Regensburg 2025 – wissenschaftliches Programm
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DY: Fachverband Dynamik und Statistische Physik
DY 24: Focus Session: Broken Symmetries in Statistical Physics - Dynamics of Odd Systems
DY 24.4: Vortrag
Mittwoch, 19. März 2025, 16:00–16:15, H43
Active pattern formation emergent from single-species nonreciprocity — Zhi-Feng Huang1, •Michael te Vrugt2, Jonas Mayer Martins3, Raphael Wittkowski3,4, and Hartmut Löwen5 — 1Department of Physics and Astronomy, Wayne State University, Detroit, Michigan 48201, USA — 2Institut für Physik, Johannes Gutenberg-Universität Mainz, 55128 Mainz, Germany — 3Institut für Theoretische Physik, Universität Münster, 48149 Münster, Germany — 4Center for Soft Nanoscience, Universität Münster, 48149 Münster, Germany — 5Institut für Theoretische Physik II: Weiche Materie, Heinrich-Heine-Universität Düsseldorf, 40225 Düsseldorf, Germany
Nonreciprocal interactions violating Newton’s third law are common in a plethora of nonequilibrium situations ranging from predator-prey systems to the swarming of birds and effective colloidal interactions under flow. Here (arXiv:2404.10093), we systematically derive a field theory for the basic case of a single-component system breaking the actio and reactio equality of force within the same species from the microscopic particle dynamics, leading to a generic continuum model termed Active Model N. One particular new characteristic pattern found in this model is an interwoven self-knitting “yarn” structure with a unique feature of simultaneous development of micro- and bulk phase separations. The growth dynamics of a “ball-of-wool” active droplet towards these self-knitted yarn or branched states exhibits a crossover between different scaling behaviors.
Keywords: Nonreciprocal interactions; Active matter; Field theory