余切丛约化与Poincaré-Birkhoff normal forms
Cotangent bundle reduction and Poincaré-Birkhoff normal forms
摘要：
本文研究了具有自由李群作用的余切丛的约化空间的正则坐标的一个系统而自然的构造。正则坐标使我们能够使用标准算法计算相对平衡的庞加莱-伯克霍夫标准形。详细研究了具有对称性的简单力学系统的情况。作为例子，我们计算了具有Morse型势的三体系统的拉格朗日等边三角形位形和双球摆的伸展位形的Poincar{é}-Birkhoff规范形。
英文摘要：
In this paper we study a systematic and natural construction of canonical coordinates for the reduced space of a cotangent bundle with a free Lie group action. The canonical coordinates enable us to compute Poincar{é}-Birkhoff normal forms of relative equilibria using standard algorithms. The case of simple mechanical systems with symmetries is studied in detail. As examples we compute Poincar{é}-Birkhoff normal forms for a Lagrangian equilateral triangle configuration of a three-body system with a Morse-type potential and the stretched-out configuration of a double spherical pendulum.
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