Dresden 2026 – scientific programme

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DY: Fachverband Dynamik und Statistische Physik

DY 43: Poster: Statistical Physics

DY 43.6: Poster

Wednesday, March 11, 2026, 15:00–18:00, P5

Random Organization in a Many-Body Reaction System — •Mishael Derla and Michael Schmiedeberg — Soft Matter Theory Group, Theoretical Physics: Lab for Emergent Phenomena, Friedrich-Alexander-Universität Erlangen-Nürnberg, 91058 Erlangen

Random organization refers to certain simplified simulation protocols of the reversibility-irreversibility transition in sheared colloid suspensions. It displays an absorbing state transition believed to be in the conserved directed percolation universality class. We present a related analytical time-continuous many-body reaction-diffusion model. It features two species of spherical grains (of diameter σ): diffusing active grains A (with diffusion constant D), and motionless inactive grains I. A spontaneously decay A→ I with rate µ and overlapping grains react with A+I→ 2A and I+I→ 2A, respectively at rate λ. When λ≫µ≫ Dσ⁻² overlapping grains are almost certainly active and non-overlapping ones almost certainly inactive and hence a time-continuous (or small step-size) version of random-organization is recovered.

Keywords: random organization; soft matter; classical many-body physics