Rempe-Gillen, L ORCID: 0000-0001-8032-8580 and Sixsmith, D ORCID: 0000-0002-3543-6969
(2017)
Hyperbolic entire functions and the Eremenko-Lyubich class: Class B or not class B?
Mathematische Zeitschrift, 286 (3-4).
pp. 783-800.
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Abstract
Hyperbolicity plays an important role in the study of dynamical systems, and is a key concept in the iteration of rational functions of one complex variable. Hyperbolic systems have also been considered in the study of transcendental entire functions. There does not appear to be an agreed definition of the concept in this context, due to complications arising from the non-compactness of the phase space. In this article, we consider a natural definition of hyperbolicity that requires expanding properties on the preimage of a punctured neighbourhood of the isolated singularity. We show that this definition is equivalent to another commonly used one: a {\tef} is hyperbolic if and only if its postsingular set is a compact subset of the Fatou set. This leads us to propose that this notion should be used as the general definition of hyperbolicity in the context of entire functions, and, in particular, that speaking about hyperbolicity makes sense only within the \emph{Eremenko-Lyubich class} $\mathcal{B}$ of transcendental entire functions with a bounded set of singular values. We also considerably strengthen a recent characterisation of the class $\mathcal{B}$, by showing that functions outside of this class cannot be expanding with respect to a metric whose density decays at most polynomially. In particular, this implies that no transcendental entire function can be expanding with respect to the spherical metric. Finally we give a characterisation of an analogous class of functions analytic in a hyperbolic domain.
Item Type: | Article |
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Additional Information: | 20 pages, 2 figures. V2: Final accepted manuscript, to appear in Math. Zeitschrift. Various minor corrections from V1 |
Uncontrolled Keywords: | Primary 37F10, Secondary 30D05, 30D15, 30D20, 37F15 |
Depositing User: | Symplectic Admin |
Date Deposited: | 04 Jan 2017 16:26 |
Last Modified: | 19 Jan 2023 07:23 |
DOI: | 10.1007/s00209-016-1784-9 |
Open Access URL: | http://dx.doi.org/10.1007/s00209-016-1784-9 |
Related URLs: | |
URI: | https://livrepository.liverpool.ac.uk/id/eprint/3005033 |
Available Versions of this Item
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Hyperbolic entire functions and the Eremenko-Lyubich class: Class B or not class B? (deposited 12 Oct 2016 07:35)
- Hyperbolic entire functions and the Eremenko-Lyubich class: Class B or not class B? (deposited 04 Jan 2017 16:26) [Currently Displayed]