The paper is devoted to the stability problem for the nonlinear Schrödinger equation \[ i\vec\psi_t= [- \partial^2_x+ V(\psi_1 \psi_2)] \sigma_3 \vec\psi, \] where \(\vec\psi={\psi_1(x,t)\choose\psi_2(x,t)}\), \(\sigma_3=\left(\begin{smallmatrix} 1 & 0\\ 0 & -1\end{smallmatrix}\right)\) and \(V\) is a real-valued function with \[ \begin{aligned} V(\xi) & \geq - V_1 \xi^q,\quad V_1> 0,\quad \xi\geq 1,\quad q< 2,\\ V(\xi) & = V_2 \xi^p(1+ O(\xi)),\quad p> 0,\quad \xi\to 0.\end{aligned} \] {}.
For the entire collection see [Zbl 0824.00037].