Vanishing Twist in the Saddle-Centre and Period-Doubling BifurcationReport as inadecuate



 Vanishing Twist in the Saddle-Centre and Period-Doubling Bifurcation


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The lowest order resonant bifurcations of a periodic orbit of a Hamiltonian system with two degrees of freedom have frequency ratio 1:1 saddle-centre and 1:2 period-doubling. The twist, which is the derivative of the rotation number with respect to the action, is studied near these bifurcations. When the twist vanishes the nondegeneracy condition of the isoenergetic KAM theorem is not satisfied, with interesting consequences for the dynamics. We show that near the saddle-centre bifurcation the twist always vanishes. At this bifurcation a ``twistless torus is created, when the resonance is passed. The twistless torus replaces the colliding periodic orbits in phase space. We explicitly derive the position of the twistless torus depending on the resonance parameter, and show that the shape of this curve is universal. For the period doubling bifurcation the situation is different. Here we show that the twist does not vanish in a neighborhood of the bifurcation.



Author: Holger R. Dullin; Alexey V. Ivanov

Source: https://archive.org/







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