Vertices with fixed outdegrees in large Galton-Watson trees
Abstract
We are interested in nodes with fixed outdegrees in large conditioned Galton--Watson trees. We first study the scaling limits of processes coding the evolution of the number of such nodes in different explorations of the tree (lexicographical order and contour order) starting from the root. We give necessary and sufficient conditions for the limiting processes to be centered, thus measuring the linearity defect of the evolution of the number of nodes with fixed outdegrees. This extends results by Labarbe & Marckert in the case of the contour-ordered counting process of leaves in uniform plane trees. Then, we extend results obtained by Janson concerning the asymptotic normality of the number of nodes with fixed outdegrees.
Keywords
Cite
@article{arxiv.1812.07365,
title = {Vertices with fixed outdegrees in large Galton-Watson trees},
author = {Paul Thévenin},
journal= {arXiv preprint arXiv:1812.07365},
year = {2020}
}
Comments
25 pages, 3 figures. Typos corrected, a multivariate local limit theorem (Theorem 2.4) added which helps prove joint convergences of random processes. A generalization to stable distributions is developed in Section 6