Laboratoire de Physique Théorique

de la Matière Condensée

Frédéric van Wijland (MSC, Université de Paris)

Multibody effects in active particle systems, and what working in large space dimension teaches us

Systems made of a large number of self-propelled particles live very far from equilibrium, which opens the door to unexpected collective behaviors, such as the motility-induced phase separation (MIPS). While a phenomenological understanding of such phenomena was  almost immediately available, microscopics-based approaches are usually difficult to conduct. By embedding these many-body systems in a large-dimensional space, some simplifications occur, and these allow us to pinpoint fundamental physical differences between a conventional equilibrium phase separation driven by pairwise forces, and MIPS, which had eluded phenomenological, coarse-grained, descriptions. These lie in the intrinsically  many-body nature of interactions in systems of active particles.

Work done in collaboration with Thibaut Arnoulx de Pirey


En version hybride, dans la salle de séminaire du LPTMC (couloir 13-12, 5ème, salle 5-23) et sur zoom:

ID de réunion : 885 2329 4809
Code secret : 613679