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arXiv 2104.07301math.APnlin.SI
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高阶离散谱存在时孤子区聚焦非线性薛定谔方程的长时间渐近性

Long time asymptotics for the focusing nonlinear Schrödinger equation in the solitonic region with the presence of high-order discrete spectrum

Zhaoyu Wang, Meisen Chen, Engui Fan

摘要:

本文利用$\bar{\partial}$最速下降法研究了具有非一般加权Sobolev初值的聚焦非线性薛定谔(fNLS)方程的初值问题,该方程允许高阶离散谱的存在.更准确地说,我们将特征的本征函数和散射系数的高阶极点的存在下的属性;进一步,我们制定了适当的扩大RH问题;经过一系列的变形,RH问题转化为一个可解的模型。最后,我们得到了fNLS方程解在任意固定时空锥中的渐近展开式:%为$t \to \infty$,\begin{equation*} \mathcal{S}(x_1,x_2,v_1,v_2):=\left\lbrace (x,t)\in \mathbb{R}^2: x=x_0+vt, \ x_0\in[x_1,x_2]\text{, }v\in[v_1,v_2]\right\rbrace. \end{equation*}。观察结果表明,在这种情况下fNLS方程的解满足孤子分辨猜想。该解的首阶项中包含一个高阶孤子,其参数通过连续谱上的光锥和光辐射相互作用受孤子相互作用的影响。该结果的误差项可达由相应的$\bar{\partial}$方程导出的$\mathcal{O}(t^{-3/4})$。

英文摘要:

In this paper, we use the $\bar{\partial}$ steepest descent method to study the initial value problem for focusing nonlinear Schrödinger (fNLS) equation with non-generic weighted Sobolev initial data that allows for the presence of high-order discrete spectrum. More precisely, we shall characterize the properties of the eigenfunctions and scattering coefficients in the presence of high-order poles; further we formulate an appropriate enlarged RH problem; after a series of deformations, the RH problem is transformed into a solvable model. Finally, we obtain the asymptotic expansion of the solution of the fNLS equation in any fixed space-time cone: %as $t \to \infty$, \begin{equation*} \mathcal{S}(x_1,x_2,v_1,v_2):=\left\lbrace (x,t)\in \mathbb{R}^2: x=x_0+vt, \ x_0\in[x_1,x_2]\text{, }v\in[v_1,v_2]\right\rbrace. \end{equation*} Observing the result indicates that the solution of fNLS equation in this case satisfies the soliton resolution conjecture. The leading order term of this solution includes a high-order pole-soliton whose parameters are affected by soliton-soliton interactions through the cone and soliton-radiation interactions on continuous spectrum. The error term of this result is up to $\mathcal{O}(t^{-3/4})$ which comes from the corresponding $\bar{\partial}$ equation.

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