{
  "abstract": "We compare two identical two-level atoms coupled to a four-dimensional massless conformally coupled scalar field in three settings: comoving geodesics in the de Sitter Bunch–Davies vacuum, transversely separated uniformly accelerated trajectories in the Minkowski vacuum, and static trajectories in a Minkowski thermal bath. When $$a=H$$ a = H and $$\\beta =2\\pi /H,$$ β = 2 π / H , their local Wightman kernels and spectra agree in both the excitation and de-excitation sectors. At finite separation, the thermal cross spectrum contains a $$\\operatorname {sinc}(\\Omega L)$$ sinc ( Ω L ) factor, whereas the two vacuum settings share a hyperbolic geometric factor. At fixed nonzero gap, their large-distance spectral envelopes scale as $$L^{-1}$$ L - 1 and $$L^{-2},$$ L - 2 , respectively. For each fixed midpoint time T , the comoving de Sitter cross kernel equals the accelerated kernel with $$a=H$$ a = H and $$L=r(T).$$ L = r ( T ) . This equality concerns the full relative-time dependence at that midpoint; its Fourier transform is a Wigner-type cross spectrum and is not an instantaneous detector transition rate. We derive the corresponding negative-frequency spectra and express finite-time responses using smooth switching functions. Finite switching samples a range of midpoint times, so matching the two vacuum kernels at one midpoint does not generally match their cross responses over a measurement interval. These relations depend on the specified conformal scalar field and trajectory geometries.",
  "abstract_shown": true,
  "affiliations": [
    "Wuyi University"
  ],
  "article_type": null,
  "arxiv": null,
  "author_total": 1,
  "authors": [
    {
      "affs": [
        0
      ],
      "name": "Zhiming Huang",
      "orcid": "0000-0002-1956-4039"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/4wqdgc7c0t57j.bib",
  "cited_by": 0,
  "doi": "10.1140/epjc/s10052-026-16520-3",
  "fulltext_url": "https://doi.org/10.1140/epjc/s10052-026-16520-3",
  "id": "4wqdgc7c0t57j",
  "issns": [
    "1434-6044",
    "1434-6052"
  ],
  "landing_url": "https://link.springer.com/article/10.1140/epjc/s10052-026-16520-3",
  "language": "en",
  "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": [
    [
      "lcc",
      "QB460-466"
    ],
    [
      "lcc",
      "QC770-798"
    ],
    [
      "openalex",
      "3103|Cosmology and Gravitation Theories"
    ]
  ],
  "openalex": "W7204545501",
  "pdf_url": "https://link.springer.com/content/pdf/10.1140/epjc/s10052-026-16520-3.pdf",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-22",
  "publisher": "Springer Science and Business Media LLC",
  "ris": "https://research.draconitic.com/paper/4wqdgc7c0t57j.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:18:04Z",
      "native_id": "10.1140/epjc/s10052-026-16520-3",
      "source": "crossref",
      "url": "https://link.springer.com/article/10.1140/epjc/s10052-026-16520-3"
    },
    {
      "first_seen": "2026-10-30T13:46:24Z",
      "native_id": "84599db64e274a82972a244c6bd8cdc8",
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      "url": "https://doi.org/10.1140/epjc/s10052-026-16520-3"
    }
  ],
  "subjects": [
    {
      "field": "astronomy",
      "origin": "openalex:3103|Cosmology and Gravitation Theories",
      "subfield": "cosmology"
    }
  ],
  "title": "Comparison of two-atom cross spectra in de Sitter spacetime, uniformly accelerated Minkowski vacuum, and a thermal bath",
  "title_text": "Comparison of two-atom cross spectra in de Sitter spacetime, uniformly accelerated Minkowski vacuum, and a thermal bath",
  "type": "peer-reviewed",
  "updated_at": "2026-10-30T13:46:24Z",
  "url": "https://research.draconitic.com/paper/4wqdgc7c0t57j",
  "venue": "The European Physical Journal C",
  "versions": []
}