{
  "abstract": "We investigate black hole shadows and observational constraints on primary vector hair in an exact rotating solution of generalized Proca theory. Selecting a coupling slice yields a simple, one-parameter Kerr deformation that is noncircular and depends on spin and latitude. The deformation vanishes in the nonrotating limit, while the vector field remains nontrivial. We determine the domain admitting a regular outer horizon and construct shadow and lensing images by numerical ray tracing. Ray-traced images show a modest enlargement of the shadow and changes in the surrounding lensing pattern. Bayesian inference using the shadow area-equivalent radius and axis ratio yields joint constraints on hair, spin, and viewing inclination from Event Horizon Telescope observations of M87* and Sgr A*. The M87* posterior favors relatively low spin and exhibits a pronounced spin--hair anticorrelation, while Sgr A* yields upper limits on spin and hair with its inclination remaining essentially unconstrained. These results connect the optical signatures of primary vector hair to quantitative horizon-scale constraints.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2610.24996",
  "author_total": 2,
  "authors": [
    {
      "name": "Jiao-Zhen She"
    },
    {
      "name": "Shu-Min Wu"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/f0dt51h2szn1g.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2610.24996",
  "fulltext_url": null,
  "id": "f0dt51h2szn1g",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2610.24996",
  "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",
      "gr-qc"
    ],
    [
      "openalex",
      "3103|Astrophysical Phenomena and Observations"
    ]
  ],
  "openalex": "W7223045396",
  "pdf_url": "https://arxiv.org/pdf/2610.24996",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-18",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/f0dt51h2szn1g.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:30:52Z",
      "native_id": "2610.24996",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2610.24996"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:gr-qc",
      "subfield": "gravitation"
    }
  ],
  "title": "Bayesian Inference of Primary Hair from Black Hole Shadows in Generalized Proca Theory",
  "title_text": "Bayesian Inference of Primary Hair from Black Hole Shadows in Generalized Proca Theory",
  "type": "preprint",
  "updated_at": "2026-10-30T12:33:41Z",
  "url": "https://research.draconitic.com/paper/f0dt51h2szn1g",
  "venue": "arXiv",
  "versions": []
}