Berlin 2024 – scientific programme
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BP: Fachverband Biologische Physik
BP 35: Active Matter V (joint session BP/DY)
BP 35.7: Invited Talk
Friday, March 22, 2024, 11:15–11:45, H 1028
Large scale collective dynamics of bacteria suspensions — •Eric Clement1, Benjamin Perez Estay1, Anke Lindner1, Carine Douarche2, Jochen Arlt3, Vincent Martinez3, Wilson Poon3, and Alexander Morosov3 — 1PMMH-ESPCI, Sorbonne University, Paris , France — 2FAST, University Paris-Saclay — 3School of Physics & Astronomy, University of Edinburgh
Fluids laden with swimming micro-organisms have become a rich domain of applications and a conceptual playground for the statistical physics of active matter. Such active bacterial fluids display original emergent phases as well as unconventional macroscopic transport properties, hence leading to revisit standard concepts in the physics and hydrodynamics of suspensions.
Here, I will present and discuss some recent advances on the spontaneous emergence of a "critical fluid" state for dense bacteria suspensions, characterized by a vanishing viscosity and and a divergent "active turbulence" scale controlled by the confinement. Close to the transition I will also describe a novel collective state leading to very large scale coherent motion of the bacteria.
Keywords: active matter; bacteria fluid; collective motion; microswimmers; active suspensions