# Chromatic Zeros On Hierarchical Lattices and Equidistribution on Parameter Space

## TL;DR

This paper studies the distribution of chromatic zeros in hierarchical lattices, proving convergence to a limiting measure and analyzing its properties using advanced techniques from holomorphic dynamics.

## Contribution

It introduces a new equidistribution theorem linking chromatic zeros to activity currents, with applications to hierarchical lattice models.

## Key findings

- The sequence of measures on chromatic zeros converges to a limiting measure.
- The support of the limiting measure for the Diamond Hierarchical Lattice has Hausdorff dimension two.
- A novel connection between chromatic zeros and activity/bifurcation currents is established.

## Abstract

Associated to any finite simple graph $\Gamma$ is the chromatic polynomial $P_\Gamma(q)$ whose complex zeroes are called the chromatic zeros of $\Gamma$. A hierarchical lattice is a sequence of finite simple graphs $\{\Gamma_n\}_{n=0}^\infty$ built recursively using a substitution rule expressed in terms of a generating graph. For each $n$, let $\mu_n$ denote the probability measure that assigns a Dirac measure to each chromatic zero of $\Gamma_n$. Under a mild hypothesis on the generating graph, we prove that the sequence $\mu_n$ converges to some measure $\mu$ as $n$ tends to infinity. We call $\mu$ the limiting measure of chromatic zeros associated to $\{\Gamma_n\}_{n=0}^\infty$. In the case of the Diamond Hierarchical Lattice we prove that the support of $\mu$ has Hausdorff dimension two. The main techniques used come from holomorphic dynamics and more specifically the theories of activity/bifurcation currents and arithmetic dynamics. We prove a new equidistribution theorem that can be used to relate the chromatic zeros of a hierarchical lattice to the activity current of a particular marked point. We expect that this equidistribution theorem will have several other applications.