MPI-DS Seminar: Compact expansion of a repulsive suspension

MPI-DS Seminar

  • Datum: 21.07.2025
  • Uhrzeit: 14:15 - 15:15
  • Vortragende(r): Naomi Oppenheimer
  • School of Physics and Astronomy, Tel Aviv University, Israel
  • Ort: Max-Planck-Institut für Dynamik und Selbstorganisation (MPIDS)
  • Raum: Maria Göppert Room (0.79) and Zoom Meeting ID 959 2774 3389 Passcode: 651129
  • Gastgeber: MPI-DS
  • Kontakt: eberhard.bodenschatz@ds.mpg.de
Repulsive interactions govern the dynamics of matter from atoms to animals. Using theory, simulations, and experiments, we find that an ensemble of repulsive particles spreads compactly with a sharp boundary, in contrast to the diffusive spreading of Brownian particles. Starting from the pair interactions, at high densities, the many-body dynamics follow nonlinear diffusion with a self-similar expansion. We give theoretical predictions that we verify experimentally and numerically for the scaling of the dynamics for various forms of potentials. When the interactions are long-ranged, the system retains a long-lived memory of the original pattern. We demonstrate that below a threshold, the initial distribution seeds the resulting pattern, encoding the future structure of an unconfined and dynamically evolving system.
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