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The initial-value problem for the cubic-quintic NLS with non-vanishing boundary conditions (1702.04413v2)
Published 14 Feb 2017 in math.AP
Abstract: We consider the initial-value problem for the cubic-quintic NLS [ (i\partial_t+\Delta)\psi=\alpha_1 \psi-\alpha_{3}\vert \psi\vert2 \psi+\alpha_5\vert \psi\vert4 \psi ] in three spatial dimensions in the class of solutions with $|\psi(x)|\to c >0$ as $|x|\to\infty$. Here $\alpha_1$, $\alpha_3$, $\alpha_5$ and $c$ are such that $\psi(x)\equiv c$ is an energetically stable equilibrium solution to this equation. Normalizing the boundary condition to $\psi(x)\to 1$ as $|x|\to\infty$, we study the associated initial-value problem for $u=\psi-1$ and prove a scattering result for small initial data in a weighted Sobolev space.