Polygonal Homographic Orbits of the Curved n-Body Problem

Details Polygonal Homographic Orbits of the Curved n-Body Problem Polygonal Homographic Orbits of the Curved n-Body Problem

2010-12-11

arxiv.org/abs/1012.2490v2

Trans. Amer. Math. Soc. 364, 5 (2012), 2783-2802

Mathematics

Dynamical Systems

24 pages, 2 figures

Scientific paper

In the $2$-dimensional $n$-body problem, $n\ge 3$, in spaces of constant curvature, $\kappa\ne 0$, we study polygonal homographic solutions. We first provide necessary and sufficient conditions for the existence of these orbits and then consider the case of regular polygons. We further use this criterion to show that, for any $n\ge 3$, the regular $n$-gon is a polygonal homographic orbit if and only if all masses are equal. Then we prove the existence of relative equilibria of non-equal masses on the sphere of curvature $\kappa>0$ for $n=3$ in the case of scalene triangles. Such triangular relative equilibria occur only along fixed geodesics and are generated from fixed points of the sphere. Finally, through a classification of the isosceles case, we prove that not any three masses can form a triangular relative equilibrium.

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