Camille Horbez

Camille Horbez

French version

I am "chargé de recherche" at the CNRS at the Laboratoire de Mathématiques d'Orsay, in the Topology and Dynamics team.
Here you can find a CV.

Contact information

Laboratoire de Mathématiques d'Orsay
Université Paris-Saclay, Batiment 307
F-91405 Orsay Cedex, France
Office: 3R17
Tel: +33 1 69 15 57 99
E-mail: camille.horbez "at"

ERC Starting Grant project

I am the PI of the ERC StG project "Artin groups, mapping class groups and Out(Fn): from geometry to operator algebras via measure equivalence" (Artin-Out-ME-OA, Grant 101040507).
Project member : Amandine Escalier (post-doctoral researcher)

Research interests

My research domain is geometric group theory, I am particularly interested in the study of the group Out(F_N) of outer automorphisms of a free group through its action on geometric complexes, such as Outer space or some hyperbolic complexes, and their boundaries. In this context, I have been interested in subgroup classification and rigidity questions. I have also been working on random walks on mapping class groups of surfaces, and on Out(F_N). More recently, I have developed interest in measured group theory and its application to operator algebras, in particular through the study of measure equivalence rigidity phenomena for groups that have features of negative curvature.


Groups and actions, co-organized with Matthieu Joseph
(This replaces the seminar Groups and operator algebras, that I co-organized with Cyril Houdayer in 2021-2022 and 2022-2023.)

Research work


Accepted papers

Published papers



Events I organized

Upcoming events

Past events


Cours Peccot

Here are the links to the videos of my `Cours Peccot': I gave four lectures at the Collège de France in January 2018 on "Asymptotic geometry of the outer automorphism group of a free group" (in French).

Mini-course ``Measure equivalence, negative curvature, rigidity''

Given in Bangalore in March 2023 : Part 1, Part 2, Part 3, Part 4.