On the conservation of the Jacobi integral in the post-Newtonian circular restricted three-body problem

Abstract

In the present paper, using the first-order approximation of the $n$-body Lagrangian (derived on the basis of the post-Newtonian gravitational theory of Einstein, Infeld, and Hoffman), we explicitly write down the equations of motion for the planar circular restricted three-body problem. Additionally, with some simplified assumptions, we obtain two formulas for estimating the values of the mass/distance and velocity/speed of light ratios appropriate for a given post-Newtonian approximation. We show that the formulas derived in the present study, lead to a good numerical conservation of the Jacobi constant and allow for an approximate equivalence between the Lagrangian and Hamiltonian approaches at the same post-Newtonian order. Accordingly, the dynamics of the system is analyzed in terms of the Poincaré sections method and Lyapunov exponents, finding that for specific values of the Jacobi constant the dynamics can be either chaotic or regular. Our results suggest that the chaoticity of the post-Newtonian system is slightly in- creased in comparison with its Newtonian counterpart.

13 pages, 6 figures. This version has been substantially revised. Some new results were added

References in corpus (4)

• The three-body problem
• Second post-Newtonian Lagrangian dynamics of spinning compact binaries
• A note on the equivalence of Lagrangian and Hamiltonian formulations at post-Newtonian approximations
• Relativistic invariance of Lyapunov exponents in bounded and unbounded systems

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