Abstract
We prove for a large class of n-body problems including a subclass of quasihomogeneous n-body problems, the classical n-body problem, the n-body problem in spaces of negative constant Gaussian curvature and a restricted case of the n-body problem in spaces of positive constant curvature for the case that all masses are equal and not necessarily constant that any solution for which the point masses move on a circle of not necessarily constant size has to be either a regular cocircular homographic orbit in flat space, or a regular polygonal rotopulsator in curved space, under the constraint that the minimal distance between point masses attains its minimum in finite time. Additionally, we prove that the same holds true if we add an extra mass at the center of that circle and find an explicit formula for the mass of each point particle in terms of the radius of the circle. Finally, we prove that for each order of the masses there is at most one cocircular homographic orbit for the case that the masses need not be constant.
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Acknowledgements
The author would like to thank Dr. Alejandro Vidal-López and Dr. Thijs Kouwenhoven of Xi’an Jiaotong-Liverpool University for fruitful discussions that helped the author to double-check the results of this paper.
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Tibboel, P. Circular Non-collision Orbits for a Large Class of n-Body Problems. J Dyn Diff Equat 32, 205–217 (2020). https://doi.org/10.1007/s10884-018-9714-7
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DOI: https://doi.org/10.1007/s10884-018-9714-7