{
  "abstract": "{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 $h\\gg1$, 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 $h\\ll1$ regime, where transfer from the vector sector persists outside the horizon and produces a local-type contribution enhanced as $h^2N_K^3$, we find that the bispectrum signals are controlled by the matching parameter $x\\simeq1.63Ah$, 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": [],
  "article_type": "Journal reference: JHEP 10 (2026) 064",
  "arxiv": "2605.28752",
  "author_total": 1,
  "authors": [
    {
      "name": "Chong-Bin Chen"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/at8dy7p9rdjgp.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2605.28752",
  "fulltext_url": null,
  "id": "at8dy7p9rdjgp",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2605.28752",
  "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",
      "astro-ph.CO"
    ],
    [
      "arxiv",
      "gr-qc"
    ],
    [
      "arxiv",
      "hep-th"
    ]
  ],
  "openalex": null,
  "pdf_url": "https://arxiv.org/pdf/2605.28752",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-08",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/at8dy7p9rdjgp.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:27:53Z",
      "native_id": "2605.28752",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2605.28752"
    }
  ],
  "subjects": [
    {
      "field": "astronomy",
      "origin": "arxiv:astro-ph.CO",
      "subfield": "cosmology"
    },
    {
      "field": "physics",
      "origin": "arxiv:gr-qc",
      "subfield": "gravitation"
    },
    {
      "field": "physics",
      "origin": "arxiv:hep-th",
      "subfield": "high-energy"
    }
  ],
  "title": "Inflation with vector fields revisited: non-Gaussianities",
  "title_text": "Inflation with vector fields revisited: non-Gaussianities",
  "type": "preprint",
  "updated_at": "2026-10-30T12:27:53Z",
  "url": "https://research.draconitic.com/paper/at8dy7p9rdjgp",
  "venue": "arXiv",
  "versions": [
    {
      "doi": "10.1007/jhep10(2026)064",
      "pid": "0dmmeajg070sg",
      "relation": "published-as",
      "title": "Inflation with vector fields revisited: non-Gaussianities",
      "venue": "Journal of High Energy Physics"
    }
  ]
}