{
  "abstract": "We study the double-copy structure of tree amplitudes of the bosonic null string in the flipped vacuum. We show that its level-one vector correlator supplies the Cachazo-He-Yuan (CHY) kinematic half-integrand of the higher-derivative $(DF)^2$ gauge theory, while distinguished compact momentum-winding sectors generate the complementary Parke-Taylor factor. For factorized level-two states, the same Carrollian world-sheet produces two kinematic half-integrands and hence the symmetric double copy to the six-derivative Weyl-cubed graviton sector. Lattice sectors with common external momenta reproduce the Bern-Carrasco-Johansson (BCJ) ordering relation and the corresponding field-theory Kawai-Lewellen-Tye (KLT) representation. These results provide a direct Carrollian world-sheet origin of the double copy and point toward a current-algebra realization of the emergent color sector compatible with the $O(d,d)$ structure of the compact lattice.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2609.07846",
  "author_total": 5,
  "authors": [
    {
      "name": "Arjun Bagchi"
    },
    {
      "name": "Sachin Grover"
    },
    {
      "name": "Sharang Rajesh Iyer"
    },
    {
      "name": "Amartya Saha"
    },
    {
      "name": "Stephan Stieberger"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/73x2zehf9ewh5.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2609.07846",
  "fulltext_url": null,
  "id": "73x2zehf9ewh5",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2609.07846",
  "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",
      "hep-th"
    ],
    [
      "openalex",
      "3106|Black Holes and Theoretical Physics"
    ]
  ],
  "openalex": "W7211995561",
  "pdf_url": "https://arxiv.org/pdf/2609.07846",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-05",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/73x2zehf9ewh5.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:27:01Z",
      "native_id": "2609.07846",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2609.07846"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:hep-th",
      "subfield": "high-energy"
    }
  ],
  "title": "Double Copy from the Flipped Null String",
  "title_text": "Double Copy from the Flipped Null String",
  "type": "preprint",
  "updated_at": "2026-10-30T12:27:01Z",
  "url": "https://research.draconitic.com/paper/73x2zehf9ewh5",
  "venue": "arXiv",
  "versions": []
}