Generic long-range interactions between bodies in an active fluid

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• Yongjoo Baek (University of Cambridge)
• Thursday 23 November 2017, 13:00-14:00
• MR11, Centre for Mathematical Sciences, Wilberforce Road, Cambridge.

If you have a question about this talk, please contact Julius Bier Kirkegaard.

It is well known that active particles in a ratchet potential generate macroscopic currents. Based on a canonical model of dry active matter, we show that these currents produce generic long-range interactions between passive bodies immersed in an active fluid. Using multipole expansions, the anisotropy and power-law behaviours of the interactions are characterised in the far-field limit. We also identify interesting pairwise dynamics of passive bodies arising from the interactions, illustrated by the spontaneous rotation of non-chiral bodies and the formation of traveling bound pairs. The occurrence of these phenomena depends on tuneable properties of the bodies, thus opening new possibilities for self-assembly mediated by active fluids.

This talk is part of the DAMTP BioLunch series.

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