Abstract.
The dynamics within active fluids, driven by internal activity of the self-propelled particles, is a subject of intense study in non-equilibrium physics. These systems have been explored using simulations, where the motion of a passive tracer particle is followed. Similar studies have been carried out for a soft glassy material that is driven by shearing its boundaries. In both types of systems the non-equilibrium motion have been quantified by defining a set of “effective temperatures”, using both the tracer particle kinetic energy and the fluctuation-dissipation relation. We demonstrate that these effective temperatures extracted from the many-body simulations fit analytical expressions that are obtained for a single active particle inside a visco-elastic fluid. This result provides testable predictions and suggests a unified description for the dynamics inside active systems.
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14 February 2019
The authors were notified by their collaborators Golan Bel and Dan Wexler that the expression for the over-damped limit of the kinetic energy of the trapped particle, that they have used in the orignal paper, was in error. They provide the correct expressions in this erratum.
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Nandi, S.K., Gov, N.S. Effective temperature of active fluids and sheared soft glassy materials. Eur. Phys. J. E 41, 117 (2018). https://doi.org/10.1140/epje/i2018-11731-7
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DOI: https://doi.org/10.1140/epje/i2018-11731-7