{
  "abstract": "We analyze the structure of the baby universe which arises in the coupled SYK realization of the AS$^2$ geometry. To do this, we develop and leverage combinatorial arguments about traces of many Majoranas which remain valid at finite $N$ and $p$ and thus furnish the finite $λ$ completion of the chord rules found in [1]. We find that there is a first order phase transition which persists in the $β\\rightarrow\\infty$ limit between the thermal AdS and AS$^2$ phases parameterized by the mass of the heavy particle insertion and the ratio between the SYK and Maldacena-Qi coupling constants. We then explore Lorentzian time evolution in the baby universe and find a cosine scale factor confirming the big bang / big crunch nature of the bulk cosmology.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2610.36032",
  "author_total": 1,
  "authors": [
    {
      "name": "Andrew Sontag"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/8jscb6t772fqy.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2610.36032",
  "fulltext_url": null,
  "id": "8jscb6t772fqy",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2610.36032",
  "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",
      "hep-th"
    ],
    [
      "openalex",
      "3106|Black Holes and Theoretical Physics"
    ]
  ],
  "openalex": "W7224130052",
  "pdf_url": "https://arxiv.org/pdf/2610.36032",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-26",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/8jscb6t772fqy.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:35:50Z",
      "native_id": "2610.36032",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2610.36032"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:hep-th",
      "subfield": "high-energy"
    }
  ],
  "title": "Cosmology of the Baby Universe in Coupled SYK",
  "title_text": "Cosmology of the Baby Universe in Coupled SYK",
  "type": "preprint",
  "updated_at": "2026-10-30T12:35:50Z",
  "url": "https://research.draconitic.com/paper/8jscb6t772fqy",
  "venue": "arXiv",
  "versions": []
}