathbb{Z}$ in $\mathbb{R}^k$ with initial data $u_0 \in H^\gamma, \gamma>\gamma(k):=\frac{k(4k-1)}{14k-3}$.