Dresden 2026 – scientific programme

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DY: Fachverband Dynamik und Statistische Physik

DY 44: Poster: Active Matter, Soft Matter, and Fluids

DY 44.10: Poster

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

Phase properties of constant density interacting flocks — •Astik Haldar and Heiko Rieger — Center for Biophysics & Department of Theoretical Physics, Universität des Saarlandes, Saarbruecken 66123, Germany

We present a field-theoretic study of a mixture of two polar Malthusian species in two dimensions with distinct aligning and propulsion strengths. The system exhibits rich phase behavior, including oriented flocking states (both parallel and anti-parallel) and a coherently rotating chiral phase. We map the parameter regions for these phases and characterize their universal properties.

Keywords: Active matter; Nonreciprocal interaction; phase transition; Universality