{
  "abstract": "Within a three-fluid description of heavy-ion collisions, we investigate how nuclear friction can be used to model shear stress. In this multi-fluid approach, the individual fluids (projectile, target and fireball) are each treated as locally equilibrated ideal fluids at all times, while the local energy-momentum tensor of the superposed system exhibits characteristic anisotropies in its Landau rest frame. From the corresponding non-vanishing shear stress densities and the gradients of the Landau velocity field, we infer an ``effective shear viscosity'' according to the Navier-Stokes relation. We present the time evolution of the resulting values of $η_{\\rm eff}$ and the generated entropy density in nuclear collisions at different beam energies ($1.23\\,A\\text{GeV} \\le E_{\\mathrm{lab}} \\le 29.7\\,A\\text{GeV}$). The resulting dimensionless ratio $η_{\\rm eff}/s$ is determined dynamically and self-consistently within the non-equilibrium friction model. We discuss the relation to previous calculations using alternative methods in hydrodynamics and to estimates based on microscopic transport models.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2610.20872",
  "author_total": 2,
  "authors": [
    {
      "name": "Christian Spieles"
    },
    {
      "name": "Marcus Bleicher"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/f9x2vmn0z3a8a.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2610.20872",
  "fulltext_url": null,
  "id": "f9x2vmn0z3a8a",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2610.20872",
  "language": null,
  "licence": "LicenseRef-arXiv-nonexclusive-1.0",
  "licence_label": "arXiv licence",
  "licence_source": "article",
  "licence_url": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
  "metadata_licence": "CC0-1.0",
  "native_subjects": [
    [
      "arxiv",
      "nucl-th"
    ],
    [
      "openalex",
      "3106|High-Energy Particle Collisions Research"
    ]
  ],
  "openalex": "W7222622681",
  "pdf_url": "https://arxiv.org/pdf/2610.20872",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-14",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/f9x2vmn0z3a8a.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:29:50Z",
      "native_id": "2610.20872",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2610.20872"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:nucl-th",
      "subfield": "nuclear"
    }
  ],
  "title": "Effective shear viscosity from the friction term in relativistic multi-fluid hydrodynamics",
  "title_text": "Effective shear viscosity from the friction term in relativistic multi-fluid hydrodynamics",
  "type": "preprint",
  "updated_at": "2026-10-30T12:29:50Z",
  "url": "https://research.draconitic.com/paper/f9x2vmn0z3a8a",
  "venue": "arXiv",
  "versions": []
}