
We show that the Kepler problem is projectively equivalent to null geodesic motion on the conformal compactification of Minkowski-4 space. This space realises the conformal triality of Minkwoski, dS and AdS spaces.
4 pages, no figures. Some modifications
High Energy Physics - Theory, Geometric methods in ordinary differential equations, Applications of local differential geometry to the sciences, Projective connections, FOS: Physical sciences, General Relativity and Quantum Cosmology (gr-qc), Mathematical Physics (math-ph), Weyl geometry, General Relativity and Quantum Cosmology, integrable Hamiltonian systems, Differential geometric methods (tensors, connections, symplectic, Poisson, contact, Riemannian, nonholonomic, etc.) for problems in mechanics, High Energy Physics - Theory (hep-th), projective dynamics, null lifts, Non-Euclidean differential geometry, Mathematical Physics
High Energy Physics - Theory, Geometric methods in ordinary differential equations, Applications of local differential geometry to the sciences, Projective connections, FOS: Physical sciences, General Relativity and Quantum Cosmology (gr-qc), Mathematical Physics (math-ph), Weyl geometry, General Relativity and Quantum Cosmology, integrable Hamiltonian systems, Differential geometric methods (tensors, connections, symplectic, Poisson, contact, Riemannian, nonholonomic, etc.) for problems in mechanics, High Energy Physics - Theory (hep-th), projective dynamics, null lifts, Non-Euclidean differential geometry, Mathematical Physics
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