Abstract
Following Part I, we consider a class of reversible systems and study bifurcations of homoclinic orbits to hyperbolic saddle equilibria. Here we concentrate on the case in which homoclinic orbits are symmetric, so that only one control parameter is enough to treat their bifurcations, as in Hamiltonian systems. First, we modify and extend arguments of Part I to show in a form applicable to general systems discussed there that if such bifurcations occur in four-dimensional systems, then variational equations around the homoclinic orbits are integrable in the meaning of differential Galois theory under some conditions. We next extend the Melnikov method of Part I to reversible systems and obtain some theorems on saddle-node, transcritical and pitchfork bifurcations of symmetric homoclinic orbits. We illustrate our theory for a four-dimensional system, and demonstrate the theoretical results by numerical ones.
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This work was partially supported by the JSPS KAKENHI Grant Numbers 25400168 and 17H02859.
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Yagasaki, K. Analytic and Algebraic Conditions for Bifurcations of Homoclinic Orbits II: Reversible Systems. J Dyn Diff Equat 35, 1863–1884 (2023). https://doi.org/10.1007/s10884-021-10091-5
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DOI: https://doi.org/10.1007/s10884-021-10091-5