On Subharmonic and Entire Functions of Small Order: After Kjellberg

Rippon, Philip J. and Stallard, Gwyneth M. (2021). On Subharmonic and Entire Functions of Small Order: After Kjellberg. International Mathematics Research Notices, 2021(18) pp. 14267–14295.

DOI: https://doi.org/10.1093/imrn/rnab060

Abstract

We give a general method for constructing examples of transcendental entire functions of given small order, which allows precise control over the size and shape of the set where the minimum modulus of the function is relatively large. Our method involves a novel technique to obtain an upper bound for the growth of a positive harmonic function defined in a certain type of multiply connected domain, based on comparing the Harnack metric and hyperbolic metric, which gives a sharp estimate for the growth in many cases.

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