Sebastián Barbieri Lemp

Overview

My research aims to study the rich interplay between the dynamics of group actions and computability to further understand both phenomena from a unified perspective.

A more detailed exposition can be found by clicking on my self portrait on the right.



Publications



Preprints


Markovian properties of continuous group actions: algebraic actions, entropy and the homoclinic group.
With Felipe García Ramos and Hanfeng Li.

Journals


Gibbsian representations of continuous specifications: the theorems of Kozlov and Sullivan revisited.
With Ricardo Gómez, Brian Marcus, Tom Meyerovitch and Siamak Taati.
To appear in Communications in Mathematical Physics.
On the entropies of subshifts of finite type on countable amenable groups.
To appear in Groups, Geometry and Dynamics.
A hierarchy of topological systems with completely positive entropy.
With Felipe García-Ramos.
To appear in Journal d'Analyse Mathématique.
Equivalence of relative Gibbs and relative equilibrium measures for actions of countable amenable groups.
With Ricardo Gómez, Brian Marcus and Siamak Taati.
Nonlinearity, 33(5):2409–2454, 2020.
A geometric simulation theorem on direct products of finitely generated groups.
Discrete Analysis, 9:25, 2019.
A generalization of the simulation theorem for semidirect products.
With Mathieu Sablik.
Ergodic Theory and Dynamical Systems, 39(12):3185–3206, 2019.
Realization of aperiodic subshifts and uniform densities in groups.
With Nathalie Aubrun and Stéphan Thomassé.
Groups, Geometry, and Dynamics, 13(1):107–129, 2019.
A notion of effectiveness for subshifts on finitely generated groups.
With Nathalie Aubrun and Mathieu Sablik.
In Theoretical Computer Science, 661:35–55, 2017.

International Conferences


The domino problem is undecidable on surface groups.
With Nathalie Aubrun and Etienne Moutot.
44th International Symposium on Mathematical Foundations of Computer Science (MFCS 2019), pages 1–14, 2019.
The domino problem for self-similar structures.
With Mathieu Sablik.
Pursuit of the Universal (CIE 2016), pages 205–214, 2016.
The group of reversible Turing machines.
With Jarkko Kari and Ville Salo.
Cellular Automata and Discrete Complex Systems (AUTOMATA 2016), pages 49–62, 2016.

Book chapters


About the Domino Problem for Subshifts on Groups.
With Nathalie Aubrun and Emmanuel Jeandel.
Sequences, Groups, and Number Theory, pages 331–389. Springer International Publishing, 2018.

Thesis and Memoires


Shift spaces on groups: computability and dynamics.
Theses, Université de Lyon (ENS de Lyon), June 2017.
Tilings on different structures: exploration towards two problems.
Mémoire Master 2, 2014.
  • Subshifts generados por sustituciones multidimensionales.
    Memoria ingeniería Universidad de Chile, 2014.