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DY: Fachverband Dynamik und Statistische Physik

DY 30: Focus Session: New Trends in Nonequilibrium Physics – Conservation Laws and Nonreciprocal Interactions II

DY 30.2: Talk

Wednesday, March 20, 2024, 15:30–15:45, BH-N 243

Collective behavior of cohesive, aligning particles — •Jeanine Shea and Holger Stark — Technische Universität Berlin, Institut für Theoretische Physik, Hardenbergstr. 36, 10623 Berlin, Germany.

Collective behavior is all around us, from flocks of birds to schools of fish. These systems are immensely complex, which makes it pertinent to study their behavior through minimal models. We introduce a minimal model for cohesive and aligning self-propelled particles. In contrast to former models of this type, we establish group cohesion through non-reciprocal torques [1] as opposed to attractive forces. These torques cause constituents to effectively turn towards one another. We additionally incorporate an alignment torque. By changing the strength and range of these torque interactions, we uncover a vast array of dynamics ranging from long filaments to pear-shaped clusters. We present state diagrams to identify these different dynamic states.

[1] Knežević, M., Welker, T. and Stark, H. Collective motion of active particles exhibiting non-reciprocal orientational interactions. Sci Rep 12, 19437 (2022).

Keywords: Active matter; Nonreciprocal interactions; Collective behavior