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4 papers
Sharp systolic inequalities for rotationally symmetric 2-orbifolds
Christian Lange, Tobias Soethe
We show that suitably defined systolic ratios are globally bounded from above on the space of rotationally symmetric spindle orbifolds and that the upper bound is attained precisel…
On the rigidity of Zoll magnetic systems on surfaces
Luca Asselle, Christian Lange
In this paper we study rigidity aspects of Zoll magnetic systems on closed surfaces. We characterize magnetic systems on surfaces of positive genus given by constant curvature metr…
Odd-dimensional orbifolds with all geodesics closed are covered by manifolds
Manual Amann, Christian Lange, Marco Radeschi
Manifolds all of whose geodesics are closed have been studied a lot, but there are only few examples known. The situation is different if one allows in addition for orbifold singul…
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…