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DY: Fachverband Dynamik und Statistische Physik

DY 23: Stochastic Thermodynamics

DY 23.9: Vortrag

Mittwoch, 20. März 2024, 11:45–12:00, BH-N 128

Thermodynamically consistent model of an active Ornstein-Uhlenbeck particle — •Jonas Fritz and Udo Seifert — II. Institut für Theoretische Physik, Universität Stuttgart, 70550 Stuttgart, Germany

Identifying the full entropy production of active particles is a challenging task. We introduce a microscopic, thermodynamically consistent model that leads to active Ornstein-Uhlenbeck statistics in the continuum limit [1]. Our minimal model consists of a particle with a fluctuating number of active reaction sites which contribute to its active self-propulsion on a lattice. In addition, the model also takes ordinary thermal noise into account. This approach allows us to identify the full entropy production stemming from both thermal diffusion and active driving. Extant methods based on the comparison of forward and time-reversed trajectory underestimate the physical entropy production when applied to the Langevin equations obtained from our model. Constructing microscopic Markovian models can thus provide a benchmark for determining the entropy production in non-Markovian active systems.

[1] Jonas H. Fritz and Udo Seifert, J. Stat. Mech. (2023) 093204

Keywords: Entropy production; Active Ornstein-Uhlenbeck particle; Active matter