49 citations · 143 across the 23 of their papers we have counts for
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math.DS2019★ 5 cited
-invariants for planar two-center Stark-Zeeman systems
Kai Cieliebak, Urs Frauenfelder, Lei Zhao
In this paper, we introduce the notion of planar two-center Stark- Zeeman systems and define four J+-like invariants for their periodic orbits. The construction is based on a previ…
math-ph2019★ 1 cited
Lambert's theorem and projective dynamics
Alain Albouy, Lei Zhao
We prove that the classical Lambert theorem about the elapsed time on an arc of Keplerian orbit extends without change to the Kepler problem on a space of constant curvature. We pr…