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arXiv math-ph/0509056math-phmath.DSmath.MP
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分数Lindstedt级数

Fractional Lindstedt series

Giovanni Gallavotti, Guido Gentile, Alessandro Giuliani

摘要:

高度共振准周期运动的表面(低维环面)的参数方程一般不能在扰动参数中解析地连续,即它们不是扰动参数的解析函数。然而,一般而言,准周期运动的频率只满足一个合理的关系(“共振1”)承认正式的扰动扩展方面的分数功率的扰动参数,这取决于退化的共振。我们发现这种情况发生的条件,并在这种情况下,我们证明了正式的扩展后收敛适当的remation。

英文摘要:

The parametric equations of the surfaces on which highly resonant quasi-periodic motions develop (lower-dimensional tori) cannot be analytically continued, in general, in the perturbation parameter, i.e. they are not analytic functions of the perturbation parameter. However rather generally quasi-periodic motions whose frequencies satisfy only one rational relation ("resonances of order 1") admit formal perturbation expansions in terms of a fractional power of the perturbation parameter, depending on the degeneration of the resonance. We find conditions for this to happen, and in such a case we prove that the formal expansion is convergent after suitable resummation.

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