{
  "abstract": "We calculate finite-distance images of stationary, pressure-supported tori around genuine, electrically neutral Kerr--Bertotti--Robinson black holes using general relativistic ray tracing with gray emission and absorption. The emitting volume is bounded by a constant-specific-angular-momentum equilibrium free surface, and the observer is placed at a radius of $50M$. Along the investigated external-field sequence, integrated brightness and apparent size both increase strongly as the field modifies the equilibrium source and photon propagation. Higher torus filling has a different effect: in a representative sequence, brightness grows by a factor of $5.9$ while the intensity-weighted image size increases by only $10\\%$. Increasing viewing inclination enhances lateral brightness contrast. Stronger self-absorption can coexist with higher absolute brightness because emission and absorption scale together in the adopted gray prescription. At common pressure center and filling, increasing the dimensionless spin from $0.5$ to $0.95$ dims the retrograde sequence by a factor of about $7$ as its equilibrium contracts, whereas prograde brightness changes by only $2\\%$. These contrasting responses show how the equilibrium boundary, fluid motion, and optical depth jointly shape the brightness, scale, and asymmetry of finite-distance torus images.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2610.34331",
  "author_total": 3,
  "authors": [
    {
      "name": "Hao-Peng Yan"
    },
    {
      "name": "Xiang-Qian Li"
    },
    {
      "name": "Xiao-Jun Yue"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/3e3ycgek5688h.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2610.34331",
  "fulltext_url": null,
  "id": "3e3ycgek5688h",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2610.34331",
  "language": null,
  "licence": "CC-BY-4.0",
  "licence_label": "CC BY 4.0",
  "licence_source": "article",
  "licence_url": "http://creativecommons.org/licenses/by/4.0/",
  "metadata_licence": "CC0-1.0",
  "native_subjects": [
    [
      "arxiv",
      "gr-qc"
    ]
  ],
  "openalex": null,
  "pdf_url": "https://arxiv.org/pdf/2610.34331",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-25",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/3e3ycgek5688h.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:35:35Z",
      "native_id": "2610.34331",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2610.34331"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:gr-qc",
      "subfield": "gravitation"
    }
  ],
  "title": "Finite-Distance Imaging of Relativistic Equilibrium Tori around Genuine Kerr--Bertotti--Robinson Black Holes",
  "title_text": "Finite-Distance Imaging of Relativistic Equilibrium Tori around Genuine Kerr--Bertotti--Robinson Black Holes",
  "type": "preprint",
  "updated_at": "2026-10-30T12:35:35Z",
  "url": "https://research.draconitic.com/paper/3e3ycgek5688h",
  "venue": "arXiv",
  "versions": []
}