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Exponentially Long Stability Times for a Nonlinear Lattice in the Thermodynamic Limit

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Abstract

In this paper, we construct an adiabatic invariant for a large 1–d lattice of particles, which is the so called Klein Gordon lattice. The time evolution of such a quantity is bounded by a stretched exponential as the perturbation parameters tend to zero. At variance with the results available in the literature, our result holds uniformly in the thermodynamic limit. The proof consists of two steps: first, one uses techniques of Hamiltonian perturbation theory to construct a formal adiabatic invariant; second, one uses probabilistic methods to show that, with large probability, the adiabatic invariant is approximately constant. As a corollary, we can give a bound from below to the relaxation time for the considered system, through estimates on the autocorrelation of the adiabatic invariant.

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  1. Università di Milano, Dipartimento di Matematica, Via Saldini 50, 20133, Milano, Italy

    Andrea Carati & Alberto Mario Maiocchi

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  1. Andrea Carati
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  2. Alberto Mario Maiocchi
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Correspondence to Andrea Carati.

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Communicated by G. Gallavotti

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Carati, A., Maiocchi, A.M. Exponentially Long Stability Times for a Nonlinear Lattice in the Thermodynamic Limit. Commun. Math. Phys. 314, 129–161 (2012). https://doi.org/10.1007/s00220-012-1522-z

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  • DOI: https://doi.org/10.1007/s00220-012-1522-z

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