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arXiv 0711.3264math.APmath-phmath.MP
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半线上聚焦NLS方程的周期边界条件问题

The Focusing NLS Equation on the Half-Line with Periodic Boundary Conditions

S. Kamvissis, A. S. Fokas

AI总结:

研究半线上聚焦NLS方程的周期边界条件问题,通过Riemann-Hilbert问题构造解并分析其性质。

摘要:

我们考虑了半线上聚焦NLS方程的Dirichlet问题,给定Schwartz初始数据和边界数据q(0,t),等于在x=0处的周期边界数据a e^{2iωt + i ε}的指数衰减扰动u(t)。已知从PDE理论可知,该问题具有唯一解(对于固定的初始数据和固定的u)。另一方面,相关的反散射变换形式法则涉及x=0处的Neumann边界值。因此,实现该形式法则需要理解所谓的

英文摘要:

We consider the Dirichlet problem for the focusing NLS equation on the half-line, with given Schwartz initial data and boundary data $q(0,t)$ equal to an exponentially decaying perturbation $u(t)$ of the periodic boundary data $ a e^{2iωt + i ε}$ at $x=0.$ It is known from PDE theory that this problem admits a unique solution (for fixed initial data and fixed $u$). On the other hand, the associated inverse scattering transform formalism involves the Neumann boundary value for $x=0$. Thus the implementation of this formalism requires the understanding of the "Dirichlet-to-Neumann" map which characterises the associated Neumann boundary value. We consider this map in an indirect way: we postulate a certain Riemann-Hilbert problem, on a specified contour but with partially unspecified jump data of some generality, and then prove that the solution of the initial-boundary value problem for the focusing NLS constructed through this Riemann-Hilbert problem satisfies all the required properties: the data $q(x,0)$ are Schwartz and $q(0,t)-a e^{2iωt + i ε}$ is exponentially decaying. More specifically, we focus on the case $-3a^2 < ω< a^2.$ By considering a large class of appropriate scattering data for the t-problem, we provide solutions of the above Dirichlet problem such that the data $q_x(0,t)$ is given by an exponentially decaying perturbation of the function $2iab e^{2iωt + i ε},$ where $ω= a^2-2b^2,~~b>0$.

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