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arXiv · 2112.14324

Reading analytic invariants of parabolic diffeomorphisms from their orbits

Martin Klimes·Pavao Mardesic·Goran Radunovic·Maja Resman
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Abstract

In this paper we study germs of diffeomorphisms in the complex plane. We address the following problem: How to read a diffeomorphism $f$ knowing one of its orbits $\mathbb{A}$? We solve this problem for parabolic germs. This is done by associating to the orbit ${\mathbb{A}}$ a function that we call the dynamic theta function $\Theta_{\mathbb{A}}$. We prove that the function $\Theta_{\mathbb{A}}$ is $2\pi i\mathbb{Z}$-resurgent. We show that one can obtain the sectorial Fatou coordinate as a Laplace-type integral transform of the function $\Theta_{\mathbb{A}}$. This enables one to read the analytic invariants of a diffeomorphism from the theta function of one of its orbits. We also define a closely related fractal theta function $\tilde{\Theta}_{\mathbb{A}}$, which is inspired by and generalizes the geometric zeta function of a fractal string, and show that it also encodes the analytic invariants of the diffeomorphism.

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Martin Klimes, Pavao Mardesic, Goran Radunovic, Maja Resman. 2021-12-28. Reading analytic invariants of parabolic diffeomorphisms from their orbits. https://doi.org/10.2422/2036-2145.202208_022

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