Limit cycles in piecewise smooth systems with circular switching manifold
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arXiv
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| Hauptverfasser: | , , |
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| Format: | Preprint |
| Veröffentlicht: |
2026
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| _version_ | 1866911630443413504 |
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| author | Rondón, Gabriel da Silva, Paulo R. Llibre, Jaume |
| author_facet | Rondón, Gabriel da Silva, Paulo R. Llibre, Jaume |
| contents | We study limit cycles in piecewise complex systems with switching manifold $\mathbb{S}^1$. Using Möbius transformations we establish an equivalence between circular and straight-line discontinuities that preserves periods, stability, and algebraic structure. For piecewise polynomial holomorphic systems we obtain lower bounds on the number of limit cycles via second-order averaging and, for low degrees, via Lyapunov quantities. For piecewise antiholomorphic systems we prove upper bounds: at most $3$ limit cycles in the linear case and $10$ in the quadratic case. We also prove a rigidity theorem: when both components admit classical holomorphic normal forms at the origin no crossing limit cycles exist. Finally, we construct explicit algebraic limit cycles in the circular context, providing, as far as we know the first such examples in the literature. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2604_26061 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Limit cycles in piecewise smooth systems with circular switching manifold Rondón, Gabriel da Silva, Paulo R. Llibre, Jaume Dynamical Systems Classical Analysis and ODEs Complex Variables 30C20, 34A36, 34C07, 37G15 We study limit cycles in piecewise complex systems with switching manifold $\mathbb{S}^1$. Using Möbius transformations we establish an equivalence between circular and straight-line discontinuities that preserves periods, stability, and algebraic structure. For piecewise polynomial holomorphic systems we obtain lower bounds on the number of limit cycles via second-order averaging and, for low degrees, via Lyapunov quantities. For piecewise antiholomorphic systems we prove upper bounds: at most $3$ limit cycles in the linear case and $10$ in the quadratic case. We also prove a rigidity theorem: when both components admit classical holomorphic normal forms at the origin no crossing limit cycles exist. Finally, we construct explicit algebraic limit cycles in the circular context, providing, as far as we know the first such examples in the literature. |
| title | Limit cycles in piecewise smooth systems with circular switching manifold |
| topic | Dynamical Systems Classical Analysis and ODEs Complex Variables 30C20, 34A36, 34C07, 37G15 |
| url | https://arxiv.org/abs/2604.26061 |