Article Contents
Article Contents

# Renormalization for cubic frequency invariant tori in Hamiltonian systems with two degrees of freedom

• We consider the break-up of invariant tori in Hamiltonian systems with two degrees of freedom with a frequency which belongs to a cubic field. We define and construct renormalization-group transformations in order to determine the threshold of the break-up of these tori. A first transformation is defined from the continued fraction expansion of the frequency, and a second one is defined with a fixed frequency vector in a space of Hamiltonians with three degrees of freedom.
Mathematics Subject Classification: 37E20.

 Citation: