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一维和二维周期非线性薛定谔方程的整体适定性

Global Well-Posedness for a periodic nonlinear Schrödinger equation in 1D and 2D

Daniela De Silva, Nataša Pavlović, Gigliola Staffilani, Nikolaos Tzirakis

摘要:

研究了具有周期边界数据的$L^{2}$临界半线性薛定谔方程的初值问题.我们证明了该问题是全局适定的$H^{s}({\Bbb T^{d}})$,$s>4/9$和$s>2/3$分别在1D和2D,确认在2D的声明Bourgain在\cite{bo2}。我们使用“$I$方法”。该方法允许引入能量泛函的修改,该能量泛函对于低于$H^{1}({\Bbb T^{d}})$阈值的初始数据被很好地定义。在证明的主要成分是一个“细化”的哈茨的估计,适用于解决方案定义的重新缩放空间,$\Bbb T^{d}_λ = \Bbb R^{d}/{λ\Bbb Z^{d}}$,$d=1,2$。

英文摘要:

The initial value problem for the $L^{2}$ critical semilinear Schrödinger equation with periodic boundary data is considered. We show that the problem is globally well posed in $H^{s}({\Bbb T^{d}})$, for $s>4/9$ and $s>2/3$ in 1D and 2D respectively, confirming in 2D a statement of Bourgain in \cite{bo2}. We use the ``$I$-method''. This method allows one to introduce a modification of the energy functional that is well defined for initial data below the $H^{1}({\Bbb T^{d}})$ threshold. The main ingredient in the proof is a "refinement" of the Strichartz's estimates that hold true for solutions defined on the rescaled space, $\Bbb T^{d}_λ = \Bbb R^{d}/{λ\Bbb Z^{d}}$, $d=1,2$.

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