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arXiv 0704.2121math.APmath-phmath.MPnlin.PS
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周期势nonlinear elliptic问题耦合模近似的证明

Justification of the coupled-mode approximation for a nonlinear elliptic problem with a periodic potential

Dmitry Pelinovsky, Guido Schneider

摘要:

耦合模系统在物理学文献中被用来简化具有小周期势的非线性Maxwell和Gross-Pitaevskii方程,并通过包含双曲函数的解析表达式来近似称为间隙孤子的局部解。我们证明使用的一维固定耦合模系统的相关椭圆问题,采用的方法,李雅普诺夫-施密特减少傅立叶空间。特别地,证明了周期解/反周期解和衰减解的存在性,并将误差项控制在适当的范数范围内.多维固定耦合模系统的使用是合理的周期/反周期解的分岔分析在一个小的多维周期电位。

英文摘要:

Coupled-mode systems are used in physical literature to simplify the nonlinear Maxwell and Gross-Pitaevskii equations with a small periodic potential and to approximate localized solutions called gap solitons by analytical expressions involving hyperbolic functions. We justify the use of the one-dimensional stationary coupled-mode system for a relevant elliptic problem by employing the method of Lyapunov--Schmidt reductions in Fourier space. In particular, existence of periodic/anti-periodic and decaying solutions is proved and the error terms are controlled in suitable norms. The use of multi-dimensional stationary coupled-mode systems is justified for analysis of bifurcations of periodic/anti-periodic solutions in a small multi-dimensional periodic potential.

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