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Stability of standing waves for a nonlinear Schrödinger equation wdelta potentialith a repulsive Dirac
January  2008, 21(1): 137-186. doi: 10.3934/dcds.2008.21.137

Schrödinger equations with a spatially decaying nonlinearity: Existence and stability of standing waves

 1 Station 8, IACS-FSB, EPFL, CH-1015, Lausanne, Switzerland, Switzerland

Received  January 2007 Published  February 2008

For $N\geq3$ and $p>1$, we consider the nonlinear Schrödinger equation

$i\partial_{t}w+\Delta_{x}w+V(x) |w| ^{p-1}w=0\text{ where }w=w(t,x):\mathbb{R}\times\mathbb{R}^{N}\rightarrow\mathbb{C}$

with a potential $V$ that decays at infinity like $| x|^{-b}$ for some $b\in (0,2)$. A standing wave is a solution of the form

$w(t,x)=e^{i\lambda t}u(x)\text{ where }\lambda>0\text{ and }u:\mathbb{R}^{N}\rightarrow\mathbb{R}.$

For $1 < p < 1+(4-2b)/(N-2)$, we establish the existence of a $C^1$-branch of standing waves parametrized by frequencies $\lambda$ in a right neighbourhood of $0$. We also prove that these standing waves are orbitally stable if $1 < p < 1+(4-2b)/N$ and unstable if $1+(4-2b)/N < p < 1+(4-2b)/(N-2)$.

Citation: François Genoud, Charles A. Stuart. Schrödinger equations with a spatially decaying nonlinearity: Existence and stability of standing waves. Discrete & Continuous Dynamical Systems - A, 2008, 21 (1) : 137-186. doi: 10.3934/dcds.2008.21.137
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