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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 11: Active Fluids and Microswimmers (joint session DY/BP/CPP)

CPP 11.2: Talk

Monday, March 18, 2024, 15:30–15:45, BH-N 243

Entropy production in active turbulence — •Byjesh N. Radhakrishnan, Thomas L. Schmidt, and Etienne Fodor — Department of Physics and Material science, University of Luxembourg

Active particles like bacteria and sperm cells sustain a continuous intake and dissipation of energy. Consequently, they are intrinsically out of equilibrium which leads to a non-vanishing entropy production rate (EPR) even in steady states. Quantifying how the EPR varies in different collective phases is crucial in developing a thermodynamic framework for active matter. In this work, we look at the EPR in active turbulence. We use Active Model H, a continuum model for active particles in a momentum-conserving fluid, to study turbulence in contractile scalar active systems. We measure the local EPR in numerical simulations, which unveils the relation between the magnitude of entropy production and +1/2 topological defects in the system. Also, we study how EPR and the properties of defects such as mean square displacement and defect lifetime vary with the activity parameter.

Keywords: active turbulence; topological defects; entropy production rate