Journal
PHYSICAL REVIEW LETTERS
Volume 106, Issue 21, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.106.218101
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Funding
- NSF Brandeis MRSEC
- NSF Harvard MRSEC
- NIAID [R01AI080791]
- Harvard Kavli Institute for Nanobio Science Technology
- MacArthur Foundation
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [0820492] Funding Source: National Science Foundation
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [820484] Funding Source: National Science Foundation
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We analyze a model of mutually propelled filaments suspended in a two-dimensional solvent. The system undergoes a mean-field isotropic-nematic transition for large enough filament concentrations, and the nematic order parameter is allowed to vary in space and time. We show that the interplay between nonuniform nematic order, activity, and flow results in spatially modulated relaxation oscillations, similar to those seen in excitable media. In this regime the dynamics consists of nearly stationary periods separated by bursts'' of activity in which the system is elastically distorted and solvent is pumped throughout. At even higher activity, the dynamics becomes chaotic.
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