Codice QDD 107 Titolo Entire minimal parabolic trajectories: the planar anisotropic Kepler problem Data 2011-09-23 Autore/i Barutello, V.; Terracini, S.; Verzini, G. Link Download full text Abstract We continue the variational approach to parabolic tra jectories introduced in our previous paper [5], which sees parabolic orbits as minimal phase transitions. We deepen and complete the analysis in the planar case for homogeneous singular potentials. We characterize all parabolic orbits connecting two minimal central configurations as free-time Morse minimizers (in a given homotopy class of paths). These may occur for at most one value of the homogeneity exponent. In addition, we link this threshold of existence of parabolic tra jectories with the absence of collisions for all the minimizers of fixed-ends problems. Also the existence of action minimizing periodic trajectories with nontrivial homotopy type can be related with the same threshold.