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math.DG2013★ 8 cited
The torsion flow on a closed pseudohermitian 3-manifold
Shu-Cheng Chang, Otto van Koert, Chin-Tung Wu
In this paper we define the torsion flow, a CR analogue of the Ricci flow. For homogeneous CR manifolds we give explicit solutions to the torsion flow illustrating various kinds of…
math.DG2011★ 8 cited
The Cartan geometry of the rotating Kepler problem
Kai Cieliebak, Urs Frauenfelder, Otto van Koert
We investigate the Cartan and Finsler geometry of the rotating Kepler problem, a limit case of the restricted three body problem that arises if the mass of the one of the primaries…