{
  "abstract": "This paper derives the finite-inertia intrinsic thermal bispectrum in potential-free warm $k$-inflation with nonminimal derivative coupling (NMDC). On a fixed Friedmann--Lema\\^ıtre--Robertson--Walker geometry, the complete cubic inflaton action determines the nonlinear stochastic source, encompassing temporal, spatial-gradient, and field-dependent kinetic interactions. The retarded solution captures the full momentum-triangle dependence while retaining unequal-time correlations, whereas its equilateral limit yields the intrinsic nonlinearity parameter. The power spectrum is computed with the same response and Gaussian initial state, thereby fixing the statistical normalization. A complementary local freeze-out reduction makes the interaction coefficients and two geometric shape contributions explicit. Comparison along an evolving near-attractor trajectory indicates that unequal-time finite-inertia propagation is crucial for quantitatively predicting the intrinsic bispectrum. The analysis also derives the slow-roll-suppressed nonlinear $δN$ conversion, together with the Arnowitt--Deser--Misner constraints and cubic vertices that characterize the direct gravitational effects of NMDC. These results clarify the respective roles of local freeze-out estimates and finite-inertia stochastic evolution in the nonlinear prediction.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2611.07492",
  "author_total": 6,
  "authors": [
    {
      "name": "Xiao-Min Zhang"
    },
    {
      "name": "Zi-Xin Bai"
    },
    {
      "name": "Qing-Ze Shi"
    },
    {
      "name": "Run-Qing Zhao"
    },
    {
      "name": "Peng-Cheng Chu"
    },
    {
      "name": "Yun-Cai Feng"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/0e139kk4jcr0a.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2611.07492",
  "fulltext_url": null,
  "id": "0e139kk4jcr0a",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2611.07492",
  "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",
      "gr-qc"
    ],
    [
      "arxiv",
      "hep-th"
    ]
  ],
  "openalex": null,
  "pdf_url": "https://arxiv.org/pdf/2611.07492",
  "pmcid": null,
  "pmid": null,
  "published": "2026-11-05",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/0e139kk4jcr0a.ris",
  "sources": [
    {
      "first_seen": "2026-11-06T18:21:30Z",
      "native_id": "2611.07492",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2611.07492"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:gr-qc",
      "subfield": "gravitation"
    },
    {
      "field": "physics",
      "origin": "arxiv:hep-th",
      "subfield": "high-energy"
    }
  ],
  "title": "Primordial non-Gaussianity in warm $k$-inflation with nonminimal derivative coupling",
  "title_text": "Primordial non-Gaussianity in warm k-inflation with nonminimal derivative coupling",
  "type": "preprint",
  "updated_at": "2026-11-09T00:20:41Z",
  "url": "https://research.draconitic.com/paper/0e139kk4jcr0a",
  "venue": "arXiv",
  "versions": []
}