I am a Professor of Mathematics at IMPA Tech. My research focuses on discrete probability, random graphs, random walks, and a bit probabilistic combinatorics.
  • preprint Rodrigo Ribeiro. "A Martingale Approach to Large-$θ$ Ewens-Pitman Model." 2025.

    We investigate the asymptotic behavior of the number of parts $K_n$ in the Ewens--Pitman partition model under the regime where the diversity parameter is scaled linearly with the sample size, that...

  • accepted Pamela E. Harris, Rodrigo Ribeiro, Mei Yin. "Probabilistic $(m,n)$-Parking Functions." Electronic Journal of Combinatorics. 2025.

    In this article, we establish new results on the probabilistic parking model (introduced by Durm\'ic, Han, Harris, Ribeiro, and Yin) with $m$ cars and $n$ parking spots and probability parameter...

  • published Janos Engländer, Giulio Iacobelli, Gábor Pete, Rodrigo Ribeiro. "Structural results for the tree builder random walk." The Annals of Applied Probability. 35 (2) 2025.

    We study the Tree Builder Random Walk: a randomly growing tree, built by a walker as she is walking around the tree. Namely, at each time $n$, she adds a leaf to her current vertex with probability...

  • published Rodrigo Ribeiro. "Renewal structure of the tree builder random walk." Stochastic Processes and their Applications. 190 104725, 2025.

    In this paper, we study a class of random walks that build their own tree. At each step, the walker attaches a random number of leaves to its current position. The model can be seen as a subclass...

talks: past

Renewal Structure for the TBRW
Stochastic Reinforcement Processes BIRS - Canada

September 2, 2025

The Tree Builder Random Walk
Probability Seminar University of Utah

April 12, 2023

On Random Walks that change their own environment
Seminars of the Math Departament NYU Shangai

April 1, 2023

Preferential Attachment Random Graphs with Edge Steps
Combinatorics Seminar University of Illinois

February 20, 2023

ongoing courses

Aprendizado de Máquina I (Machine Learning) (MD 22)
IMPA Tech

Este curso é uma introdução prática e conceitual ao aprendizado de máquina. Vamos estudar os principais métodos supervisionados e não...

August 11, 2025 - December 5, 2025

Posts

April 13, 2025

Writing the TBRW R package

In developing the R package `tbrw` for simulating the Tree Builder Random Walk (TBRW), my initial use of the graph management library `igraph` quickly revealed severe efficiency limitations for...

April 13, 2025

Simulating the Tree Builder Random Walk in R with tbrw

The tbrw R package enables easy simulation and visualization of the Tree Builder Random Walk (TBRW), a stochastic process where a walker dynamically expands a tree by adding new vertices at each...