{
  "abstract": "Jackiw-Teitelboim (JT) gravity with positive cosmological constant is a toy model to study the emergence of expanding de Sitter universes from a quantum state. Its density matrix is a superposition of double-trumpet amplitudes which are solutions of a Wheeler-DeWitt equation. We compare predictions of such mixed states for classical expanding universes with the corresponding predictions of no-boundary wavefunctions. Double-trumpet amplitudes consistent with holography, whose semiclassical limit matches the result from Schwarzian boundary fluctuations, lead to a flat probability distribution for the size of the universe, consistent with models of inflation. This is in contrast to the suppression of large universes predicted by no-boundary wave functions.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2610.12174",
  "author_total": 2,
  "authors": [
    {
      "name": "Wilfried Buchmuller"
    },
    {
      "name": "Alexander Westphal"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/1z9jkv10be6dk.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2610.12174",
  "fulltext_url": null,
  "id": "1z9jkv10be6dk",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2610.12174",
  "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",
      "hep-th"
    ],
    [
      "openalex",
      "3109|Noncommutative and Quantum Gravity Theories"
    ]
  ],
  "openalex": "W7221198967",
  "pdf_url": "https://arxiv.org/pdf/2610.12174",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-17",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/1z9jkv10be6dk.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:30:52Z",
      "native_id": "2610.12174",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2610.12174"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:hep-th",
      "subfield": "high-energy"
    }
  ],
  "title": "Probability measures for de Sitter JT gravity",
  "title_text": "Probability measures for de Sitter JT gravity",
  "type": "preprint",
  "updated_at": "2026-10-30T12:33:41Z",
  "url": "https://research.draconitic.com/paper/1z9jkv10be6dk",
  "venue": "arXiv",
  "versions": []
}