Title: Periodic controls in step 2 strictly convex sub-Finsler problems
Authors: Yu. L. Sachkov
Journal title: Regular and Chaotic Dynamics
Year: 2020
Issue: 25
Volume: 1
Pages: 33--39
Abstract:

We consider control-linear left-invariant time-optimal problems on step 2 Carnot groups  with strictly convex set of control parameters (in particular, sub-Finsler problems). 

We describe all linear-in-momenta Casimirs on the dual of the Lie algebra.

In the case of rank 3 Lie groups we describe the symplectic foliation on the dual of the Lie algebra. On this basis we show that extremal controls are either constant or periodic. 

Some related results for other Carnot groups are presented.