Strong instability of standing waves for nonlinear Schr\"odinger equations with harmonic potential
Strong instability of standing waves for nonlinear Schr\"odinger equations with harmonic potential
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DOI:
10.1619/fesi.61.135
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发表时间:
2016-04
期刊:
影响因子:
--
通讯作者:
Masahito Ohta
中科院分区:
文献类型:
--
作者:
Masahito Ohta
We study strong instability of standing waves $e^{i\omega t} \phi_{\omega}(x)$ for nonlinear Schr\"odinger equations with $L^2$-supercritical nonlinearity and a harmonic potential, where $\phi_{\omega}$ is a ground state of the corresponding stationary problem. We prove that $e^{i\omega t} \phi_{\omega}(x)$ is strongly unstable if $\partial_{\lambda}^2 E(\phi_{\omega}^{\lambda}) |_{\lambda=1}\le 0$, where $E$ is the energy and $v^{\lambda}(x)=\lambda^{N/2} v(\lambda x)$ is the $L^2$-invariant scaling.