Berlin 2018 – scientific programme

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BP: Fachverband Biologische Physik

BP 25: Active Matter DY III (joint session DY/CPP/BP)

BP 25.8: Talk

Wednesday, March 14, 2018, 17:30–17:45, BH-N 243

Entropy production of active particles and for particles in active baths — •Patrick Pietzonka^1,2 and Udo Seifert¹ — ¹II. Institut für Theoretische Physik, Universität Stuttgart, Germany — ²Department of Applied Mathematics and Theoretical Physics, University of Cambridge, UK

Entropy production of an active particle in an external potential is identified through a thermodynamically consistent minimal lattice model that includes the chemical reaction providing the propulsion and ordinary translational noise. In the continuum limit, a unique expression follows, comprising a direct contribution from the active process and an indirect contribution from ordinary diffusive motion. From the corresponding Langevin equation, this physical entropy production cannot be inferred through the conventional, yet here ambiguous, comparison of forward and time-reversed trajectories. Generalizations to several interacting active particles and passive particles in a bath of active ones are presented explicitly, further ones are briefly indicated.

[1] P. Pietzonka and U. Seifert, J. Phys. A: Math. Theor. 51, 01LT01 (2018)