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BP: Fachverband Biologische Physik
BP 19: Active Matter III (joint session DY/BP/CPP)
BP 19.7: Talk
Wednesday, March 20, 2024, 11:30–11:45, BH-N 334
From Active Chiral Particles to the Active Model B + — •Erik Kalz1, Abhinav Sharma2,3, and Ralf Metzler1,4 — 1University of Potsdam, Germany — 2University of Augsburg, Germany — 3Leibniz-Institute for Polymer Research, Dresden, Germany — 4Asia Pacific Centre for Theoretical Physics, Pohang, Republic of Korea
A first-principles approach for active chiral hard disks is presented, that explicitly accounts for steric interactions on the two-body level. With a handle on the full derivation, we explicitly point out the necessary assumptions to derive the field-theoretical description for Active Chiral Particles. By considering different regimes of the Péclet number, the well-known models in active matter can be obtained through our consideration. Explicitly, we derive the phenomenological Model B. By going to higher orders in the closure scheme, we show that this first-principles approach results in the recently introduced Active Model B +, a natural extension of Model B for active processes. Contrary to systems without chirality and to previous derivations, we find that chirality can change the sign of the characteristic activity parameters. This has profound consequences for the already shown effects in the Active Model B +. Finally, we draw a connection between Active Chiral Particles and Odd Diffusion, a phenomenon that has attracted considerable attention recently, and for which Active Chiral Particles are handled as an exemplary system.
Ref: E. Kalz, A. Sharma, and R. Metzler: arXiv preprint arXiv:2310.16691, 2023
Keywords: Active Chiral Particles; Active Model B +; first-principles approach; odd diffusion