Kinetic theory of long-range interacting systems -- The example of galactic nuclei
| When |
Mar 09, 2026
from 10:45 to 11:45 |
|---|---|
| Where | Amphi Anne L'Huillier |
| Contact Name | Etera Livine |
| Attendees |
Jean-Baptiste Fouvry |
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Most galaxies harbor a supermassive black hole in their centre around which orbits a stellar cluster, the galactic nucleus. The unique proximity of the Milky-Way's central black hole, SgrA*, offers an extraordinary opportunity to study such a crowded environment. Although
galactic nuclei are among the densest stellar systems in the universe, the steep potential well generated by the central black hole allows for efficient orbital interactions between the stars. Ultimately, this drives the relaxation of the stellar orbits through an intricate hierarchy of dynamical processes. In this presentation, using galactic nuclei as a pretext, I will report on recent developments in the kinetic theory of long-range interacting systems, focusing on the main ideas/methods on which they rely. In particular, I will mention the use of quasilinear kinetic equations, turbulence theory, phase transitions, renormalisation theory, or large deviation theory. Hopefully, some of these techniques will prove insightful and inspiring in the wider context of theoretical physics.