# Value distribution of derivatives in polynomial dynamics

## TL;DR

This paper proves the equidistribution of derivatives of polynomial iterates towards harmonic measures, extending to non-archimedean, arithmetic, and complex Hénon-type polynomial automorphisms, revealing deep distributional properties.

## Contribution

It establishes new equidistribution results for derivatives of polynomial iterates in complex, non-archimedean, and arithmetic settings, including Hénon maps.

## Key findings

- Derivatives' pull-backs equidistribute towards harmonic measure.
- Results extend to Berkovich spaces and number fields.
- Distribution of eigenvalues in Hénon maps analyzed.

## Abstract

For every $m\in\mathbb{N}$, we establish the equidistribution of the sequence of the averaged pull-backs of a Dirac measure at any given value in $\mathbb{C}\setminus\{0\}$ under the $m$-th order derivatives of the iterates of a polynomials $f\in \mathbb{C}[z]$ of degree $d>1$ towards the harmonic measure of the filled-in Julia set of $f$ with pole at $\infty$. We also establish non-archimedean and arithmetic counterparts using the potential theory on the Berkovich projective line and the adelic equidistribution theory over a number field $k$ for a sequence of effective divisors on $\mathbb{P}^1(\overline{k})$ having small diagonals and small heights. We show a similar result on the equidistribution of the analytic sets where the derivative of each iterate of a H\'enon-type polynomial automorphism of $\mathbb{C}^2$ has a given eigenvalue.