{
  "abstract": "A bstract : We revisit the resulting bispectrum of inflation with kinetic-coupled vector fields by organizing the dynamics in terms of h , which measures the vector kinetic contribution relative to that of the scalar field. We derive a low-energy effective field theory (EFT) and evaluate the bispectrum of the curvature perturbation for the large- h regime. For h ≫ 1, the entropic perturbation becomes heavy and can be integrated out; the remaining curvature mode has an imaginary sound speed and undergoes transient growth before horizon crossing. In contrast to the h ≪ 1 regime, where transfer from the vector sector persists outside the horizon and produces a local-type contribution enhanced as $${h}^{2}{N}_{K}^{3}$$ , we find that the bispectrum signals are controlled by the matching parameter x ≃ 1 . 63 Ah , where A < 1 is a numerical factor remaining dependent on the UV-to-EFT matching prescription. As a result, in addition to the known flattened-enhanced signals scaling as x ³ , a flattened-enhanced signal scaling as x ² and a pronounced local projection scaling as x are present. The bispectrum therefore distinguishes vector-supported inflationary dynamics even for an exactly isotropic background.",
  "abstract_shown": true,
  "affiliations": [
    "Nanchang University"
  ],
  "article_type": null,
  "arxiv": null,
  "author_total": 1,
  "authors": [
    {
      "affs": [
        0
      ],
      "name": "Chong-Bin Chen",
      "orcid": "0000-0001-7938-8922"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/0dmmeajg070sg.bib",
  "cited_by": 0,
  "doi": "10.1007/jhep10(2026)064",
  "fulltext_url": null,
  "id": "0dmmeajg070sg",
  "issns": [
    "1029-8479"
  ],
  "landing_url": "https://link.springer.com/10.1007/JHEP10(2026)064",
  "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",
      "3103|Cosmology and Gravitation Theories"
    ]
  ],
  "openalex": "W7162693772",
  "pdf_url": "https://link.springer.com/content/pdf/10.1007/JHEP10(2026)064.pdf",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-07",
  "publisher": "Springer Science and Business Media LLC",
  "ris": "https://research.draconitic.com/paper/0dmmeajg070sg.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:18:01Z",
      "native_id": "10.1007/jhep10(2026)064",
      "source": "crossref",
      "url": "https://link.springer.com/10.1007/JHEP10(2026)064"
    }
  ],
  "subjects": [
    {
      "field": "astronomy",
      "origin": "openalex:3103|Cosmology and Gravitation Theories",
      "subfield": "cosmology"
    }
  ],
  "title": "Inflation with vector fields revisited: non-Gaussianities",
  "title_text": "Inflation with vector fields revisited: non-Gaussianities",
  "type": "peer-reviewed",
  "updated_at": "2026-10-30T12:18:01Z",
  "url": "https://research.draconitic.com/paper/0dmmeajg070sg",
  "venue": "Journal of High Energy Physics",
  "versions": [
    {
      "doi": "10.48550/arxiv.2605.28752",
      "pid": "at8dy7p9rdjgp",
      "relation": "preprint",
      "title": "Inflation with vector fields revisited: non-Gaussianities",
      "venue": "arXiv"
    }
  ]
}