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ON THE UNIFORM PERFECTNESS OF THE BOUNDARY OF MULTIPLY CONNECTED WANDERING DOMAINS

  • WALTER BERGWEILER (a1) and JIAN-HUA ZHENG (a2)
Abstract

We investigate when the boundary of a multiply connected wandering domain of an entire function is uniformly perfect. We give a general criterion implying that it is not uniformly perfect. This criterion applies in particular to examples of multiply connected wandering domains given by Baker. We also provide examples of infinitely connected wandering domains whose boundary is uniformly perfect.

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Copyright
Corresponding author
For correspondence; e-mail: bergweiler@math.uni-kiel.de
Footnotes
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The first-named author was supported by a Chinese Academy of Sciences Visiting Professorship for Senior International Scientists, Grant No. 2010 TIJ10, the Deutsche Forschungsgemeinschaft, Be 1508/7-1, the EU Research Training Network CODY and the ESF Networking Programme HCAA. The second-named author was supported by Grant No. 10871108 of the NSF of China.

Footnotes
References
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[1]Baker, I. N., ‘Multiply connected domains of normality in iteration theory’, Math. Z. 81 (1963), 206214.
[2]Baker, I. N., ‘The domains of normality of an entire function’, Ann. Acad. Sci. Fenn. Ser. A I Math. 1 (1975), 277283.
[3]Baker, I. N., ‘An entire function which has wandering domains’, J. Aust. Math. Soc. (Ser. A) 22 (1976), 173176.
[4]Baker, I. N., ‘Wandering domains in the iteration of entire functions’, Proc. Lond. Math. Soc. (3) 49 (1984), 563576.
[5]Baker, I. N., ‘Infinite limits in the iteration of entire functions’, Ergodic Theory Dynam. Systems 8 (1988), 503507.
[6]Beardon, A. F. and Pommerenke, Ch., ‘The Poincaré metric of plane domains’, J. Lond. Math. Soc. 18 (1978), 475483.
[7]Bergweiler, W., ‘Iteration of meromorphic functions’, Bull. Amer. Math. Soc. (N.S.) 29 (1993), 151188.
[8]Bergweiler, W., ‘Connectivity of Fatou components’, Oberwolfach Rep. 6 (2009), 29462948.
[9]Bergweiler, W., Rippon, P. J. and Stallard, G. M., ‘Multiply connected wandering domains of entire functions’, Preprint, arXiv:1109.1794.
[10]Eremenko, A., unpublished manuscript, http://www.math.purdue.edu/∼eremenko/dvi/ups.pdf.
[11]Hinkkanen, A., ‘Julia sets of rational functions are uniformly perfect’, Math. Proc. Cambridge Philos. Soc. 113 (1993), 543559.
[12]Kisaka, M. and Shishikura, M., ‘On multiply connected wandering domains of entire functions’, in: Transcendental Dynamics and Complex Analysis, LMS Lecture Note Series, 348 (eds. Rippon, P. J. and Stallard, G. M.) (Cambridge University Press, Cambridge, 2008), pp. 217250.
[13]Mañé, R. and da Rocha, L. F., ‘Julia sets are uniformly perfect’, Proc. Amer. Math. Soc. 116 (1992), 251257.
[14]McMullen, C. T., Complex Dynamics and Renormalization, Annals of Mathematics Studies, 135 (Princeton University Press, Princeton, NJ, 1994).
[15]Pommerenke, Ch., ‘Uniformly perfect sets and the Poincaré metric’, Arch. Math. (Basel) 32 (1979), 192199.
[16]Schleicher, D., ‘Dynamics of entire functions’, in: Holomorphic Dynamical Systems, Lecture Notes in Mathematics, 1998 (Springer, Heidelberg–Dordrecht–London–New York, 2010), pp. 295339.
[17]Steinmetz, N., Rational Iteration (Walter de Gruyter, Berlin, 1993).
[18]Sugawa, T., ‘Various domain constants related to uniform perfectness’, Complex Variables Theory Appl. 36 (1998), 311345.
[19]Sullivan, D., ‘Quasiconformal homeomorphisms and dynamics I. Solution of the Fatou–Julia problem on wandering domains’, Ann. of Math. (2) 122 (1985), 401418.
[20]Töpfer, H., ‘Über die Iteration der ganzen transzendenten Funktionen, insbesondere von sin z und cos z’, Math. Ann. 117 (1939), 6584.
[21]Zheng, J. H., ‘On uniformly perfect boundaries of stable domains in iteration of meromorphic functions’, Bull. Lond. Math. Soc. 32 (2000), 439446.
[22]Zheng, J. H., ‘Uniformly perfect sets and distortion of holomorphic functions’, Nagoya Math. J. 164 (2001), 1733.
[23]Zheng, J. H., ‘On multiply-connected Fatou components in iteration of meromorphic functions’, J. Math. Anal. Appl. 313 (2006), 2437.
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