POLS Project
DYNCOMP

About

The POLS project Dynamical complexity and pseudometrics (DynComp) is conducted at the Faculty of Mathematics and Computer Science of the Jagiellonian University in Kraków. It is funded by the Norway Grants via the National Science Center (NCN) of Poland. Some further project details together with a description for the general public can be found here.
Team members
Dr Maik Gröger (principal investigator), Habibeh Pourmand (Phd student) and Karol Rutkowski (master's student)
Scope of the project
... A central goal of topological dynamics and ergodic theory is the classification of dynamical systems up to an appropriate notion of isomorphisms. Dynamically defined pseudometrics turn out to be an useful tool to achieve this task. Moreover, they can induce interesting dynamical invariants reflecting certain long-term behavior and complexity of a system. The aim of this project is to extend our understanding of dynamically defined pseudometrics for continuous actions of topological groups and to examine the corresponding complexity notions which they induce. Hereby, we are particularly interested in systems exhibiting low complexity behaviour (in the sense that they have zero entropy whenever the acting group allows for establishing a reasonable entropy theory). Prominent examples belonging to this class are systems which are defined by finitely many local rules and point set dynamical systems associated to regular model sets. Here, primary examples come from the theory of aperiodic order which provide mathematical models for quasicrystals.

Publications

Preprints

On continuum real trees of circle maps and their graphs
M. Gröger and S. Troscheit, 24 pages, preprint 2024
On the continuity of Følner averages
G. Fuhrmann, M. Gröger and T. Hauser, 15 pages, preprint 2023

Peer-reviewed research articles

Amorphic complexity of group actions with applications to quasicrystals
G. Fuhrmann, M. Gröger, T. Jäger and D. Kwietniak, Trans. Am. Math. Soc. 376:2395-2418 (2023)
On the properties of the mean orbital pseudo-metric
F. Cai, D. Kwietniak, J. Li and H. Pourmand, J. Differ. Equ. 318:1-19 (2022)

Activities and outreach

Wandering Seminar 2023
Organizers: M. Frączyk, M. Gröger and D. Kwietniak (28-30 September, Kraków, Poland, webpage)
Kraków's Recurrence 2022 - kick-off meeting JU Dynamical Systems Seminar
Organizers: M. Gröger, P. Kunde and D. Kwietniak (30 September-1 October 2022, Kraków, Poland, webpage)

Contact

Address
Faculty of Mathematics and Computer Science
Jagiellonian University
ul. Prof. S. Łojasiewicza 6
30-348 Kraków, Poland
Phone
+48 12 664 76 39
Email
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