{
  "abstract": "Recently, it has been observed that in certain schemes of the bosonic string effective action, the non-derivative tachyon appears only in the tachyon potential, while all other couplings involve covariant derivatives of the tachyon and massless fields. Within these schemes, a minimal basis can be found whose coupling constants are constrained by T-duality upon circle reduction. Using this constraint, one obtains sets of couplings at each order of \\(α'\\) that are invariant under Buscher rules supplemented by higher-derivative corrections for all base-space fields except the tachyon. In this paper, we observe that consistency of these T-dual sets with S-matrix elements requires an appropriate field redefinition, such that each set becomes invariant under Buscher rules supplemented by higher-derivative corrections for all base-space fields except the metric, dilaton, and tachyon. This separates the couplings into a massless sector and a tachyon sector. We determine the six-derivative couplings in the massless sector, with all coupling constants fixed, and find two T-dual couplings in the tachyon sector with arbitrary coupling constants. We show that the leading-order action and the massless-sector couplings exactly reproduce the expansion of the sphere-level S-matrix element of two tachyons and two massless vertex operators at six-momentum order, and that the coupling constant of the four-tachyon coupling in the tachyon sector is fixed by the expansion of the four-tachyon S-matrix element at six-momentum order.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2610.38364",
  "author_total": 1,
  "authors": [
    {
      "name": "Mohammad R. Garousi"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/5wqt0v21t3q1a.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2610.38364",
  "fulltext_url": null,
  "id": "5wqt0v21t3q1a",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2610.38364",
  "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",
      "hep-th"
    ]
  ],
  "openalex": null,
  "pdf_url": "https://arxiv.org/pdf/2610.38364",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-28",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/5wqt0v21t3q1a.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:36:23Z",
      "native_id": "2610.38364",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2610.38364"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:hep-th",
      "subfield": "high-energy"
    }
  ],
  "title": "Tachyon and massless sectors of the bosonic string effective action",
  "title_text": "Tachyon and massless sectors of the bosonic string effective action",
  "type": "preprint",
  "updated_at": "2026-11-01T12:20:44Z",
  "url": "https://research.draconitic.com/paper/5wqt0v21t3q1a",
  "venue": "arXiv",
  "versions": []
}