Regensburg 2025 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 25: Poster: Active Matter, Soft Matter, Fluids (joint session DY/CPP)

CPP 25.9: Poster

Mittwoch, 19. März 2025, 10:00–12:00, P3

Fundamental Measure Theory for active hard discs — •Jonas Buba and Michael Schmiedeberg — Theoretical Physics: Lab for Emergent Phenomena, Friedrich-Alexander-Universität Erlangen-Nürnberg, 91058 Erlangen, Germany

The behavior of active soft particles has been studied extensively and provides a good model for many active matter systems [1]. However, some systems might be described more accurately by considering hard particles instead. While active soft particles have been described with a Phase Field Crystal approach (e.g., in [2]), a similar description of active hard particles is still lacking. In our approach we use Fundamental Measure Theory [3] to model hard discs and add activity. We expect to gain further insight into the role that the particle type can play in dynamical pattern formation.

[1] Marchetti M C, Joanny J F, Ramaswamy S, Liverpool T B, Prost J, Rao M and Simha R A. Hydrodynamics of soft active matter. Rev. Mod. Phys. 85 1143, 2013. [2] Arold D and Schmiedeberg M. Mean field approach of dynamical pattern formation in underdamped active matter with short-ranged alignment and distant anti-alignment interactions. J. Phys.: Condens. Matter 32 315403, 2020. [3] Roth R, Mecke K, and Oettel M. Communication: Fundamental measure theory for hard disks: Fluid and solid. The Journal of Chemical Physics, 136(8):081101, 2012.

Keywords: active hard particles; fundamental measure theory; dynamical pattern formation