The concept of grand angular momentum is widely used in the study of N-body problems quantum mechanically. Here, we applied it to a classical analysis of N-body problems. Utilizing the tree representation for Jacobi and hyperspherical coordinates, we found a decomposition of its magnitude into magnitudes of one-body angular momenta in 3 dimensions. We generalized some results from the two-body problem. Furthermore, we derive the general expression for the scattering angle for the N-body problem.
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Liang et al. (2024) studied this question.
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