On geodesic flows with symmetries and closed magnetic geodesics on orbifolds

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Let Q be a closed manifold admitting a locally-free action of a compact Lie group G. In this paper we study the properties of geodesic flows on Q given by Riemannian metrics which are invariant by such an action. In particular, we will be interested in the existence of geodesics which are closed up to the action of some element in the group G, since they project to closed magnetic geodesics on the quotient orbifold Q/G.