A global Nekhoroshev theorem for particles on the torus with time dependent Hamiltonian

We prove a $C^\infty$ global version of Nekhoroshev theorem for time dependent Hamiltonians in $R^d\times T^d$. Precisely, we prove a result showing that for all times the actions of the unperturbed systems are bounded by a constant times $\langle t\rangle^ε$. We apply the result to the dynamics of a charged particle in $T^d$ subject to a time dependent electromagnetic field.

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