Concave toric domains in Stark-type mechanical systems

It was shown that the bounded components of the energy hypersurfaces of the planer Stark problem after the Levi-Civita transformation are concave toric domains. In this paper, we present a different approach to the problem of determining concave toric domains in a family of integrable natural mechanical problems in the plane based on the computation of action-angle variables. We give criteria on the potentials for the bounded components of the energy hypersurfaces to be concave toric domains and apply these criteria to a class of problems.