{
  "abstract": "We construct a new family of exact spherically symmetric solutions in $D$-dimensional Brans-Dicke theory with $n$ internal Ricci-flat spaces. The spacetime is assumed to be a product of a four-dimensional spherical sector and $n$ Ricci-flat internal manifolds. By performing a conformal transformation to the Einstein frame, the problem is reduced to Einstein gravity with a minimally coupled scalar field, for which the exact solution is already known. Applying the inverse transformation to the Jordan frame yields explicit expressions for the metric and the Brans-Dicke scalar field, together with a generalized algebraic constraint on the exponents. The obtained solutions generalize the four-dimensional Brans solutions and the multidimensional solutions with Ricci-flat internal spaces. We analyze the causal structure of the four-dimensional section and derive the necessary condition for the surface $R=L$ to be an event horizon, $ν\\equiv \\left|a+b+\\frac12\\sum_i a_iN_i\\right| \\ge 1$. A Kretschmann-scalar analysis shows that, apart from the Schwarzschild limit and the case of frozen internal spaces, a regular horizon is generically absent when the extra dimensions are dynamical. For the four-dimensional section we also obtain the photon-sphere and ISCO radii and discuss their Schwarzschild limits. The results clarify the role of nonminimal Brans-Dicke coupling in multidimensional black-hole geometries with Ricci-flat internal factors.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2611.01691",
  "author_total": 1,
  "authors": [
    {
      "name": "K. K. Ernazarov"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/bmbyja224cwfe.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2611.01691",
  "fulltext_url": null,
  "id": "bmbyja224cwfe",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2611.01691",
  "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": null,
  "pdf_url": "https://arxiv.org/pdf/2611.01691",
  "pmcid": null,
  "pmid": null,
  "published": "2026-11-01",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/bmbyja224cwfe.ris",
  "sources": [
    {
      "first_seen": "2026-11-03T12:20:59Z",
      "native_id": "2611.01691",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2611.01691"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:gr-qc",
      "subfield": "gravitation"
    }
  ],
  "title": "Spherically-symmetric solutions with internal Ricci-flat spaces in Brans-Dicke theory",
  "title_text": "Spherically-symmetric solutions with internal Ricci-flat spaces in Brans-Dicke theory",
  "type": "preprint",
  "updated_at": "2026-11-05T15:20:18Z",
  "url": "https://research.draconitic.com/paper/bmbyja224cwfe",
  "venue": "arXiv",
  "versions": []
}