Summary
General relativistic orbits in the Schwarzschild metric can be analysed in terms of the anharmonic asymmetric oscillator. A simple generalization of the usual Fourier series, suitable for this type of nonlinear system, is used with a harmonic-balance method to study approximate solutions of perturbed orbits. The existence of solutions of the limit cycle type is demonstrated quantitatively.
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Bejarano, J.D., Rodríguez, C.M. Planetary orbits as limit cycles. Nuov Cim B 107, 497–501 (1992). https://doi.org/10.1007/BF02723626
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DOI: https://doi.org/10.1007/BF02723626