Collective motion in large deviations of active particles

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• Yann-Edwin Keta, University of Montpellier
• Tuesday 02 March 2021, 13:00-14:00
• via zoom, meeting ID 940-1803-7756.

If you have a question about this talk, please contact Camille Scalliet.

Zoom link: https://maths-cam-ac-uk.zoom.us/j/94018037756

We analyse collective motion that occurs during rare (large deviation) events in systems of active particles, both numerically and analytically. We discuss the associated dynamical phase transition to collective motion, which occurs when the active work is biased towards larger values, and is associated with alignment of particles’ orientations. A finite biasing field is needed to induce spontaneous symmetry breaking, even in large systems. Particle alignment is computed exactly for a system of two particles. For many-particle systems, we analyse the symmetry breaking by an optimal-control representation of the biased dynamics, and we propose a fluctuating hydrodynamic theory that captures the emergence of polar order in the biased states.

This talk is part of the DAMTP Statistical Physics and Soft Matter Seminar series.

This talk is included in these lists:

• All CMS events
• DAMTP Statistical Physics and Soft Matter Seminar
• Soft Matter
• bld31
• via zoom, meeting ID 940-1803-7756

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