The image of random analytic functions: coverage of the complex plane via branching processes

Alon Nishry; Elliot Paquette

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arXiv · 2403.19380

The image of random analytic functions: coverage of the complex plane via branching processes

Alon Nishry·Elliot Paquette

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Abstract

We consider the range of random analytic functions with finite radius of convergence. We show that any unbounded random Taylor series with rotationally invariant coefficients has dense image in the plane. We moreover show that if in addition the coefficients are complex Gaussian with sufficiently regular variances, then the image is the whole complex plane. We do this by exploiting an approximate connection between the coverage problem and spatial branching processes. This answers a long-standing open question of J.-P. Kahane, with sufficient regularity.

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Alon Nishry, Elliot Paquette. 2024-03-28. The image of random analytic functions: coverage of the complex plane via branching processes. https://arxiv.org/abs/2403.19380

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