An exponential estimate of the time of stability of nearly-integrable hamiltonian systems
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...Arnold (1963c) and Nekhoroshev (1977) already worked in this direction, and, more recently, Guzzo and Morbidelli (1997) reformulated both theorems taking into account most features of small body dynamics....
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...A detailed description of how a Nekhoroshev result can be established goes beyond the scope of this section, and we report just a brief guideline. The interested reader can refer to Guzzo and Morbidelli (1997). In the Nekhoroshev domain, one first considers the subdomains where there are no mean motion resonances of Fourier order smaller than 1/ε....
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...An analogous study has been recently done by Nesvorný and Roig (2001) for the Kuiper belt....
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...2, the correct attitude for approaching the investigation of a given dynamical system is to search for an answer to the following questions: has the system the Nekhoroshev structure? In the negative case, at which order do resonances overlap? Unfortunately, it is not an easy task to answer these questions in an analytic way. This can be understood with the following qualitative argument, inspired by the work of Arnold (1963b). The width of a resonant domain scales as the square root of the coefficient of the corresponding resonant harmonic, i....
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