Journal
PHYSICAL REVIEW LETTERS
Volume 117, Issue 9, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.117.098001
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Funding
- ANR project Bactterns
- I-CORE Program of the Planning and Budgeting Committee of the Israel Science Foundation
- Israel Science Foundation grant
- Gordon and Betty Moore foundation
- NSF [DMR-12-06323]
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [1206323] Funding Source: National Science Foundation
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We study, from first principles, the pressure exerted by an active fluid of spherical particles on general boundaries in two dimensions. We show that, despite the nonuniform pressure along curved walls, an equation of state is recovered upon a proper spatial averaging. This holds even in the presence of pairwise interactions between particles or when asymmetric walls induce ratchet currents, which are accompanied by spontaneous shear stresses on the walls. For flexible obstacles, the pressure inhomogeneities lead to a modulational instability as well as to the spontaneous motion of short semiflexible filaments. Finally, we relate the force exerted on objects immersed in active baths to the particle flux they generate around them.
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