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We show that a hypersurface of the regularized, spatial circular restricted three-body problem is of contact type whenever the energy level is below the first critical value (the energy level of the first Lagrange point) or if the energy…

Symplectic Geometry · Mathematics 2020-10-02 Wanki Cho , Hyojin Jung , Geonwoo Kim

We study the contact geometry of the connected components of the energy hypersurface, in the symmetric restricted 3-body problem on $\mathbb{S}^2$, for a specific type of motion of the primaries. In particular, we show that these components…

Dynamical Systems · Mathematics 2024-11-19 Kursat Yilmaz , Alessandro Arsie

The restricted planar three-body problem has a rich history, yet many unanswered questions still remain. In the present paper we prove the existence of a global surface of section near the smaller body in a new range of energies and mass…

Symplectic Geometry · Mathematics 2012-08-13 Peter Albers , Joel W. Fish , Urs Frauenfelder , Helmut Hofer , Otto van Koert

We characterize which closed Reeb orbits of a dynamically convex contact form on the 3-sphere bound disk-like global surfaces of section for the Reeb flow, without any genericity assumptions. We show that these global surfaces of section…

Symplectic Geometry · Mathematics 2015-02-09 Umberto Hryniewicz

We study Reeb dynamics on the three-sphere equipped with a tight contact form and an anti-contact involution. We prove the existence of a symmetric periodic orbit and provide necessary and sufficient conditions for it to bound an invariant…

Dynamical Systems · Mathematics 2021-06-30 Seongchan Kim

We show that the planar circular restricted three body problem is of restricted contact type for all energies below the first critical value (action of the first Lagrange point) and for energies slightly above it. This opens up the…

Symplectic Geometry · Mathematics 2012-08-13 Peter Albers , Urs Frauenfelder , Otto van Koert , Gabriel P. Paternain

In this note, we prove that below the first critical energy level, a proper combination of the Ligon-Schaaf and Levi-Civita regularization mappings provides a convex symplectic embedding of the energy surfaces of the planar rotating Kepler…

Symplectic Geometry · Mathematics 2016-05-24 Urs Frauenfelder , Otto van Koert , Lei Zhao

In this paper, we study the planar circular restricted three-body problem for energy levels slightly above the first critical value. We first observe that the energy hypersurfaces in the Birkhoff regularization corresponding to these energy…

Symplectic Geometry · Mathematics 2025-11-06 Jungsoo Kang , Kevin Ruck

We study the spatial isosceles three-body problem from the perspective of Symplectic Dynamics. For certain choices of mass ratio, angular momentum, and energy, the dynamics on the energy surface is equivalent to a Reeb flow on the tight…

Dynamical Systems · Mathematics 2023-08-07 Xijun Hu , Lei Liu , Yuwei Ou , Pedro A. S. Salomão , Guowei Yu

We study the spatial isosceles three body problem, which is a system with two degrees of freedom after modulo the rotation symmetry. For certain choices of energy and angular momentum, we find some disk-like global surfaces of section with…

Dynamical Systems · Mathematics 2023-08-08 Xijun Hu , Lei Liu , Yuwei Ou , Guowei Yu

This article concerns a natural generalization of the classical asymptotic Plateau problem in hyperbolic space. We prove the existence of a smooth complete hypersurface of constant scalar curvature with a prescribed asymptotic boundary at…

Differential Geometry · Mathematics 2025-08-26 Bin Wang

We study dynamical constraints arising from Embedded Contact Homology (ECH) in the spatial isosceles three-body problem. For energies below the critical level, the dynamics on the energy surface is identified with a Reeb flow on the tight…

Symplectic Geometry · Mathematics 2026-03-02 Xijun Hu , Lei Liu , Yuwei Ou , Zhiwen Qiao , Pedro A. S. Salomão

In this work, we prove that a generic unfolding of an analytic Hamiltonian Hopf singularity (in an open set with codimension 1 boundary) possesses transverse homoclinic orbits for subcritical values of the parameter close to the bifurcation…

Dynamical Systems · Mathematics 2025-11-10 Inmaculada Baldomá , Pau Martín , Donato Scarcella

In this paper we propose a computational approach to proving the Birkhoff conjecture on the restricted three-body problem, which asserts the existence of a disk-like global surface of section. Birkhoff had conjectured this surface of…

Symplectic Geometry · Mathematics 2025-02-18 Chankyu Joung , Otto van Koert

The spatial Kepler problem with a perturbation satisfying the rotational symmetry w.r.t. the $z$-axis and the reflection symmetry w.r.t. the $(x, y)$-plane, can be reduced to an Hamiltonian system with 2 degrees of freedom after fixing the…

Dynamical Systems · Mathematics 2026-01-28 Xijun Hu , Zhiwen Qiao , Guowei Yu

Using the wrapped Floer homology, we prove the existence of consecutive collisions at the primaries in the circular restricted three-body problem. We also prove the existence of a symmetric periodic orbit. These existence results are…

Symplectic Geometry · Mathematics 2025-12-29 Filip Broćić , Urs Frauenfelder

In this article, we extend the methods from arXiv:2011.06568, where the five dimensional analogue of the three dimensional finite energy foliations introduced by Hofer--Wysocki--Zehnder was identified, to the case where there the underlying…

Symplectic Geometry · Mathematics 2023-11-13 Agustin Moreno

We establish a general criterion for the existence of finite energy foliations on contact three-manifolds with boundary, imposing strong global constraints on the associated Reeb flows. Our main abstract result shows that a configuration of…

Dynamical Systems · Mathematics 2026-05-26 Lei Liu , Pedro A. S. Salomão

In this paper, we consider a time-periodically forced Kepler problem in any dimensions, with an external force which we only assume to be regular in a neighborhood of the attractive center. We prove that there exist infinitely many periodic…

Dynamical Systems · Mathematics 2020-10-30 Lei Zhao

Consider a symplectic surface in a three-dimensional contact manifold with boundary on Reeb orbits (periodic orbits of the Reeb vector field). We assume that the rotation numbers of the boundary Reeb orbits satisfy a certain inequality, and…

Symplectic Geometry · Mathematics 2025-05-23 Michael Hutchings
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