A Hamiltonian version of a result of Gromoll and Grove
classification
🧮 math.DG
math.SG
keywords
closedgeodesicshamiltoniancoincidefinslergeneralizedgromollgrove
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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 $\mathbb{R}P^3$. For reversible Finsler $2$-spheres all of whose geodesics are closed this implies that the lengths of all geodesics coincide.
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