{
  "abstract": "We study the local canonical thermodynamics of the quantum Oppenheimer--Snyder (qOS) black-hole exterior previously obtained from loop quantum cosmology. The spacetime is adopted from the literature; no new black-hole solution, regular extension, or singularity-resolution mechanism is claimed here. At fixed quantum parameter $α$, we rewrite the outer horizon in a dimensionless form and obtain exact expressions for the mass, Hawking temperature, entropy, and heat capacity. These expressions reproduce the logarithmic entropy term and the heat-capacity divergence reported in earlier analyses. We then place those results in an explicit, regulated canonical-ensemble framework. The off-shell canonical action has a local minimum on a near-extremal branch with positive heat capacity and a local maximum on a large-black-hole branch with negative heat capacity. The two saddles merge at $r_h/\\sqrtα=\\sqrt{(4+2\\sqrt{7})/3}$, where the temperature is maximal and the heat capacity diverges. Because the asymptotically flat partition function is not normalizable without boundary data, this divergence is interpreted as a Davies-type local stability transition, not by itself as a global first-order phase transition. The principal contribution of this work is therefore a transparent canonical-saddle organization of known qOS thermodynamic results, together with a precise statement of its domain and limitations.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2609.13865",
  "author_total": 1,
  "authors": [
    {
      "name": "Wen-Xiang Chen"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/73erdrmxpshpt.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2609.13865",
  "fulltext_url": null,
  "id": "73erdrmxpshpt",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2609.13865",
  "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",
      "gr-qc"
    ],
    [
      "openalex",
      "3106|Black Holes and Theoretical Physics"
    ]
  ],
  "openalex": "W7213345254",
  "pdf_url": "https://arxiv.org/pdf/2609.13865",
  "pmcid": null,
  "pmid": null,
  "published": "2026-09-12",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/73erdrmxpshpt.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:21:25Z",
      "native_id": "2609.13865",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2609.13865"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:gr-qc",
      "subfield": "gravitation"
    }
  ],
  "title": "Canonical-Ensemble Stability of the Quantum Oppenheimer-Snyder Black-Hole Exterior",
  "title_text": "Canonical-Ensemble Stability of the Quantum Oppenheimer-Snyder Black-Hole Exterior",
  "type": "preprint",
  "updated_at": "2026-10-30T12:21:25Z",
  "url": "https://research.draconitic.com/paper/73erdrmxpshpt",
  "venue": "arXiv",
  "versions": []
}