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arXiv 1712.04085math.DS
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等质量平面三体问题极小元的几何性质

Geometric properties of minimizers in the planar three-body problem with two equal masses

Wentian Kuang, Duokui Yan

摘要:

它表明,8字形轨道的每个瓣是星形的,这意味着极角在每个瓣是单调的。一般来说,不清楚什么时候极小化是星形的。本文研究了两个等质量的平面三体问题中连接两个固定端的极小元(即Bolza问题)。我们证明了如果两个固定端的Jacobi坐标在相邻的闭象限内,则相应的极小元必须在两个相邻的闭象限内。如果我们进一步假设两个Jacobi坐标在其中一个固定端正交,则极小值中Jacobi坐标的极角至多有一个临界点。如果两个雅可比坐标在两端正交,则两个极角必须单调。这些几何性质可以用来证明存在两组周期轨道。

英文摘要:

It it shown that each lobe of the figure-eight orbit is star-shaped, which implies the polar angle is monotone in each lobe. In general, it is not clear when a minimizer is star-shaped. In this paper, we study minimizers connecting two fixed-ends (i.e. the Bolza problem) in the planar three-body problem with two equal masses. We show that if the Jacobi coordinates of the two fixed-ends are in adjacent closed quadrants, then the corresponding minimizer must stay in two adjacent closed quadrants. If we further assume the two Jacobi coordinates are orthogonal on one of the fixed-ends, then the polar angles of the Jacobi coordinates in the minimizer have at most one critical point. If the two Jacobi coordinates are orthogonal on both ends, then the two polar angles must be monotone. These geometric properties can be applied to show the existence of two sets of periodic orbits.

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