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.
Consider the focussing cubic nonlinear Schrödinger equation in $R^3$: $$ iψ_t+Δψ= -|ψ|^2 ψ. $$ It admits special solutions of the form $e^{itα}ϕ$, where $ϕ$ is a Schwartz function and a positive ($ϕ>0$) solution of $$ -Δϕ+ αϕ= ϕ^3. $$ The space of all such solutions, together with those obtained from them by rescaling and applying phase and Galilean coordinate changes, called standing waves, is the eight-dimensional manifold that consists of functions of the form $e^{i(v \cdot + Γ)} ϕ(\cdot - y, α)$. We prove that any solution starting sufficiently close to a standing wave in the $Σ= W^{1, 2}(…
Bilinear Eigenfunction Estimates and the Nonlinear Schroedinger Equation on Surfaces
研究了紧致曲面上的三次非线性薛定谔方程。在球面$\mathbb{S}^2$和更一般的Zoll曲面上,我们证明了对于$s>1/4$,NLS在球面上是尖锐的$H^s$中是一致适定的.在我们的证明的主要成分是一个尖锐的双线性估计拉普拉斯光谱投影紧凑的表面。本文研究了一个曲面上的非线性薛定谔方程(NLS),在$\mathbb{S}^2$上,以及在Zoll曲面上的一般性,在$s>1/4$上,NLS在$H^s$中是均匀的,在曲面上是最优的。Le principal ingrédient de notre demonstration est une estimation bilinéaire pour les projectivespectraux du Laplacien sur une surface acoustic.
On the 2d Zakharov system with L^2 Schrödinger data
我们证明了L^2 x H^{-1/2} x H^{-3/2}中具有大初始数据的二维Zakharov系统的局部时间适定性。这是最优正则性的空间,因为在基于L^2的索伯列夫尺度下,对于任何更粗糙的空间对,数据到解的映射在原点处都不平滑。此外,它是一个自然的空间柯西问题的亚音速极限方程,即聚焦立方非线性薛定谔方程。我们得到的存在时间仅取决于初始数据的相应范数--这一结果对于二维的三次非线性薛定谔方程来说是错误的--并且它是最优的,因为Glangetas-Merle的解在那时爆炸。
Weakly nonlinear energy transfer between normal modes of strongly resonant PDEs is captured by the corresponding effective resonant systems. In a previous article, we have constructed a large class of such resonant systems (with specific representatives related to the physics of Bose-Einstein condensates and Anti-de Sitter spacetime) that admit special analytic solutions and an extra conserved quantity. Here, we develop and explore a complex plane representation for these systems modelled on the related cubic Szego and LLL equations. To demonstrate the power of this representation, we use it t…
Scattering Theory For 3D Cubic Damped Magnetic Schrödinger Equation
Ikerbasque, Basque Foundation for Science(Ikerbasque,巴斯克科学基金会);Departamento de Matemáticas, Euskal Herriko Unibertsitatea(EHU)(巴斯克国立大学数学系);BCAM - Basque Center for Applied Mathematics(巴斯克应用数学中心);Department of Mathematics, Graduate School of Science, The University of Osaka(大阪大学理学研究科数学系);The Graduate School of China Academy of Engineering Physics(中国工程物理研究院研究生院);Institute of Applied Physics and Computational Mathematics(应用物理与计算力学研究所);National Key Laboratory of Computational Physics(计算物理学国家重点实验室)