BPCPPDYSOE21 – wissenschaftliches Programm
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DY: Fachverband Dynamik und Statistische Physik
DY 43: Pattern Formation - organized by Azam Gholami (Göttingen)
DY 43.1: Vortrag
Mittwoch, 24. März 2021, 14:00–14:20, DYa
Suppression of coarsening in a Cahn-Hilliard model with nonreciprocal coupling — •Tobias Frohoff-Hülsmann1 and Uwe Thiele1,2 — 1Institute of theoretical physics, WWU Münster — 2Center of Nonlinear Science (CeNoS), WWU Münster
When coarsening occurs, an initial patterned state develops into a fully phase-separated state. This is standard for passive mixtures and is now also frequently discussed in the field of active matter. The Cahn-Hilliard equation is the paradigmatic description for a passive system characterized by a single conserved order parameter field, e.g., concentration for a mixture. Here, we study a two-field Cahn-Hilliard system (e.g. representing a ternary mixture). The chosen couplings maintain both conservation laws and consist of passive (reciprocal) and active (nonreciprocal) contributions. Our particular focus is the suppression of coarsening that occurs when going from the passive to the active case. We distinguish three mechanisms of suppression: Linear and nonlinear complete, and nonlinear partial suppression. They differ from the suppression of coarsening due to broken mass conservation observed in other systems.