Non-equilibrium tracer dynamics in oscillating active gel

Rosario L. Reserva, Jae Lord Dexter C. Filipinas, Michael Jade Y. Jerez and Mark Nolan P. Confesor

Physica A: Statistical Mechanics and its Applications, 2022, vol. 603, issue C

Abstract: Non-equilibrium features in active gels are commonly assessed by the van Hove distribution (VHD) of tracer bead displacement. For instance, pulsed stress is shown to cause side peaks in the VHD such as those induced by Myosin-II motors. Here, we report the same side peaks in the VHD of tracer beads that are periodically displaced by the shuttle streaming of Physarum polycephalum. On the other hand, the mean square displacement (MSD) of tracer trajectory includes oscillatory components, which are not expected for a pulsed stress source. Thus, the VHD and a dynamical measurement are needed to fully characterize tracer dynamics. We present a modified active trap model that fully captures the experimental data for this class of oscillating active gel.

Keywords: Physarum polycephalum; Active matter; Non-equilibrium (search for similar items in EconPapers)
Date: 2022
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Persistent link: https://EconPapers.repec.org/RePEc:eee:phsmap:v:603:y:2022:i:c:s0378437122005313

DOI: 10.1016/j.physa.2022.127812

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