Mar 8 – 10, 2017
Nordita, Stockholm
Europe/Stockholm timezone

Collective behaviours in dry and wet active matter

Mar 9, 2017, 11:00 AM
45m
122:026 (Nordita, Stockholm)

122:026

Nordita, Stockholm

Speaker

Joakim Stenhammar (Lund University)

Description

"Active matter" is usually defined as materials that are driven out of thermodynamic equilibrium at the microscopic scale, usually by the persistent conversion of chemical fuel into motion. Such materials are often characterized as either "dry", dominated by frictional damping, or "wet", dominated by interactions mediated by a momentum-conserving solvent. Because of their strong deviation from equilibrium, these two classes of active matter exhibit very different, although equally intriguing, collective behaviours. In this talk, I will analyze two such classes of collective behaviours occuring in simple model systems of active matter, namely 1) "motility-induced phase separation", whereby active particles that interact solely through excluded volume interactions undergo a separation into dense and dilute phases, and 2) "bacterial turbulence", the hydrodynamically mediated transition into a coherently flowing state observed in dipolar microswimmers such as swimming bacteria.

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