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arXiv math-ph/0611061math-phcond-mat.othermath.APmath.MP
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非线性Schroedinger方程的容许变换与正规化类

Admissible Transformations and Normalized Classes of Nonlinear Schroedinger Equations

Roman O. Popovych, Michael Kunzinger, Homayoon Eshraghi

摘要:

基于微分方程的条件等价群和规范化类的新概念,对微分方程的群分类理论进行了分析、扩展和改进。提出了有效的新技术。利用这些结果,我们详尽地描述了一类非线性(1+1)维Schroedinger方程的容许点变换,特别是具有模非线性项和模势的非线性(1+1)维Schroedinger方程及其子类.然后,我们进行了一个完整的组分类在这个类中,表示它作为一个不相交的规范化子类的工会,并应用代数和兼容性的方法相结合。此外,我们还介绍了(1+2)维三次薛定谔方程的完全分类。所提出的方法可以应用于研究广泛的微分方程的对称性。

英文摘要:

The theory of group classification of differential equations is analyzed, substantially extended and enhanced based on the new notions of conditional equivalence group and normalized class of differential equations. Effective new techniques are proposed. Using these, we exhaustively describe admissible point transformations in classes of nonlinear (1+1)-dimensional Schroedinger equations, in particular, in the class of nonlinear (1+1)-dimensional Schroedinger equations with modular nonlinearities and potentials and some subclasses thereof. We then carry out a complete group classification in this class, representing it as a union of disjoint normalized subclasses and applying a combination of algebraic and compatibility methods. Moreover, we introduce the complete classification of (1+2)-dimensional cubic Schroedinger equations with potentials. The proposed approach can be applied to studying symmetry properties of a wide range of differential equations.

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