TY - JOUR

T1 - Limit cycles of discontinuous piecewise quadratic and cubic polynomial perturbations of a linear center

AU - Llibre, Jaume

AU - Tang, Yilei

PY - 2019/4/1

Y1 - 2019/4/1

N2 - © 2019 American Institute of Mathematical Sciences. All Rights Reserved. We apply the averaging theory of high order for computing the limit cycles of discontinuous piecewise quadratic and cubic polynomial perturbations of a linear center. These discontinuous piecewise differential systems are formed by two either quadratic, or cubic polynomial differential systems separated by a straight line. We compute the maximum number of limit cycles of these discontinuous piecewise polynomial perturbations of the linear center, which can be obtained by using the averaging theory of order n for n = 1, 2, 3, 4, 5. Of course these limit cycles bifurcate from the periodic orbits of the linear center. As it was expected, using the averaging theory of the same order, the results show that the discontinuous quadratic and cubic polynomial perturbations of the linear center have more limit cycles than the ones found for continuous and discontinuous linear perturbations. Moreover we provide sufficient and necessary conditions for the existence of a center or a focus at infinity if the discontinuous piecewise perturbations of the linear center are general quadratic polynomials or cubic quasi–homogenous polynomials.

AB - © 2019 American Institute of Mathematical Sciences. All Rights Reserved. We apply the averaging theory of high order for computing the limit cycles of discontinuous piecewise quadratic and cubic polynomial perturbations of a linear center. These discontinuous piecewise differential systems are formed by two either quadratic, or cubic polynomial differential systems separated by a straight line. We compute the maximum number of limit cycles of these discontinuous piecewise polynomial perturbations of the linear center, which can be obtained by using the averaging theory of order n for n = 1, 2, 3, 4, 5. Of course these limit cycles bifurcate from the periodic orbits of the linear center. As it was expected, using the averaging theory of the same order, the results show that the discontinuous quadratic and cubic polynomial perturbations of the linear center have more limit cycles than the ones found for continuous and discontinuous linear perturbations. Moreover we provide sufficient and necessary conditions for the existence of a center or a focus at infinity if the discontinuous piecewise perturbations of the linear center are general quadratic polynomials or cubic quasi–homogenous polynomials.

KW - Averaging theory

KW - Discontinuous piecewise differential system

KW - Limit cycle

KW - Periodic solution

UR - https://ddd.uab.cat/data/record/204385

U2 - https://doi.org/10.3934/dcdsb.2018236

DO - https://doi.org/10.3934/dcdsb.2018236

M3 - Article

VL - 24

SP - 1769

EP - 1784

JO - Discrete and Continuous Dynamical Systems - Series B

JF - Discrete and Continuous Dynamical Systems - Series B

SN - 1531-3492

ER -