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We consider the Newtonian 3-body problem in dimension 4, and fix a value of the angular momentum which is compatible with this dimension. We show that the energy function cannot tend to its infimum on an unbounded sequence of states. Consequently the infimum of the energy is its minimum. This completes our previous work A. Albouy and H. R. Dullin, Relative equilibria of the 3-body problem in [Formula: see text, J. Geom. Mech. 12(3) (2020) 323–341] on the existence of Lyapunov stable relative periodic orbits in the 3-body problem in Formula: see text.
Albouy et al. (Fri,) studied this question.