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DTSTART;TZID=Europe/Paris:20170630T130000
DTEND;TZID=Europe/Paris:20170630T140000
DTSTAMP:20260409T042527
CREATED:20170629T205452Z
LAST-MODIFIED:20170629T205452Z
UID:199-1498827600-1498831200@www.naxys.be
SUMMARY:Marco Sansottera (University of Milan)
DESCRIPTION:Title: Quasi-convexity of the Hamiltonian for non Harmonic or non Keplerian\ncentral potentials. \nAbstract: \nWe consider the planar central motion with a real analytic potential. We\nprove that the corresponding Hamiltonian\, when written in action angle\nvariables\, is almost everywhere quasiconvex\, the only exceptions being\nthe Keplerian and the Harmonic potentials. We deduce persistence of most\nKAM tori for the perturbed planar system. We also deduce a Nekhoroshev\ntype stability result for the perturbed spatial central motion. Such a\nlatter result covers also the case where the central system is put in\ninteraction with a slow system. \n 
URL:https://www.naxys.be/event/marco-sansottera-university-of-milan/
LOCATION:Seminar room\, Rempart de la Vierge 8\, Namur\, 1170
CATEGORIES:NAXYS Seminar
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