 1358 Amadeu Delshams, Marina Gonchenko, Pere Guti rrez
 Exponentially small asymptotic estimates for the splitting of separatrices to whiskered tori with quadratic and cubic frequencies
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Jun 27, 13

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Abstract. We study the splitting of invariant manifolds of whiskered tori with two or three frequencies in nearlyintegrable Hamiltonian systems. We consider 2dimensional tori with a frequency vector $\omega=(1,\Omega)$ where $\Omega$ is a quadratic irrational number, or 3dimensional tori with a frequency vector $\omega=(1,\Omega,\Omega^2)$ where $\Omega$ is a cubic irrational number. Applying the Poincar\'eMelnikov method, we find exponentially small asymptotic estimates for the maximal splitting distance between the stable and unstable manifolds associated to the invariant torus, showing that such estimates depend strongly on the arithmetic properties of the frequencies. In the quadratic case, we use the continued fractions theory to establish a certain arithmetic property, fulfilled in 24 cases, which allows us to provide asymptotic estimates in a simple way. In the cubic case, we focus our attention to the case in which $\Omega$ is the socalled cubic golden number (the real root of $x^3+x1=0$), obtaining also asymptotic estimates. We point out the similitudes and differences between the results obtained for both the quadratic and cubic cases.
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