Global existence, blowup phenomena, and asymptotic behavior for quasilinear Schr\"{o}dinger equations

In this paper, we study the Cauchy problem of the quasilinear Schr"{o}dinger equation \begin{equation*} \left{ \begin{array}{lll} iu_t=\Delta u+2uh’(|u|^2)\Delta h(|u|^2)+F(|u|^2)u \quad {\rm for} \ x\in $\mathbb{R}$^N, \ t>0\ u(x,0)=u_0(x),\quad x\in $\mathbb{R}$^N. \end{array}\right. \end{equation*} Here $h(s)$ and $F(s)$ are some real-valued functions, with various choices for models from mathematical physics. We examine the interplay between the quasilinear effect of $h$ and nonlinear effect of $F$ for the global existence and blowup phenomena. We provide sufficient conditions on the blowup in finite time and global existence of the solution. In some cases, we can deduce the watershed from these conditions. In the focusing case, we construct the sharp threshold for the blowup in finite time and global existence of the solution and lower bound for blowup rate of the blowup solution.