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Non-equilibrium tracer dynamics in oscillating active gel

Author

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

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.

Suggested Citation

  • Reserva, Rosario L. & Filipinas, Jae Lord Dexter C. & Jerez, Michael Jade Y. & Confesor, Mark Nolan P., 2022. "Non-equilibrium tracer dynamics in oscillating active gel," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 603(C).
    • Handle: RePEc:eee:phsmap:v:603:y:2022:i:c:s0378437122005313
    DOI: 10.1016/j.physa.2022.127812
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    References listed on IDEAS

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    1. Sho C. Takatori & Raf De Dier & Jan Vermant & John F. Brady, 2016. "Acoustic trapping of active matter," Nature Communications, Nature, vol. 7(1), pages 1-7, April.
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