{
  "abstract": "We present a rotation-free magnetohydrodynamic dynamo driven by laminar thermal convection in a regular tetrahedral cavity. The tetrahedral boundaries organize the convective flow into a robust pattern of helical convection cells without global rotation or turbulence. Direct numerical simulations demonstrate exponential amplification of a weak seed magnetic field followed by nonlinear saturation. In the reference calculation, the saturated magnetic energy exceeds the kinetic energy. The velocity field develops $D_4$ dihedral symmetry, while the self-generated magnetic field exhibits a corresponding signed $D_4$ symmetry, including antisymmetry under $π$ rotations about the two horizontal axes. Analysis of the velocity and magnetic-field structures reveals a closed induction cycle sustained by geometry-induced helical convection. This system provides a conceptually simple setting for isolating and understanding the fundamental physical processes underlying magnetohydrodynamic dynamo action.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2606.11781",
  "author_total": 1,
  "authors": [
    {
      "name": "Akira Kageyama"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/65f8nc59qr6sd.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2606.11781",
  "fulltext_url": null,
  "id": "65f8nc59qr6sd",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2606.11781",
  "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",
      "physics.flu-dyn"
    ],
    [
      "openalex",
      "1312|Geomagnetism and Paleomagnetism Studies"
    ]
  ],
  "openalex": "W7164410162",
  "pdf_url": "https://arxiv.org/pdf/2606.11781",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-02",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/65f8nc59qr6sd.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:26:45Z",
      "native_id": "2606.11781",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2606.11781"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:physics.flu-dyn",
      "subfield": "fluid-dynamics"
    }
  ],
  "title": "Geometry-induced self-excited dynamo in a regular tetrahedron",
  "title_text": "Geometry-induced self-excited dynamo in a regular tetrahedron",
  "type": "preprint",
  "updated_at": "2026-11-09T00:20:33Z",
  "url": "https://research.draconitic.com/paper/65f8nc59qr6sd",
  "venue": "arXiv",
  "versions": []
}