Periodic Magnetic Geodesics on Heisenberg Manifolds

We study the dynamics of magnetic flows on Heisenberg groups. Let $H$ denote the three-dimensional simply connected Heisenberg Lie group endowed with a left-invariant Riemannian metric and an exact, left-invariant magnetic field. Let $\mathrm{\Gamma }$ be a lattice subgroup of $H,$ so that $\mathrm{\Gamma }\mathrm{\backslash }H$ is a closed nilmanifold. We first find an explicit description of magnetic geodesics on $H$, then determine all closed magnetic geodesics and their lengths for $\mathrm{\Gamma }\mathrm{\backslash }H$. We then consider two applications of these results: the density of periodic magnetic geodesics and marked magnetic length spectrum rigidity.