On the foundations of general relativistic celestial mechanics

Abstract

Towards the end of nineteenth century, Celestial Mechanics provided the most powerful tools to test Newtonian gravity in the solar system, and led also to the discovery of chaos in modern science. Nowadays, in light of general relativity, Celestial Mechanics leads to a new perspective on the motion of satellites and planets. The reader is here introduced to the modern formulation of the problem of motion, following what the leaders in the field have been teaching since the nineties. In particular, the use of a global chart for the overall dynamics of N bodies and N local charts describing the internal dynamics of each body. The next logical step studies in detail how to split the N-body problem into two sub-problems concerning the internal and external dynamics, how to achieve the effacement properties that would allow a decoupling of the two sub-problems, how to define external-potential-effacing coordinates and how to generalize the Newtonian multipole and tidal moments. The review paper ends with an assessment of the nonlocal equations of motion obtained within such a framework, a description of the modifications induced by general relativity of the theoretical analysis of the Newtonian three-body problem, and a mention of the potentialities of the analysis of solar-system metric data carried out with the Planetary Ephemeris Program.

arXiv comment26 pages, 1 figure

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• Gravitational wave forms, polarizations, response functions and energy losses of triple systems in Einstein-Aether theory
• Covariant Equations of Motion of Extended Bodies with Arbitrary Mass and Spin Multipoles
• An effective-gravity perspective on the Sun-Jupiter-comet three-body system
• Covariant Equations of Motion Beyond the Spin-Dipole Particle Approximation