{
  "abstract": "A bstract : It is now common to describe classical backgrounds involving dynamical black holes with the production of gravitational radiation using the methods of scattering amplitudes. In that light, we revisit the standard formulation of quantum field theory on a background. We discuss the interpretation of Bogoliubov coefficients as generalised amplitudes, and explain how crossing, analyticity, and causality relate the relevant set of amplitudes. When the background is itself a coherent state, we map these statements onto standard results in flat-space quantum field theory.",
  "abstract_shown": true,
  "affiliations": [
    "The University of Edinburgh",
    "Institut des Hautes Études Scientifiques"
  ],
  "article_type": null,
  "arxiv": null,
  "author_total": 5,
  "authors": [
    {
      "affs": [
        0
      ],
      "name": "Rafael Aoude",
      "orcid": "0000-0001-9259-9257"
    },
    {
      "affs": [
        0,
        1
      ],
      "name": "Asaad Elkhidir",
      "orcid": "0009-0008-6092-2804"
    },
    {
      "affs": [
        0
      ],
      "name": "Anton Ilderton",
      "orcid": "0000-0002-6520-7323"
    },
    {
      "affs": [
        0
      ],
      "name": "Donal O’Connell",
      "orcid": "0000-0001-8886-6391"
    },
    {
      "affs": [
        0
      ],
      "name": "Karthik Rajeev",
      "orcid": "0000-0003-3193-1900"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/9kbnw7j0a0hna.bib",
  "cited_by": 0,
  "doi": "10.1007/jhep11(2026)015",
  "fulltext_url": null,
  "id": "9kbnw7j0a0hna",
  "issns": [
    "1029-8479"
  ],
  "landing_url": "https://link.springer.com/article/10.1007/JHEP11(2026)015",
  "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": null,
  "pdf_url": "https://link.springer.com/content/pdf/10.1007/JHEP11(2026)015.pdf",
  "pmcid": null,
  "pmid": null,
  "published": "2026-11-02",
  "publisher": "Springer Science and Business Media LLC",
  "ris": "https://research.draconitic.com/paper/9kbnw7j0a0hna.ris",
  "sources": [
    {
      "first_seen": "2026-11-04T12:20:54Z",
      "native_id": "10.1007/jhep11(2026)015",
      "source": "crossref",
      "url": "https://link.springer.com/article/10.1007/JHEP11(2026)015"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "issn:1029-8479",
      "subfield": "high-energy"
    }
  ],
  "title": "The ABCs of amplitudes, Bogoliubov and crossing",
  "title_text": "The ABCs of amplitudes, Bogoliubov and crossing",
  "type": "peer-reviewed",
  "updated_at": "2026-11-06T00:20:57Z",
  "url": "https://research.draconitic.com/paper/9kbnw7j0a0hna",
  "venue": "Journal of High Energy Physics",
  "versions": []
}