Generic Twistless Bifurcations

Details Generic Twistless Bifurcations Generic Twistless Bifurcations

1999-01-22

arxiv.org/abs/chao-dyn/9901025v1

Nonlinearity, 13:203--224, 2000

Nonlinear Sciences

Chaotic Dynamics

29 pages, 9 figures

Scientific paper

10.1088/0951-7715/13/1/310

We show that in the neighborhood of the tripling bifurcation of a periodic orbit of a Hamiltonian flow or of a fixed point of an area preserving map, there is generically a bifurcation that creates a ``twistless'' torus. At this bifurcation, the twist, which is the derivative of the rotation number with respect to the action, vanishes. The twistless torus moves outward after it is created, and eventually collides with the saddle-center bifurcation that creates the period three orbits. The existence of the twistless bifurcation is responsible for the breakdown of the nondegeneracy condition required in the proof of the KAM theorem for flows or the Moser twist theorem for maps. When the twistless torus has a rational rotation number, there are typically reconnection bifurcations of periodic orbits with that rotation number.

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