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math.DG2016
A Hamiltonian version of a result of Gromoll and Grove
Urs Frauenfelder, Christian Lange, Stefan Suhr
The theorem that if all geodesics of a Riemannian two-sphere are closed they are also simple closed is generalized to real Hamiltonian structures on . For reversible…
math.DG2016
On metrics on 2-orbifolds all of whose geodesics are closed
Christian Lange
We show that the geodesic period spectrum of a Riemannian 2-orbifold all of whose geodesics are closed depends, up to a constant, only on its orbifold topology and compute it. In t…