Spinning deformations of rational maps

Details Spinning deformations of rational maps Spinning deformations of rational maps

2002-06-06

arxiv.org/abs/math/0206054v1

Mathematics

Dynamical Systems

39 pages, 8 figures

Scientific paper

We analyze a real one-parameter family of quasiconformal deformations of a hyperbolic rational map known as {\em spinning}. We show that under fairly general hypotheses, the limit of spinning either exists and is unique, or else converges to infinity in the moduli space of rational maps of a fixed degree. When the limit exists, it has either a parabolic fixed point, or a pre-periodic critical point in the Julia set, depending on the combinatorics of the data defining the deformation. The proofs are soft and rely on two ingredients: the construction of a Riemann surface containing the closure of the family, and an analysis of the geometric limits of some simple dynamical systems. An interpretation in terms of Teichm\"uller theory is presented as well.

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