{
  "abstract": "We extend the recently proposed modified double-copy formalism to quasitopological gravity (QTG) coupled to matter. For spherically symmetric configurations, the QTG field equations in $D-$dimensional curved spacetime with a broad class of matter sources are mapped to equations for an auxiliary nonlinear gauge field in a flat $(D+1)$-dimensional spacetime. The nonlinear electrodynamics governing this auxiliary field is determined entirely by the generating function $h(p)$ that specifies the QTG model, while the corresponding current is determined by the matter stress-energy tensor. Restricting the auxiliary solution to a $D$-dimensional hyperplane and applying the modified double-copy prescription yields the Kerr--Schild metric solving the QTG equations. We show that Maxwell and nonlinear electrodynamics, as well as a broad class of spherically symmetric Yang--Mills fields, provide physical matter sources compatible with this construction. In the absence of null-matter fluxes, the corresponding solutions possess an additional Killing vector. This means that they satisfy a generalized Birkhoff theorem, whereas null charged currents naturally generate Vaidya-type solutions. In the Einstein limit, $h(p)=p$, the auxiliary nonlinear electrodynamics reduces to Maxwell theory.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2608.12596",
  "author_total": 1,
  "authors": [
    {
      "name": "Valeri P. Frolov"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/anxv5yva0qqvv.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2608.12596",
  "fulltext_url": null,
  "id": "anxv5yva0qqvv",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2608.12596",
  "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"
    ],
    [
      "arxiv",
      "hep-th"
    ],
    [
      "openalex",
      "3106|Black Holes and Theoretical Physics"
    ]
  ],
  "openalex": "W7203502646",
  "pdf_url": "https://arxiv.org/pdf/2608.12596",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-07",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/anxv5yva0qqvv.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:27:54Z",
      "native_id": "2608.12596",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2608.12596"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:gr-qc",
      "subfield": "gravitation"
    },
    {
      "field": "physics",
      "origin": "arxiv:hep-th",
      "subfield": "high-energy"
    }
  ],
  "title": "Quasitopological Gravity with Matter: Modified Double-Copy Approach",
  "title_text": "Quasitopological Gravity with Matter: Modified Double-Copy Approach",
  "type": "preprint",
  "updated_at": "2026-10-30T12:27:54Z",
  "url": "https://research.draconitic.com/paper/anxv5yva0qqvv",
  "venue": "arXiv",
  "versions": []
}