Global behaviour of the period function of the sum of two quasi-homogeneous vector fields

M. J. Álvarez, A. Gasull, R. Prohens

Research output: Contribution to journalArticleResearchpeer-review

3 Citations (Scopus)

Abstract

© 2017 Elsevier Inc. We study the global behaviour of the period function on the period annulus of degenerate centres for two families of planar polynomial vector fields. These families are the quasi-homogeneous vector fields and the vector fields given by the sum of two quasi-homogeneous Hamiltonian ones. In the first case we prove that the period function is globally decreasing, extending previous results that deal either with the Hamiltonian quasi-homogeneous case or with the general homogeneous situation. In the second family, and after adding some more additional hypotheses, we show that the period function of the origin is either decreasing or has at most one critical period and that both possibilities may happen. This result also extends some previous results that deal with the situation where both vector fields are homogeneous and the origin is a non-degenerate centre.
Original languageEnglish
Pages (from-to)1553-1569
JournalJournal of Mathematical Analysis and Applications
Volume449
Issue number2
DOIs
Publication statusPublished - 15 May 2017

Keywords

  • Centre
  • Critical period
  • Degenerate critical point
  • Hamiltonian system
  • Period function

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