The dynamics through the first two Lagrange necks in the small-mass restricted three-body problem

Lei Liu; Pedro A. S. Salomão

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arXiv · 2611.09034

The dynamics through the first two Lagrange necks in the small-mass restricted three-body problem

Lei Liu·Pedro A. S. Salomão

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Abstract

We study the planar circular restricted three-body problem (PCR3BP) for sufficiently small mass ratios, from low energies to slightly above the second Lagrange value. We show that retrograde orbits around the primaries and Lyapunov orbits at the necks form the binding of a finite energy foliation. We construct these foliations using the theory of pseudoholomorphic curves in symplectizations developed by Hofer, Wysocki and Zehnder. Slightly above the second Lagrange value, the dynamics is transverse to families of disks bounded by the retrograde orbits, and cylinders connecting the retrograde orbits to the Lyapunov orbits, forming a $3-2-3-2$ foliation. The proof uses the rotating Kepler problem and Hill's lunar problem to control the singular limit as the mass ratio $μ\to 0$. As a consequence of the foliation, both Lyapunov orbits have infinitely many homoclinic orbits.

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Lei Liu, Pedro A. S. Salomão. 2026-11-06. The dynamics through the first two Lagrange necks in the small-mass restricted three-body problem. https://arxiv.org/abs/2611.09034

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