Dynamical Response of Passive and Active Particles to Time-Periodic Mechanical Forcing
- 107 Downloads
The presence of active forces in various biological and artificial systems may change how those systems behave when forced. We present a minimal model of a suspension of passive or active swimmers driven on the boundaries by time-dependent forcing. In particular, we consider a time-periodic drive from which we determine the linear response functions of the suspension. The meaning of these response functions are interpreted in terms of the storage and dissipation of energy through the particles within the system. We find that while a slowly driven active system responds in a way similar to a passive system with a re-defined diffusion constant, a rapidly driven active system exhibits a novel behavior related to a change in the motoring activity of the particles due to the external drive.
KeywordsActive matter Linear response theory Non-equilibrium statistical physics Time-periodic forcing
This work was supported primarily by the MRSEC Program of the National Science Foundation under Award Number DMR-1420073. We thank J.-F. Joanny and W. Srinin for stimulating discussions and their insightful comments. We were fortunate to have worked in the same department with Pierre Hohenberg and one of us (AYG) had the opportunity to discuss with him this work at its early stages. We therefore feel honored to submit this paper to the journal dedicated to his memory.
- 22.Bi, D., Yang, X., Marchetti, M.C., Manning, M.L.: Motility-driven glass and jamming transitions in biological tissues. Phys. Rev. X 6, 021011 (2016)Google Scholar