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Critical periods in planar polynomial centers near a maximum number of cusps
De Maesschalck, Peter (Hasselt University)
Torregrosa, Joan (Universitat Autònoma de Barcelona. Departament de Matemàtiques)

Date: 2024
Abstract: We provide the best lower bound for the number of critical periods of planar polynomial centers known up to now. The new lower bound is obtained in the Hamiltonian class and considering a single period annulus. This lower bound doubles the previous one from the literature, and we end up with at least n2 - 2 (resp. n2 - 2n - 1) critical periods for planar polynomial systems of odd (resp. even) degree n. Key idea is the perturbation of a vector field with many cusp equilibria, whose construction is by itself a nontrivial construction that uses elements of catastrophe theory.
Grants: Agencia Estatal de Investigación PID2019-104658GB-I00
Ministerio de Ciencia e Innovación CEX2020-001084-M
Agència de Gestió d'Ajuts Universitaris i de Recerca 2021/SGR-00113
Rights: Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, i la comunicació pública de l'obra, sempre que no sigui amb finalitats comercials, i sempre que es reconegui l'autoria de l'obra original. No es permet la creació d'obres derivades. Creative Commons
Language: Anglès
Document: Article ; recerca ; Versió acceptada per publicar
Subject: Critical periods ; Hamiltonian vector fields ; Best lower bound ; Degree n vector field
Published in: Journal of differential equations, Vol. 380 (January 2024) , p. 181-197, ISSN 1090-2732

DOI: 10.1016/j.jde.2023.10.034


Available from: 2026-01-31
Postprint

The record appears in these collections:
Research literature > UAB research groups literature > Research Centres and Groups (research output) > Experimental sciences > GSD (Dynamical systems)
Articles > Research articles
Articles > Published articles

 Record created 2024-02-27, last modified 2024-05-06



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