On the number of limit cycles for polycycles S⁽²⁾ and S⁽³⁾ in quadratic Hamilton systems under perturbations of piecewise smooth polynomials

2019/10/09 by Wang, Jiaxin, Zhao, Liqin
#Dynamical Systems (math.DS) #FOS: Mathematics

paper · doi:10.48550/arxiv.1910.03761

Abstract

In this paper, by using Picard-Fuchs equations and Chebyshev criterion, we study the bifurcate of limit cycles for quadratic Hamilton system S⁽²⁾ and S⁽³⁾: x= y+2axy+by², y=-x+x²-ay² with a∈(-(1)/(2),1), b=(1-a)(1+2a)^1/2 and a=1, b=0 respectively, under perturbations of piecewise smooth polynomials with degree n. The discontinuity is the line y=0. We bound the number of zeros of first order Melnikov function which controls the number of limit cycles bifurcating from the center. It is proved that the upper bounds of the number of limit cycles for S⁽²⁾ and S⁽³⁾ are respectively 25n+161 (n≥3) and 24n+126 (n≥3) (taking into account the multiplicity).

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