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Nonequilibrium Statistical Mechanics - Collective behavior of active particles


Vachier,  Jérémy
Group Non-equilibrium soft matter, Department of Dynamics of Complex Fluids, Max Planck Institute for Dynamics and Self-Organization, Max Planck Society;

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Vachier, J. (2020). Nonequilibrium Statistical Mechanics - Collective behavior of active particles. PhD Thesis, Georg-August-Universität, Göttingen.

Cite as: http://hdl.handle.net/21.11116/0000-0007-B469-8
Active matter is everywhere, from macroscopic to microscopic scales, we find systems such as human crowd or flock of birds as well as bacterial colonies. These systems composed of particles are able to convert their surrounding energy into motion, and naturally exist out of thermodynamic equilibrium. At the microscopic scale, a specific class of active particles is particularly interesting: called microswimmers, these are biological or artificial micro-sized particles able to move in a fluid, such as bacteria or chemically driven Janus particles. In nature, these microswimmers rarely swim alone and can exhibit intriguing collective behavior at interfaces such as cluster formation, as well as swarming, swirling, raft and biofilm formation. The fundamental mechanisms of the emergence of collective behavior for living and inanimate active systems is not yet understood, especially because these systems are far from equilibrium, where our experimental and theoretical understanding is limited. This thesis aims to elucidate the impact of the activity on the emergence of collective behavior in an active system, at a microscopic level, by using a stochastic approach, over three works, from active sedimenting particles to early biofilm formation in the case of the bacteria Pseudomonas aereginosa, via the aggregation formation for the micro-algae Chlamydomonas reinhardtii.