Effective temperature of active matter.
@article{Loi2008EffectiveTO, title={Effective temperature of active matter.}, author={Davide Loi and Stefano Mossa and Leticia F. Cugliandolo}, journal={Physical review. E, Statistical, nonlinear, and soft matter physics}, year={2008}, volume={77 5 Pt 1}, pages={ 051111 } }
We follow the dynamics of an ensemble of interacting self-propelled motorized particles in contact with an equilibrated thermal bath. We find that the fluctuation-dissipation relation allows for the definition of an effective temperature that is compatible with the results obtained using a tracer particle as a thermometer. The effective temperature takes a value which is higher than the temperature of the bath, and it is continuously controlled by the motor intensity.
113 Citations
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The fluctuation–dissipation relation allows for the definition of an effective temperature that is compatible with the results obtained by using a tracer particle as a thermometer and an intriguing linear dependence on the tracer diffusion constant times the density of the embedding matrix.
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- PhysicsPhysical review. E
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This work quantifies the irreversibility for a noninteracting active particle in two dimensions by treating both conjugated and time-reversed dynamics and identifies a hidden rate of entropy production required to maintain persistence and prevent the rapidly relaxing momenta from thermalizing, even in the limit of very large friction.
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With an increase in background dissipation, the difference between active temperature and the background solvent temperature decreases and the difference is found to eventually vanish in the overdamped limit, demonstrating the correctness of the calculation.
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