# American Institute of Mathematical Sciences

July  1996, 2(3): 307-314. doi: 10.3934/dcds.1996.2.307

## Some remarks on a variational approach to Arnold's diffusion

 1 Scuola Normale Superiore, P.zadeiCavalieri7, 56126, Pisa, Italy

Received  May 1996 Published  May 1996

In this paper we consider the following class of Lagrangian systems:

$\qquad\qquad \qquad\qquad L_{\epsilon,\mu}(q,\dot{q},Q,\dot{Q},t) = \frac{\dot{Q}^2}2+\frac{\dot{q}^2}2 + \epsilon(1-\cos q)+ \mu f(q,\dot{q},Q,\dot{Q},t,\mu)$

which has been studied by many authors in connection with Arnold's diffusion. Extending [2] prove, by variational means, that, for suitable perturbations including for example:

$\qquad\qquad \qquad\qquad f(q,\dot{q},Q,\dot{Q}, t,\mu)=(1-\cos q)(\cos Q+\cos t) + \mu^{p-1} \sin(q+Q) \quad (p>2)$

if $\mu$ is small enough, exists a diffusion orbit of $L_{\epsilon, \mu}$ such that $\dot{Q}(t)$ undergoes a variation of order $1$ in a time $t_d$ polinomial in $\mu$, $t_d\approx \frac 1{\mu^2}$.

Citation: Massimiliano Berti. Some remarks on a variational approach to Arnold's diffusion. Discrete & Continuous Dynamical Systems - A, 1996, 2 (3) : 307-314. doi: 10.3934/dcds.1996.2.307
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