Regensburg 2025 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 25: Poster: Active Matter, Soft Matter, Fluids (joint session DY/CPP)

CPP 25.6: Poster

Mittwoch, 19. März 2025, 10:00–12:00, P3

Fluctuation induced network patterns in spatially correlated noise — •Sebastian Fehlinger¹, Kai Cui², Arooj Sajjad¹, Heinz Koeppl², and Benno Liebchen¹ — ¹Technische Universität Darmstadt, Institut für Physik Kondensierter Materie, Hochschulstraße 8, 64289 Darmstadt — ²Technische Universität Darmstadt, Selbstorganisierende Systeme, Merkstraße 25, 64283 Darmstadt

Fluctuations play an important role in many fields of physics, from quantum electrodynamics to statistical mechanics. In active matter physics, so far, most works have focused on active particles that are subject to thermal fluctuations caused by the surrounding solvent. Here, we explore the collective behaviour of active particles under the influence of spatially correlated noise, that can arise, e.g., from fluctuating external fields. Therefore, we introduce a minimal model which describes the dynamics of (chiral) active particles with alignment interactions in a time-dependent Gaussian random field, that features a characteristic spatial correlation length, but no temporal correlations. Using Brownian dynamics simulations, we find, that the active particles aggregate to system spanning, percolated networks. These structures are (i) fluctuation-induced, (ii) feature local alignment of the contained particles, but no global alignment, and (iii) hardly show any coarsening. We systematically characterize the emerging patterns with tools from topological data analysis (persistence diagrams, Vietoris-Rips complexes and Betty numbers).

Keywords: Active chiral particles; pattern formation; fluctuations; percolated networks; topological data analysis