{
  "abstract": "A bstract : We study static, spherically symmetric axion-dilaton solutions of the tree-level four-dimensional string effective action. Using the sigma-model structure of the scalar sector, we show that the full family of static, spherically symmetric and asymptotically flat solutions is obtained as the SL(2, ℝ ) orbit of the pure-dilaton FJNW solution, and we characterize the associated axion-dilaton charge space. We then analyze the perturbative regime of these solutions by comparing the onset of α ′ curvature corrections with that of string-loop corrections. Finally, we apply the string-black-hole correspondence criterion to the FJNW family by evaluating the local α ′ curvature diagnostic at the physical size R typ of a highly excited string state. With the normalization fixed on the Schwarzschild branch, Schwarzschild saturates the nominal α ′ threshold at the correspondence surface, whereas every scalar-haired FJNW branch lies above it. More generally, independently of the common overall normalization within the matching prescription, every nonzero-hair branch has a larger curvature diagnostic at the correspondence surface than Schwarzschild. Away from the correspondence point, scalar-haired exteriors may remain under α ′ control at sufficiently weak local self-gravity and may provide perturbatively controlled long-distance fields of highly excited string states whenever the local string coupling also remains weak.",
  "abstract_shown": true,
  "affiliations": [
    "Università di Bari",
    "Istituto Nazionale di Fisica Nucleare, Sezione di Bari"
  ],
  "article_type": null,
  "arxiv": null,
  "author_total": 1,
  "authors": [
    {
      "affs": [
        0,
        1
      ],
      "name": "E. Pavone",
      "orcid": "0000-0002-3022-4545"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/4tc3s4nn41qrh.bib",
  "cited_by": 0,
  "doi": "10.1007/jhep10(2026)158",
  "fulltext_url": null,
  "id": "4tc3s4nn41qrh",
  "issns": [
    "1029-8479"
  ],
  "landing_url": "https://link.springer.com/article/10.1007/JHEP10(2026)158",
  "language": null,
  "licence": "CC-BY-4.0",
  "licence_label": "CC BY 4.0",
  "licence_source": "article",
  "licence_url": "https://creativecommons.org/licenses/by/4.0",
  "metadata_licence": null,
  "native_subjects": [
    [
      "openalex",
      "3106|Black Holes and Theoretical Physics"
    ]
  ],
  "openalex": "W7201881359",
  "pdf_url": "https://link.springer.com/content/pdf/10.1007/JHEP10(2026)158.pdf",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-14",
  "publisher": "Springer Science and Business Media LLC",
  "ris": "https://research.draconitic.com/paper/4tc3s4nn41qrh.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:18:01Z",
      "native_id": "10.1007/jhep10(2026)158",
      "source": "crossref",
      "url": "https://link.springer.com/article/10.1007/JHEP10(2026)158"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "openalex:3106|Black Holes and Theoretical Physics",
      "subfield": "high-energy"
    }
  ],
  "title": "Scalar hair at the string-black-hole correspondence",
  "title_text": "Scalar hair at the string-black-hole correspondence",
  "type": "peer-reviewed",
  "updated_at": "2026-10-30T12:18:01Z",
  "url": "https://research.draconitic.com/paper/4tc3s4nn41qrh",
  "venue": "Journal of High Energy Physics",
  "versions": []
}