Period function and characterizations of Isochronous potentials

Details Period function and characterizations of Isochronous potentials Period function and characterizations of Isochronous potentials

2011-09-21

arxiv.org/abs/1109.4611v4

Mathematics

Dynamical Systems

30 pages

Scientific paper

We are interested at first in the study of the monotonicity for the period function of the conservative equation \ $(1)\quad \ddot x + g(x) = 0.$\quad Some refinements of known criteria are brought. Moreover, we give necessary and sufficient conditions so that the analytic potential of equation $(1)$ is isochronous. These conditions which are different from those introduced firstly by Koukles and Piskounov and thereafter by Urabe appear sometime to be easier to use. We then apply these results to produce families of isochronous potentials depending on many parameters, some of them are news. Moreover, analytic isochronicity requirements of parametrized potentials will also be considered

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