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arXiv 0902.1643math.APmath-phmath.MP
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三维三次聚焦Schroedinger方程的临界中心稳定流形

A Critical Centre-Stable Manifold for the Cubic Focusing Schroedinger Equation in Three Dimensions

Marius Beceanu

摘要:

考虑在R^3中具有立方非线性项的H^{1/2}-临界Schroedinger方程,i \partial_t <$+ Δ <$+| ψ| ^2 = 0。它存在一个称为孤子e^{i(Γ+ |v| ^2 + α^2 t)}<$(x-2 tv-D,α)的八维周期解流形,其中<$(x,α)是半线性椭圆型方程-Δ <$+ α^2 <$=<$^3的正基态解。我们证明了在孤子流形的邻域内,存在一个H^{1/2}实解析流形N,它是Schroedinger方程的渐近稳定解,也就是说它们是一个运动孤子和一个色散项之和.此外,从N开始的解对所有正时间和某个有限负时间保持在N上,并且N可以被识别为该方程的中心稳定流形。这个证明是基于调制方法,该方法由索弗和温斯坦提出,施拉格将其应用于L^2超临界情形。新的元素包括一个不同的线性化和新的Schroedinger方程的Schroedinger型估计。主要结果取决于一个频谱假设有关的情况下,嵌入的特征值。我们还建立了与时间相关和与时间无关的线性薛定谔方程解的几个新估计,这些估计在比以前已知的更尖锐或更一般的条件下成立。其中一些估计是基于一种新的方法,利用维纳定理的上下文中的函数空间。

英文摘要:

Consider the H^{1/2}-critical Schroedinger equation with a cubic nonlinearity in R^3, i \partial_t ψ+ Δψ+ |ψ|^2 ψ= 0. It admits an eight-dimensional manifold of periodic solutions called solitons e^{i(Γ+ vx - t|v|^2 + α^2 t)} ϕ(x-2tv-D, α), where ϕ(x, α) is a positive ground state solution of the semilinear elliptic equation -Δϕ+ α^2ϕ= ϕ^3. We prove that in the neighborhood of the soliton manifold there exists a H^{1/2} real analytic manifold N of asymptotically stable solutions of the Schroedinger equation, meaning they are the sum of a moving soliton and a dispersive term. Furthermore, a solution starting on N remains on N for all positive time and for some finite negative time and N can be identified as the centre-stable manifold for this equation. The proof is based on the method of modulation, introduced by Soffer and Weinstein and adapted by Schlag to the L^2-supercritical case. Novel elements include a different linearization and new Strichartz-type estimates for the linear Schroedinger equation. The main result depends on a spectral assumption concerning the absence of embedded eigenvalues. We also establish several new estimates for solutions of the time-dependent and time-independent linear Schroedinger equation, which hold under sharper or more general conditions than previously known. Several of these estimates are based on a new approach that makes use of Wiener's Theorem in the context of function spaces.

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