  The $J^k$ space of $k$-jets of a real function of one real variable $x$
admits the structure of a sub-Riemannian manifold, which then has an associated
Hamiltonian geodesic flow, and it is integrable. As in any Hamiltonian flow, a
natural question is the existence of periodic solutions. Does $J^k$ have
periodic geodesics? This study will find the action-angle coordinates in
$T^*J^k$ for the geodesic flow and demonstrate that geodesics in $J^k$ are
never periodic.
