01-474 Heinz Hanßmann, Jan-Cees van der Meer
On the Hamiltonian Hopf bifurcations in the 3D Hénon-Heiles family (190K, PostScript, gzipped and uuencoded) Dec 17, 01
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Abstract. An axially symmetric perturbed isotropic harmonic oscillator undergoes several bifurcations as the parameter $\lambda$ adjusting the relative strength of the two terms in the cubic potential is varied. We show that three of these bifurcations are Hamiltonian Hopf bifurcations. To this end we analyse an appropriately chosen normal form. It turns out that the linear behaviour is not that of a typical Hamiltonian Hopf bifurcation as the eigenvalues completely vanish at the bifurcation. However, the nonlinear structure is that of a Hamiltonian Hopf bifurcation. The result is obtained by formulating geometric criteria involving the normalized Hamiltonian and the reduced phase space.

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