Dresden 2026 – scientific programme
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DY: Fachverband Dynamik und Statistische Physik
DY 17: Active Matter II (joint session DY/BP/CPP)
DY 17.12: Talk
Monday, March 9, 2026, 18:15–18:30, ZEU/0160
Flocking with random non-reciprocal interactions — •Jiwon Choi1, Jae Dong Noh2, and Heiko Rieger1 — 1Department of Physics & Center for Biophysics, Saarland University, Campus E2 6, 66123 Saarbrücken, Germany — 2Department of Physics, University of Seoul, Seoul, 02504, Korea
Flocking is ubiquitous in nature and emerges from alignment interactions among self-propelled agents. Two species that anti-align or interact non-reciprocally exhibit complex collective phenomena, ranging from parallel and anti-parallel flocking and run-and-chase behavior to chiral phases. Whether such behavior survives in the presence of many species with random non-reciprocal interactions has remained unclear. As a first step, we study a continuous-time Vicsek-like model with fully random non-reciprocal interactions between particles. For infinite-range interactions, flocking emerges once the alignment bias becomes comparable to the non-reciprocal interactions, and deep inside this phase random non-reciprocity can still support slow global chiral and oscillating states. For short-range interactions, even without alignment bias, self-organized cliques form, where medium-sized clusters with predominantly aligning interactions remain stable over long times. We further investigate the robustness of clique formation and the coexistence phase under angular noise using a discrete-time Vicsek model with random non-reciprocal interactions. These results provide a basis for studying multi-species flocking with complex non-reciprocal interactions.
Keywords: Vicsek model; Flocking; Random non-reciprocal interactions; Multi-species active systems