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arXiv 1706.06950math.APmath.FA
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空间周期NLS的不稳定归一化驻波

Unstable normalized standing waves for the space periodic NLS

Nils Ackermann, Tobias Weth

摘要:

研究了具有周期位势$V$的定常非线性薛定谔方程$-Δu+ V(x)u- f(u) = λu$在给定$L^2$范数下多凸点解的存在性和稳定性.为此,我们引入了一个新的非简并条件,并开发新的叠加技术,允许匹配的$L^2$约束。这样我们就得到了驻值问题无穷多个几何相异解的存在性。然后,我们计算这些解决方案的Morse指数相对于相关的$L^2$球的基本能量泛函的限制,我们显示了它们的轨道不稳定性相对于薛定谔流。我们的结果适用于这两个,质量亚临界和质量超临界制度。

英文摘要:

For the stationary nonlinear Schrödinger equation $-Δu+ V(x)u- f(u) = λu$ with periodic potential $V$ we study the existence and stability properties of multibump solutions with prescribed $L^2$-norm. To this end we introduce a new nondegeneracy condition and develop new superposition techniques which allow to match the $L^2$-constraint. In this way we obtain the existence of infinitely many geometrically distinct solutions to the stationary problem. We then calculate the Morse index of these solutions with respect to the restriction of the underlying energy functional to the associated $L^2$-sphere, and we show their orbital instability with respect to the Schrödinger flow. Our results apply in both, the mass-subcritical and the mass-supercritical regime.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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