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arXiv 0906.0131nlin.SI
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NLS模型中的非零边界条件和暗孤子

Nonvanishing boundary conditions and dark solitons in the NLS model

L. F. dos Santos, H. Blas, M. J. B. F. da Silva

摘要:

我们在混合敷料变换和$τ$函数方法的背景下考虑NLS模型[6,7,27]的非零边界条件(NVBC)。为了编写一个合适的形式来处理非零边界条件的NLS模型,它引入了一个新的谱参数,以这种方式,通常的NLS参数将取决于仿射参数通过所谓的Zukowsky函数。在敷料变换的情况下,仿射参数的引入避免了通常的NLS谱参数的某些黎曼单的构造。在这种方法中,我们引入了一个新的谱参数定义的拉克斯对,并通过Dressing变换方法得到了相应的NVBC NLS $τ$函数。我们明确地构造了一个和两个暗孤子解。

英文摘要:

We consider non-vanishing boundary conditions (NVBC) for the NLS model [6,7,27] in the context of the hybrid dressing transformation and $τ$-function approach. In order to write the NLS model in a suitable form to deal with non-vanishing boundary conditions it is introduced a new spectral parameter in such a way that the usual NLS parameter will depend on the affine parameter through the so-called Zukowsky function. In the context of the dressing transformation the introduction of the affine parameter avoids the construction of certain Riemann sheets for the usual NLS spectral parameter. In this way one introduces a Lax pair defined for the new spectral parameter and the relevant NVBC NLS $τ$ functions are obtained by the dressing transformation method. We construct the one and two dark-soliton solutions explicitly.

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