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arXiv 0906.2249math-phmath.MP
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给定曲线上的三体编排

Three-Body Choreographies in Given Curves

Hiroshi Ozaki, Hiroshi Fukuda, Toshiaki Fujiwara

摘要:

正如约翰内斯·开普勒在1609年所指出的,在二体问题中,轨道的形状、给定的椭圆和给定的不为零的恒定角动量完全决定了行星的运动。即使在三体问题中,在某些情况下,轨道的形状、质心的守恒和一个运动常数(角动量或总能量)决定了三个物体的运动。我们表明,通过几何方法,舞蹈动作,其中等质量的三个机构追逐对方围绕同一曲线,将唯一确定以下两种情况。(i)给出了具有点对称性和角动量不为零的凸曲线。(ii)给出了与8字形解和能量常数曲线相似的8字形曲线。运动是否满足运动方程是运动真实性的检验标准。一般曲线的方法的扩展。推广的方法适用于不具有点对称性的一般曲线。每个物体都有自己的曲线和不为零的质量。

英文摘要:

As shown by Johannes Kepler in 1609, in the two-body problem, the shape of the orbit, a given ellipse, and a given non-vanishing constant angular momentum determines the motion of the planet completely. Even in the three-body problem, in some cases, the shape of the orbit, conservation of the centre of mass and a constant of motion (the angular momentum or the total energy) determines the motion of the three bodies. We show, by a geometrical method, that choreographic motions, in which equal mass three bodies chase each other around a same curve, will be uniquely determined for the following two cases. (i) Convex curves that have point symmetry and non-vanishing angular momentum are given. (ii) Eight-shaped curves which are similar to the curve for the figure-eight solution and the energy constant are given. The reality of the motion should be tested whether the motion satisfies an equation of motion or not. Extensions of the method for generic curves are shown. The extended methods are applicable to generic curves which does not have point symmetry. Each body may have its own curve and its own non-vanishing masses.

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