Limit cycles of generic piecewise center-type vector fields in R3 separated by either one plane or by two parallel planes
Villanueva, Yovani (Universidade Federal de Goiás. Instituto de Matemática e Estatística)
Llibre, Jaume (Universitat Autònoma de Barcelona. Departament de Matemàtiques)
Euzébio, R (Universidade Federal de Goiás. Instituto de Matemática e Estatística)

Data:	2022
Resum:	While the limit cycles of the piecewise differential systems in the plane R2 have been studied intensively during these last twenty years, this is not the case for the limit cycles of the piecewise differential systems in the space R3. The goal of this article is to study the continuous and discontinuous piecewise differential systems in R3, formed by linear vector fields similar to planar centers separated by one or two parallel planes. We call those "center-type" differential systems, which have two pure imaginary numbers and zero as eigenvalues. When these kinds of piecewise differential systems are continuous or discontinuous separated by one plane, then they have no limit cycles. Also, if they are continuous separated by two planes, then generically they do not have limit cycles. But when the piecewise differential systems are discontinuous separated two parallel planes, we show that generically they can have at most four limit cycles, and that there exist such systems with four limit cycles. The genericity here means that the statements hold in a residual set of the space of parameters associated to the differential system. We recall that the same problem but for discontinuous piecewise differential systems in R2 formed by linear differential centers separated by two parallel straight lines have at most one limit cycle.
Ajuts:	Agencia Estatal de Investigación PID2019-104658GB-I00 European Commission 777911
Drets:	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.
Llengua:	Anglès
Document:	Article ; recerca ; Versió acceptada per publicar
Matèria:	Filippov vector fields ; Limit cycles ; Continuous piecewise vector fields ; Discontinous piecewise vector fields
Publicat a:	Bulletin des Sciences Mathematiques, Vol. 179 (October 2022) , art. 103173, ISSN 0007-4497

DOI: 10.1016/j.bulsci.2022.103173

Postprint 21 p, 495.7 KB

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