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Conformal Geometry and Dynamics

Published by the American Mathematical Society since 1997, the purpose of this electronic-only journal is to provide a forum for mathematical work in related fields broadly described as conformal geometry and dynamics. All articles are freely available to all readers and with no publishing fees for authors.

ISSN 1088-4173

The 2020 MCQ for Conformal Geometry and Dynamics is 0.49.

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Mating Kleinian groups isomorphic to $C_2\ast C_5$ with quadratic polynomials
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by Marianne Freiberger
Conform. Geom. Dyn. 7 (2003), 11-33
Published electronically: May 27, 2003


Given a quadratic polynomial $q:\hat {\mathbb {C}}\rightarrow \hat {\mathbb {C}}$ and a representation $G:\hat {\mathbb {C}} \rightarrow \hat {\mathbb {C}}$ of $C_2\ast C_5$ in $PSL(2,\mathbb {C})$ satisfying certain conditions, we will construct a $4:4$ holomorphic correspondence on the sphere (given by a polynomial relation $p(z,w)$) that mates the two actions: The sphere will be partitioned into two completely invariant sets $\Omega$ and $\Lambda$. The set $\Lambda$ consists of the disjoint union of two sets, $\Lambda _+$ and $\Lambda _-$, each of which is conformally homeomorphic to the filled Julia set of a degree 4 polynomial $P$. This filled Julia set contains infinitely many copies of the filled Julia set of $q$. Suitable restrictions of the correspondence are conformally conjugate to $P$ on each of $\Lambda _+$ and $\Lambda _-$. The set $\Lambda$ will not be connected, but it can be joined up using a family $\mathcal {C}$ of completely invariant curves. The action of the correspondence on the complement of $\Lambda \cup \mathcal {C}$ will then be conformally conjugate to the action of $G$ on a simply connected subset of its regular set.
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Bibliographic Information
  • Marianne Freiberger
  • Affiliation: School of Mathematical Sciences, Queen Mary, University of London, London E1 4NS, UK
  • Email:
  • Received by editor(s): November 23, 2001
  • Received by editor(s) in revised form: March 13, 2003
  • Published electronically: May 27, 2003
  • Additional Notes: The author was supported in part by the European Commission and EPSRC. The author would like to thank Shaun Bullett for many enlightening conversations. Also, thanks to the referee for useful comments
  • © Copyright 2003 American Mathematical Society
  • Journal: Conform. Geom. Dyn. 7 (2003), 11-33
  • MSC (2000): Primary 37F45, 37F30, 37F05; Secondary 37F10
  • DOI:
  • MathSciNet review: 1992035