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Jun 7 – 17, 2022
Institut Pascal
Europe/Paris timezone

Dense disordered active matter

Jun 17, 2022, 2:00 PM
1h
Institut Pascal

Institut Pascal

Rue André Rivière 91400 Orsay

Speaker

Prof. Lisa Manning (Syracuse University)

Description

In active materials energy is injected at the scale of individual units, instead of at the boundaries as in sheared materials, and the motion is not governed by a thermal bath. At low and intermediate densities, broken time-reversal invariance can lead to interesting and well-studied phenomena like giant number fluctuations and motility-induced phase separation. In contrast, at high densities such macroscopic density fluctuations are suppressed, and the structure of the material is very similar to a disordered solid, while the dynamics exhibit interesting flows with non-trivial features such as long-range spatial correlations in the velocity field, intermittency, and avalanche dynamics.Inthe first lecture, I will discuss several frameworks that have been developed to understand the origin of long-range spatial correlations in the particle velocities/displacements [1,2]. In the second lecture, I will discuss intermittency, avalanches, and yielding in dense active matter, including recent work highlighting a direct link between active matter and sheared systems in the limit of infinite persistence [3,4].

References:[1] Szamel, G., & Flenner, E. (2021). Long-ranged velocity correlations indense systems of self-propelled particles. EPL (Europhysics Letters), 133(6), 60002.

[2] Henkes, S., Kostanjevec, K., Collinson, J. M., Sknepnek, R., & Bertin, E. (2020). Dense active matter model of motion patterns in confluent cell monolayers. Nature communications, 11(1), 1-9.

[3] Mandal, R., Bhuyan, P. J., Chaudhuri, P., Dasgupta, C., & Rao, M. (2020). Extreme active matter at high densities. Nature communications, 11(1), 1-8.

[4] Morse, P. K., Roy, S., Agoritsas, E., Stanifer, E., Corwin, E. I., & Manning, M. L. (2021). A direct link between active matter and sheared granular systems. Proceedings of the National Academy of Sciences, 118(18

Presentation materials