scholarly journals Exponentially small asymptotic estimates for the splitting of separatrices to whiskered tori with quadratic and cubic frequencies

2014 ◽  
Vol 21 (0) ◽  
pp. 41-61 ◽  
Author(s):  
Pere Gutiérrez ◽  
Marina Gonchenko ◽  
Amadeu Delshams
Keyword(s):  
Asymptotic Estimates ◽  
Whiskered Tori ◽  
Splitting Of Separatrices ◽  
Exponentially Small

scholarly journals Exponentially Small Lower Bounds for the Splitting of Separatrices to Whiskered Tori with Frequencies of Constant Type

2014 ◽  
Vol 24 (08) ◽  
pp. 1440011 ◽  
Author(s):  
Amadeu Delshams ◽  
Marina Gonchenko ◽  
Pere Gutiérrez
Keyword(s):  
Lower Bounds ◽  
Invariant Manifolds ◽  
Irrational Number ◽  
Melnikov Method ◽  
Arithmetic Properties ◽  
Constant Type ◽  
Whiskered Tori ◽  
Vector Formula ◽  
Splitting Of Invariant Manifolds ◽  
Exponentially Small

We study the splitting of invariant manifolds of whiskered tori with two frequencies in nearly-integrable Hamiltonian systems, such that the hyperbolic part is given by a pendulum. We consider a two-dimensional torus with a fast frequency vector [Formula: see text], with ω = (1, Ω) where Ω is an irrational number of constant type, i.e. a number whose continued fraction has bounded entries. Applying the Poincaré–Melnikov method, we find exponentially small lower bounds for the maximal splitting distance between the stable and unstable invariant manifolds associated to the invariant torus, and we show that these bounds depend strongly on the arithmetic properties of the frequencies.

scholarly journals The splitting of separatrices for analytic diffeomorphisms

1990 ◽  
Vol 10 (2) ◽  
pp. 295-318 ◽  
Author(s):  
E. Fontich ◽  
C. Simó
Keyword(s):  
Invariant Manifolds ◽  
Complex Singularities ◽  
Homoclinic Points ◽  
Unperturbed Problem ◽  
Splitting Of Separatrices ◽  
Maximum Separation ◽  
Exponentially Small

AbstractWe study families of diffeomorphisms close to the identity, which tend to it when the parameter goes to zero, and having homoclinic points. We consider the analytical case and we find that the maximum separation between the invariant manifolds, in a given region, is exponentially small with respect to the parameter. The exponent is related to the complex singularities of a flow which is taken as an unperturbed problem. Finally several examples are given.

Sign in / Sign up

Export Citation Format

Share Document