Arnold Diffusion in the Full Three-Body Problem

We show the existence of Arnold diffusion in the planar full three-body problem, which is expressed as a perturbation of a Kepler problem and a planar circular restricted three-body problem, with the perturbation parameter being the mass of the smallest body. In this context, we obtain Arnold diffusion in terms of a transfer of energy, in an amount independent of the perturbation parameter, between the Kepler problem and the restricted three-body problem. Our argument is based on a topological method based on correctly aligned windows which is implemented into a computer assisted proof. This approach can be applied to physically relevant masses of the bodies, such as those in a Neptune-Triton-asteroid system. In this case, we obtain explicit estimates for the range of the perturbation parameter and for the diffusion time.