{
  "id": "2504.03210",
  "version": "v2",
  "published": "2025-04-04T06:49:10.000Z",
  "updated": "2025-05-04T14:21:49.000Z",
  "title": "Transfer of active motion from medium to probe via the induced friction and noise",
  "authors": [
    "Ji-Hui Pei",
    "Christian Maes"
  ],
  "categories": [
    "cond-mat.stat-mech",
    "cond-mat.soft",
    "physics.bio-ph"
  ],
  "abstract": "Can activity be transmitted from smaller to larger scales? We report on such a transfer from a homogeneous active medium to a Newtonian spherical probe. The active medium consists of faster and dilute self-propelled particles, modeled as run-and-tumble particles in 1D or as active Brownian particles in 2D. We derive the reduced fluctuating dynamics of the probe, valid for arbitrary probe velocity, characterized by velocity-dependent friction and noise. In addition to a standard passive regime, we identify peculiar active regimes where the probe becomes self-propelled with high persistence, and its velocity distribution begets peaks at nonzero values. These features are quantitatively confirmed by numerical simulations of the joint probe-medium system. The emergence of active regimes depends not only on the far-from-equilibrium nature of the medium but also on the probe-medium coupling. Our findings reveal how, solely via the induced friction and noise, persistence can cross different scales to transfer active motion.",
  "revisions": [
    {
      "version": "v2",
      "updated": "2025-05-04T14:21:49.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "active motion",
      "induced friction",
      "velocity distribution begets peaks",
      "joint probe-medium system",
      "active regimes"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 0,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}