Condensation of Magnetotactic Bacteria

Orateur : Jean-François RUPPRECHT (Ecole Normale Supérieure, Paris)

Magnetotactic swimmers tend to align along the magnetic field against stochastic reorientations. We show that the swimming strategy, e.g., active Brownian motion versus run-and-tumble dynamics, strongly affects the orientation statistics with the magnetic field. The latter exhibits a velocity condensation above a critical magnetic field, whereby the alignment probability density diverges. In particular, Lévy walks display a drastic reactivity at the onset of collective interactions. Our results suggest that the run-and-tumble dynamics can outperform active Brownian motion as a survival strategy.

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