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广义Sasa-Satsuma 呈在半直线上的初边值问题

来源:用户上传      作者:董凤娇 胡贝贝

  摘要:本文基于Fokas统一变换方法分析了广义Sasa-Satsuma方程在半直线上的初边值问题.假设广义S asa-Satsuma方程的解u(x,t)存在,证明了其初边值问题的解可用复谱参数λ平面上的3×3矩阵Riemann-Hilbert问题的形式解唯一表示.
  关键词:Riemann-Hilbert问题; 广义Sasa-Satsuma方程; 初边值问题; Fokas统一变换
  中图分类号:0175.29
  文献标志码:A
  DOI: 10.3969/j.issn.1000-5641.2019.04.004
  0 引言
  自Gardner, Green,Kruskal,Miura发现了反散射变换以来,一直到20世纪90年代,反散射变换几乎只是用来分析纯初值问题,但是在现实自然界中,越来越多的自然现象需要考虑边值条件,这样就自然地需要考虑初边值问题来取代初值问题.1997年,Fokas[1]基于反散射变换的思想首次提出了统一变换方法,很好地求解了可积方程的初边值问题.在过去的20年里,该方法已经用来分析了一些具有2x2矩阵Lax对的重要可积方程的初边值问题[2-5].就像全直线上的反散射方法一样,Fokas方法也是将初边值问题的解表示成相应的Riemann-Hilbert问题的解.2012年,Lenells[6]首次将此方法推广到3x3矩阵可积方程,并且研究了Degasperis-Procesi方程在半直线上的初边值问题[7]在这之后,越来越多的学者开始关注Riemann-Hilbert問题,使得许多与高阶矩阵谱问题相关的可积方程初边值问题得以研究,比如,Novikov方程[8]、Sasa-Stsuma方程[9]、耦合NLS方程等[11-12],作者在这方面也做了一些工作[13-16].
  众所周知,非线性薛定谔方程
  4 结论
  在本文中,我们构造了一个新的双模耦合KdV方程,一方面,通过简化的Hirota方法和Cole-Hopf变换,对于特殊的α、β值可得到该方程的孤子解,但对于一般的α、β值,孤子解是否存在,我们还不能确定.另一方面,通过不同的函数展开法,对于一般的α、β值,我们得到了该方程的其他精确解.
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