Dresden 2026 – scientific programme

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DY: Fachverband Dynamik und Statistische Physik

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

DY 44.2: Poster

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

Emergent Interaction in Attractively Coupled Active Particles — •Ritwick Sarkar and Urna Basu — S. N. Bose National Centre for Basic Sciences, India.

We investigate the dynamics of N pair-wise harmonically coupled active Brownian particles (ABPs) in the presence of thermal fluctuations. The harmonic coupling and the bounded nature of the active noise ensure that the relative distance between each pair of particles eventually reaches a stationary state. Depending on the interplay between the active time-scale and the relaxation time-scale associated with the harmonic coupling, three regimes emerge: strong, moderate, and weak coupling. We analytically show that in the strong coupling regime, an effective short-range repulsion emerges between ABP pairs with speed heterogeneity, both in the presence and absence of thermal fluctuations. The short-range repulsion also persists when the ABP pairs are coupled by a generic long-range attractive potential.

Reference

[1] Ritwick Sarkar, Urna Basu, Soft Matter 21, 3595-3603 (2025).

[2] Ritwick Sarkar, Sreya Chatterjee, and Urna Basu, J. Phys. A: Math. Theor. 58 415001 (2025).

Keywords: Active Brownian particle; Emergent interaction