Polynomial entropies for Bott nondegenerate Hamiltonian systems
  In this paper, we study the entropy of a Hamiltonian flow in restriction to an enregy level where it admits a first integral which is nondegenerate in the Bott sense. It is easy to see that for such a flow, the topological entropy vanishes. We focus on the polynomial and the weak polynomial entropies. We prove that, under conditions on the critical level of the Bott first integral and dynamical conditions on the hamiltonian function, the weak polynomial entropy belongs to {0,1} and the polynomial entropy belongs to {0,1,2}. 
Cl\'emence Labrousse and Jean-Pierre Marco
math.DS