{
  "abstract": "A bstract : Boruch, Emparan, Iliesiu, and Murthy recently discussed index saddles for 5D black strings, showing that the black string saddle admits a decoupling limit to a complex, finite-temperature BTZ × S ² saddle that computes the index of the dual CFT. In this paper, we pursue an analogous construction for the D1-D5-P black string. We construct a four-charge index saddle in the four-dimensional STU model as the BPS limit of the non-extremal four-charge black hole, and show that it exhibits the new form of attraction. We then uplift it successively to five and six dimensions, via the 4D-5D connection and a chain of string dualities, to obtain the gravitational index saddle for the D1-D5-P black string. We take a systematic decoupling limit of this index saddle and obtain the BTZ × S ³ saddle that computes the index of the D1-D5 CFT.",
  "abstract_shown": true,
  "affiliations": [
    "Chennai Mathematical Institute",
    "International Centre for Theoretical Sciences, TIFR"
  ],
  "article_type": null,
  "arxiv": null,
  "author_total": 3,
  "authors": [
    {
      "affs": [
        0
      ],
      "name": "Kanhu Kishore Nanda",
      "orcid": "0000-0002-2802-1896"
    },
    {
      "affs": [
        1
      ],
      "name": "P. Shanmugapriya",
      "orcid": "0000-0002-6936-5767"
    },
    {
      "affs": [
        0
      ],
      "name": "Amitabh Virmani",
      "orcid": "0000-0001-7701-4839"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/74fexpq6txq9y.bib",
  "cited_by": 0,
  "doi": "10.1007/jhep10(2026)123",
  "fulltext_url": null,
  "id": "74fexpq6txq9y",
  "issns": [
    "1029-8479"
  ],
  "landing_url": "https://link.springer.com/10.1007/JHEP10(2026)123",
  "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"
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  "openalex": "W7166399679",
  "pdf_url": "https://link.springer.com/content/pdf/10.1007/JHEP10(2026)123.pdf",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-12",
  "publisher": "Springer Science and Business Media LLC",
  "ris": "https://research.draconitic.com/paper/74fexpq6txq9y.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:18:01Z",
      "native_id": "10.1007/jhep10(2026)123",
      "source": "crossref",
      "url": "https://link.springer.com/10.1007/JHEP10(2026)123"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "openalex:3106|Black Holes and Theoretical Physics",
      "subfield": "high-energy"
    }
  ],
  "title": "Index saddle for the D1-D5-P black string and its decoupling limit",
  "title_text": "Index saddle for the D1-D5-P black string and its decoupling limit",
  "type": "peer-reviewed",
  "updated_at": "2026-10-30T12:18:01Z",
  "url": "https://research.draconitic.com/paper/74fexpq6txq9y",
  "venue": "Journal of High Energy Physics",
  "versions": [
    {
      "doi": "10.48550/arxiv.2606.27093",
      "pid": "31hr6s57kn5t9",
      "relation": "preprint",
      "title": "Index saddle for the D1-D5-P black string and its decoupling limit",
      "venue": "arXiv"
    }
  ]
}