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arXiv math/0204198math.DSmath.AT
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中心构型、对称性和不动点

Central configurations, symmetries and fixed points

Davide L. Ferrario

摘要:

平面中心构型可以看作约化势的临界点或方程组的解。通过势关于SO(2)的齐性和不变性,可以看出中心组态的SO(2)轨道是适当映射f的不动点。本文的目的是定义这种映射,并利用拓扑不动点理论得到一些性质。利用不动点指标证明了共线构型的推广Moulton-Smale定理,并给出了三体中心构型个数的估计.著名的结果,如中心配置集的紧性,也可以在这个拓扑框架中以一种简单的方式得到证明。文末给出了具有牛顿位势的n个等质量平面中心位形的(数值)表,其中n=3,.,10.它们被计算为R^{2(n-2)}的适当自映射的不动点。

英文摘要:

Planar central configurations can be seen as critical points of the reduced potential or solutions of a system of equations. By the homogeneity and invariance of the potential with respect to SO(2), it is possible to see that the SO(2)-orbits of central configurations are fixed points of a suitable map f. The purpose of the paper is to define this map and to derive some properties using topological fixed point theory. The generalized Moulton-Smale theorem for collinear configurations is proved, together with some estimates on the number of central configurations in the case of 3 bodies, using fixed point indexes. Well-known results such as the compactness of the set of central configuration can also be proved in an easy way in this topological framework. At the end of the paper some tables of (numerical) planar central configurations of n equal masses with Newtonian potential are given, for n=3,..., 10. They have been computed as the fixed points of a suitable self-map of R^{2(n-2)}.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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