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arXiv 0906.0375math.AP
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三维饱和非线性薛定谔方程中最小质量孤子的一类稳定扰动

A class of stable perturbations for a minimal mass soliton in three dimensional saturated nonlinear Schrödinger equations

Jeremy Marzuola

摘要:

在这个结果中,我们发展了\cite{KS1}和\cite{BW}的技巧,以便在$\reals^3$中确定饱和聚焦非线性薛定谔方程{c} iu_t + Δu + β(|u| ^2)u = 0 u(0,x)= u_0(x)的最小质量孤子解的一类稳定扰动.通过投影到$\mathcal{H}$的连续谱的子空间中,如\cite{S1},\cite{KS1},我们能够使用类似于\cite{BW}的压缩映射,以证明存在形式为e^{i λ_{ \min } t}(R_{min} + e^{i \mathcal{H} t} t + w(x,t))的解,其中$e^{i \mathcal{H} t} ϕ+ w(x,t)$分散为$t \to \infty$。因此,我们有很长的时间持续的孤子的最小质量,尽管事实上,这些解决方案被证明是非线性不稳定的\cite{CP1}。

英文摘要:

In this result, we develop the techniques of \cite{KS1} and \cite{BW} in order to determine a class of stable perturbations for a minimal mass soliton solution of a saturated, focusing nonlinear Schrödinger equation {c} i u_t + Δu + β(|u|^2) u = 0 u(0,x) = u_0 (x), in $\reals^3$. By projecting into a subspace of the continuous spectrum of $\mathcal{H}$ as in \cite{S1}, \cite{KS1}, we are able to use a contraction mapping similar to that from \cite{BW} in order to show that there exist solutions of the form e^{i λ_{\min} t} (R_{min} + e^{i \mathcal{H} t} ϕ+ w(x,t)), where $e^{i \mathcal{H} t} ϕ+ w(x,t)$ disperses as $t \to \infty$. Hence, we have long time persistance of a soliton of minimal mass despite the fact that these solutions are shown to be nonlinearly unstable in \cite{CP1}.

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